1
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Zidan ASA, Mosbah HK, Aly AAM, Ibrahim ABM, Mayer P, Saber SH. Synthesis, X-ray structure and anticancer activity evaluation of a binuclear La(III) complex with anthranilic acid. Nat Prod Res 2024; 38:1414-1423. [PMID: 36408968 DOI: 10.1080/14786419.2022.2148246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 11/07/2022] [Accepted: 11/08/2022] [Indexed: 11/23/2022]
Abstract
A binuclear La(III) complex {[La2(HA)4(H2O)4(C2H5OH)2Cl2]Cl4 (C1)} with 2-aminobenzoic acid (HA) was prepared from the ligand and heptahydrated lanthanum chloride. The complex was characterised by X-ray crystallography that revealed anti-prismatic geometry around both of the lanthanum. In the complex, the four 2-aminobenzoic acid ligands are zwitter ionic and the two lanthanum(III) ions net charge is only counterbalanced by chloride ions. The complex cytotoxicity was determined against human breast (MDA-MB-231), prostate (PC-3) and bladder (T-24) cancer cells. This complex afforded cytotoxicity towards the T-24 bladder cancer cells with an IC50 value of 383.5 µg/mL (319 µM). In contrary, activities by the lanthanum complex with IC50 values of 1124 µg/mL (934 µM) and 739 µg/mL (614 µM) were, respectively, shown against the MDA-MB-231 and PC-3 cancer cells. This means the complex is more cytotoxic against the T-24 cells, despite that its activity is less compared with activities shown by classical drugs.
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Affiliation(s)
- Amna S A Zidan
- Department of Chemistry, Faculty of Science, Assiut University, Assiut, Egypt
| | - Hanan K Mosbah
- Department of Chemistry, Faculty of Science, Assiut University, Assiut, Egypt
| | - Aref A M Aly
- Department of Chemistry, Faculty of Science, Assiut University, Assiut, Egypt
| | - Ahmed B M Ibrahim
- Department of Chemistry, Faculty of Science, Assiut University, Assiut, Egypt
| | - Peter Mayer
- Department Chemie, Ludwig-Maximilians-Universität München, München, Germany
| | - Saber H Saber
- Laboratory of Molecular Cell Biology, Department of Zoology, Faculty of Science, Assiut University, Assiut, Egypt
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2
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Steinborn C, Huber T, Lichtenegger J, Plangger I, Höfler D, Schnell SD, Weisheit L, Mayer P, Wurst K, Magauer T. Synthesis of Waixenicin A: Exploring Strategies for Nine-Membered Ring Formation. Chemistry 2024; 30:e202303489. [PMID: 37942708 PMCID: PMC7615592 DOI: 10.1002/chem.202303489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 11/07/2023] [Accepted: 11/08/2023] [Indexed: 11/10/2023]
Abstract
We present a comprehensive account on our efforts behind the recently published synthesis of waixenicin A. Our approach for constructing the dihydropyran ring relied on an Achmatowicz rearrangement. For the assembly of the nine-membered ring, four distinct strategies were investigated. Our initial attempts using radical-based addition/fragmentation reactions targeting the C7-C11 bond proved unsuitable for accessing the 6/9-bicycle. By employing anionic fragmentation conditions at the furfuryl alcohol stage, we successfully reached a 5/9-bicycle. However, subsequent ring-expansion was unsuccessful. Alternative approaches, such as Nozaki-Hiyama-Kishi or Heck reactions to connect the C6-C7 bond, also encountered difficulties, with no nine-membered ring formation observed. Our first breakthrough came from our attempts to install the C5-C6 bond via an intramolecular alkylation. Surprisingly, subsequent functional group modifications proved unexpectedly challenging, necessitating a redesign of our synthetic route. Drawing from all our investigations, we concluded that construction of the C9-C10 bond would enable efficient nine-membered ring alkylation and would facilitate the installation of the desired substitution pattern along the southern periphery. Exploration of this strategy yielded further surprises but ultimately led to the successful synthesis of waixenicin A and 9-deacetoxy-14,15-deepoxyxeniculin. For the latter compound, a bioinspired one-step rearrangement to xeniafauranol A was achieved.
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Affiliation(s)
- Christian Steinborn
- Institute of Organic Chemistry and Center for Molecular Biosciences, University of Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria
| | - Tatjana Huber
- Department of Chemistry and Pharmacy, Ludwig-Maximilians-University Munich, Butenandtstrasse 5-13, 81377, Munich, Germany
| | - Julian Lichtenegger
- Institute of Organic Chemistry and Center for Molecular Biosciences, University of Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria
| | - Immanuel Plangger
- Institute of Organic Chemistry and Center for Molecular Biosciences, University of Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria
| | - Denis Höfler
- Institute of Organic Chemistry and Center for Molecular Biosciences, University of Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria
| | - Simon D Schnell
- Department of Chemistry and Pharmacy, Ludwig-Maximilians-University Munich, Butenandtstrasse 5-13, 81377, Munich, Germany
| | - Lara Weisheit
- Department of Chemistry and Pharmacy, Ludwig-Maximilians-University Munich, Butenandtstrasse 5-13, 81377, Munich, Germany
| | - Peter Mayer
- Department of Chemistry and Pharmacy, Ludwig-Maximilians-University Munich, Butenandtstrasse 5-13, 81377, Munich, Germany
| | - Klaus Wurst
- Institute of General, Inorganic & Theoretical Chemistry, University of Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria
| | - Thomas Magauer
- Institute of Organic Chemistry and Center for Molecular Biosciences, University of Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria
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3
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Stockerl WJ, Reißenweber L, Gerwien A, Bach NN, Thumser S, Mayer P, Gschwind RM, Dube H. Azotriptycenes: Photoswitchable Molecular Brakes. Chemistry 2024; 30:e202302267. [PMID: 37779321 DOI: 10.1002/chem.202302267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Revised: 09/24/2023] [Accepted: 09/27/2023] [Indexed: 10/03/2023]
Abstract
The control of molecular motions is a central topic of molecular machine research. Molecular brakes are fundamental building blocks towards such goal as they allow deliberately decelerating specific motions after an outside stimulus is applied. Here we present azotriptycenes as structural framework for light-controlled molecular brakes. The intrinsic kinetics and their changes upon azotriptycene isomerization are scrutinized comprehensively by a mixed theoretical and variable temperature NMR approach. With azotriptycenes C-N bond rotation rates can be decelerated or accelerated reversibly by up to five orders of magnitude. Rate change effects are highly localized and are strongest for the C-N bond connecting a triptycene rotor fragment to the central diazo group. The detailed mechanistic insights provide a solid basis for further conscious design and applications in the future.
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Affiliation(s)
- Willibald J Stockerl
- Institut für Organische Chemie, Universität Regensburg, Universitätsstr. 31, 93053, Regensburg, Germany
| | - Lilli Reißenweber
- Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058, Erlangen, Germany
| | - Aaron Gerwien
- Department of Chemistry and Center for Integrated Protein Science CIPSM, Ludwig-Maximilians Universität München, Butenandtstr. 5-13, 81377, Munich, Germany
| | - Nicolai N Bach
- Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058, Erlangen, Germany
| | - Stefan Thumser
- Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058, Erlangen, Germany
| | - Peter Mayer
- Department of Chemistry and Center for Integrated Protein Science CIPSM, Ludwig-Maximilians Universität München, Butenandtstr. 5-13, 81377, Munich, Germany
| | - Ruth M Gschwind
- Institut für Organische Chemie, Universität Regensburg, Universitätsstr. 31, 93053, Regensburg, Germany
| | - Henry Dube
- Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058, Erlangen, Germany
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4
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Köttner L, Wolff F, Mayer P, Zanin E, Dube H. Rhodanine-Based Chromophores: Fast Access to Capable Photoswitches and Application in Light-Induced Apoptosis. J Am Chem Soc 2024; 146:1894-1903. [PMID: 38207286 DOI: 10.1021/jacs.3c07710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
Molecular photoswitches are highly desirable in all chemistry-related areas of research. They provide effective outside control over geometric and electronic changes at the nanoscale using an easy to apply, waste-free stimulus. However, simple and effective access to such molecular tools is typically not granted, and elaborate syntheses and substitution schemes are needed in order to obtain efficient photoswitching properties. Here we present a series of rhodanine-based photoswitches that can be prepared in one simple synthetic step without requiring elaborate purification. Photoswitching is induced by UV and visible light in both switching directions, and thermal stabilities of the metastable states as well as quantum yields are very high. An additional benefit is the hydrogen-bonding capacity of the rhodanine fragment, which enables applications in supramolecular or medicinal chemistry. We further show that the known rhodanine-based inhibitor SMI-16a is a photoswitchable apoptosis inducer. The biological activity of SMI-16a can effectively be switched ON or OFF by reversible photoisomerization between the inactive E and the active Z isomer. Rhodanine-based photoswitches therefore represent an easy to access and highly valuable molecular toolbox for implementing light responsiveness to the breadth of functional molecular systems.
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Affiliation(s)
- Laura Köttner
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Straße 10, 91058 Erlangen, Germany
| | - Friederike Wolff
- Department of Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 5, 91058 Erlangen, Germany
| | - Peter Mayer
- Department of Chemistry and Munich Center for Integrated Protein Science CIPSM, Ludwig-Maximilians-Universität München, D-81377 Munich, Germany
| | - Esther Zanin
- Department of Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 5, 91058 Erlangen, Germany
| | - Henry Dube
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Straße 10, 91058 Erlangen, Germany
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5
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Vogl LS, Mayer P, Robiette R, Waser M. Chiral Isochalcogenourea-Catalysed Enantioselective (4+2) Cycloadditions of Allenoates. Angew Chem Int Ed Engl 2024; 63:e202315345. [PMID: 38010747 PMCID: PMC10952905 DOI: 10.1002/anie.202315345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/13/2023] [Accepted: 11/27/2023] [Indexed: 11/29/2023]
Abstract
Allenoates are versatile building blocks which are primarily activated and controlled using chiral tert. phosphine and tert. amine Lewis bases. We herein report the first example of allenoate activation by using chiral isochalcogenoureas (IChU) for formal (4+2) cycloaddition reactions. Compared to established phosphine and amine catalysis, the use of these easily available Lewis bases enables new stereoselective reaction pathways proceeding with high enantioselectivities, diastereoselectivities, and in good yields. In addition, the factors governing enantioselectivity and the origin of the observed differences compared to other commonly used Lewis bases are explained.
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Affiliation(s)
- Lukas S. Vogl
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstrasse 694040LinzAustria
| | - Peter Mayer
- Department ChemieLudwig-Maximilians-Universität MünchenButenandtstraße 5–1381377MünchenGermany
| | - Raphaël Robiette
- Institute of Condensed Matter and NanosciencesUniversité catholique de LouvainPlace Louis Pasteur 1 box L4.01.021348Louvain-la-NeuveBelgium
| | - Mario Waser
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstrasse 694040LinzAustria
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6
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Zidan ASA, Ibrahim ABM, Aly AAM, Mosbah HK, Mayer P, Saber SH. Synthesis, Solid State Structure, and Cytotoxic Activity of a Complex Dimer of Yttrium with Anthranilic Acid against Cancer Cells. Biol Trace Elem Res 2023; 201:4688-4696. [PMID: 36602747 PMCID: PMC10415499 DOI: 10.1007/s12011-022-03545-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 12/23/2022] [Indexed: 01/06/2023]
Abstract
This paper presents the synthesis and isolation of a new binuclear complex of yttrium with anthranilic acid (HA). The complex [Y2(HA)6(H2O)4] Cl6.2C2H5OH (C1) was obtained as single crystals that its X-ray analysis revealed its triclinic P-1 space group in addition to anti-prismatic geometry around each of the yttrium ions. In the complex, the anthranilic acid ligands are bidentate, zwitter ionic and neutral, and the yttrium ions' charge is only compensated by six chloride ions. The cytotoxicity of this complex against human breast cancer MDA-MB-231 cells, prostate cancer PC-3 cells, and bladder cancer T-24 cells was evaluated. This yttrium complex displayed more cytotoxic activity against the bladder cancer cells with an IC50 value of 307.7 μg/ml (223 μM). On the other hand, the activities of complex C1 against the MDA-MB-231 and PC-3 cells were less significant respectively with IC50 values of 1097 μg/ml (796 μM) and 921 μg/ml (669 μM).
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Affiliation(s)
- Amna S A Zidan
- Department of Chemistry, Faculty of Science, Assiut University, Assiut, 71516, Egypt
| | - Ahmed B M Ibrahim
- Department of Chemistry, Faculty of Science, Assiut University, Assiut, 71516, Egypt.
| | - Aref A M Aly
- Department of Chemistry, Faculty of Science, Assiut University, Assiut, 71516, Egypt
| | - Hanan K Mosbah
- Department of Chemistry, Faculty of Science, Assiut University, Assiut, 71516, Egypt
| | - Peter Mayer
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, Haus, D 81377, München, Germany
| | - Saber H Saber
- Laboratory of Molecular Cell Biology, Department of Zoology, Faculty of Science, Assiut University, Assiut, 71516, Egypt
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7
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Mahmoud GAE, Mayer P, Gaber DA, Ibrahim AB. Response to oxidative stress generation in Rhodotorula glutinis and Candida tropicalis by thallium dithiocarbamate complexes. INORG CHEM COMMUN 2023; 156:111283. [DOI: 10.1016/j.inoche.2023.111283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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8
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Regen-Pregizer BL, Ozcelik A, Mayer P, Hampel F, Dube H. A photochemical method to evidence directional molecular motions. Nat Commun 2023; 14:4595. [PMID: 37524701 PMCID: PMC10390485 DOI: 10.1038/s41467-023-40190-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 07/17/2023] [Indexed: 08/02/2023] Open
Abstract
Light driven synthetic molecular motors represent crucial building blocks for advanced molecular machines and their applications. A standing challenge is the development of very fast molecular motors able to perform rotations with kHz, MHz or even faster frequencies. Central to this challenge is the direct experimental evidence of directionality because analytical methods able to follow very fast motions rarely deliver precise geometrical insights. Here, a general photochemical method for elucidation of directional motions is presented. In a macrocyclization approach the molecular motor rotations are restricted and forced to proceed in two separate ~180° rotation-photoequilibria. Therefore, all four possible photoinduced rotation steps (clockwise and counterclockwise directions) can be quantified. Comparison of the corresponding quantum yields to the unrestricted motor delivers direct evidence for unidirectionality. This method can be used for any ultrafast molecular motor even in cases where no high energy intermediates are present during the rotation cycle.
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Affiliation(s)
- Benjamin Lukas Regen-Pregizer
- Friedrich-Alexander Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Str. 10, 91058, Erlangen, Germany
| | - Ani Ozcelik
- Friedrich-Alexander Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Str. 10, 91058, Erlangen, Germany
| | - Peter Mayer
- Ludwig-Maximilians Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstr. 5-13, 81377, Munich, Germany
| | - Frank Hampel
- Friedrich-Alexander Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Str. 10, 91058, Erlangen, Germany
| | - Henry Dube
- Friedrich-Alexander Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Str. 10, 91058, Erlangen, Germany.
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9
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Fischer T, Leitner J, Gerwien A, Mayer P, Dreuw A, Dube H, Wachtveitl J. Mechanistic Elucidation of the Hula-Twist Photoreaction in Hemithioindigo. J Am Chem Soc 2023. [PMID: 37364887 DOI: 10.1021/jacs.3c03536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
The Hula-Twist (HT) photoreaction represents a fundamental photochemical pathway for bond isomerizations and is defined by the coupled motion of a double bond and an adjacent single bond. This photoreaction has been suggested as the defining motion for a plethora of light-responsive chromophores such as retinal within opsins, coumaric acid within photoactive yellow protein, or vitamin D precursors, and stilbenes in solution. However, due to the fleeting character of HT photoproducts a direct experimental observation of this coupled molecular motion was severely hampered until recently. To solve this dilemma, the Dube group has designed a molecular framework able to deliver unambiguous experimental evidence of the HT photoreaction. Using sterically crowded atropisomeric hemithioindigo (HTI) the HT photoproducts are rendered thermally stable and can be observed directly after their formation. However, following the ultrafast excited state process of the HT photoreaction itself has not been achieved so far and thus crucial information for an elementary understanding is still missing. In this work, we present the first ultrafast spectroscopy study of the HT photoreaction in HTI and probe the competition between different excited state processes. Together with extensive excited state calculations a detailed mechanistic picture is developed explaining the significant solvent effects on the HT photoreaction and revealing the intricate interplay between productive isomerizations and unproductive twisted intramolecular charge transfer (TICT) processes. With this study essential insights are thus gained into the mechanism of complex multibond rotations in the excited state, which will be of primary importance for further developments in this field.
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Affiliation(s)
- Tobias Fischer
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue Straße 7, 60438 Frankfurt, Germany
| | - Jonas Leitner
- Interdisciplinary Center for Scientific Computing, Ruprecht-Karls University Heidelberg, Im Neuenheimer Feld 205, 69120 Heidelberg, Germany
| | - Aaron Gerwien
- Department of Chemistry and Center for Integrated Protein Science CIPSM, Ludwig-Maximilians Universität München, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Peter Mayer
- Department of Chemistry and Center for Integrated Protein Science CIPSM, Ludwig-Maximilians Universität München, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Andreas Dreuw
- Interdisciplinary Center for Scientific Computing, Ruprecht-Karls University Heidelberg, Im Neuenheimer Feld 205, 69120 Heidelberg, Germany
| | - Henry Dube
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg, Nikolaus-Fiebiger Straße 10, 91058 Erlangen, Germany
| | - Josef Wachtveitl
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt am Main, Max-von-Laue Straße 7, 60438 Frankfurt, Germany
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Mayer P, Werner K, Al-Radhi M, Csapo TG, Czeba B, Nemeth G, Rocha AP, Oliveira IC, Silva S, Szeker M, Teixeira A, Panek P. Concept and Pictogram-Based User-Interface Design of a Helper Tool for People with Aphasia. Stud Health Technol Inform 2023; 301:77-82. [PMID: 37172157 DOI: 10.3233/shti230016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
BACKGROUND Aphasia describes the lack of the already gained ability to use language in a common way. "Language" here covers all variations of forming or understanding messages. OBJECTIVES The APH-Alarm project aims to develop a service concept that provides alternative communication options for people with Aphasia to trigger timely help when needed. It considers that a typical user may not be familiar with modern technologies and offers several simple and intuitive options. METHODS The approach is based on event detection of gestures (during daytime or in bed), movement pattern recognition in bed, and an easy-to-use pictogram-based smartphone app. RESULTS Agile evaluation of the smartphone app showed a promising outcome. CONCLUSION The idea of a versatile and comprehensive solution for aphasic people to easily contact private or public helpers based on their actions or automatic detection is promising and will be further investigated in an upcoming field trial.
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Affiliation(s)
- Peter Mayer
- Applied Assistive Technologies Group, HCI Group, TU Wien, Vienna, Austria
| | - Katharina Werner
- Applied Assistive Technologies Group, HCI Group, TU Wien, Vienna, Austria
| | - Mohammed Al-Radhi
- Department of Telecommunications and Media Informatics, Budapest University of Technology and Economics, Budapest, Hungary
| | - Tamas Gabor Csapo
- Department of Telecommunications and Media Informatics, Budapest University of Technology and Economics, Budapest, Hungary
| | | | - Géza Nemeth
- Department of Telecommunications and Media Informatics, Budapest University of Technology and Economics, Budapest, Hungary
| | - Ana Patrícia Rocha
- Institute of Electronics and Informatics Engineering of Aveiro, Department of Electronics, Telecommunications and Informatics, Intelligent Systems Associate Laboratory, University of Aveiro, Aveiro, Portugal
| | - Ilídio C Oliveira
- Institute of Electronics and Informatics Engineering of Aveiro, Department of Electronics, Telecommunications and Informatics, Intelligent Systems Associate Laboratory, University of Aveiro, Aveiro, Portugal
| | - Samuel Silva
- Institute of Electronics and Informatics Engineering of Aveiro, Department of Electronics, Telecommunications and Informatics, Intelligent Systems Associate Laboratory, University of Aveiro, Aveiro, Portugal
| | | | - António Teixeira
- Institute of Electronics and Informatics Engineering of Aveiro, Department of Electronics, Telecommunications and Informatics, Intelligent Systems Associate Laboratory, University of Aveiro, Aveiro, Portugal
| | - Paul Panek
- Applied Assistive Technologies Group, HCI Group, TU Wien, Vienna, Austria
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11
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Panek P, Mayer P. Light as a Possible Guidance in the Toilet Room from the View of Dementia Experts. Stud Health Technol Inform 2023; 301:225-226. [PMID: 37172185 DOI: 10.3233/shti230044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Digital assistants and guidance systems may support persons with dementia (PwD) during the independent use of the toilet room. The paper investigates the possible use of different light sources to provide visual stimuli for guidance. Demonstrators were presented to dementia experts to gather their views. While there is no evidence yet, it can be concluded that light stimuli in the toilet environment could be a (maybe only additional) option for guidance to be further investigated. The different methods must be always adapted to the local situation and the individual user characteristics.
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Affiliation(s)
- Paul Panek
- Applied Assistive Technologies Group, HCI Group, TU Wien, Vienna, Austria
| | - Peter Mayer
- Applied Assistive Technologies Group, HCI Group, TU Wien, Vienna, Austria
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12
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Arya V, Page A, Mayer P, Vijayakumar L, Shin S, Pirkis J, Armstrong G. Insights from use of police data for suicide surveillance in India: An interim step toward suicide surveillance in low- and middle-income countries. Journal of Affective Disorders Reports 2023. [DOI: 10.1016/j.jadr.2023.100500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
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13
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Evers J, Beck W, Oehlinger G, Mayer P, Völkl MBR, Klapötke TM, Zimina A, Wolf S, Köppe R. Cover Feature: PdCl(NO) – an iconic compound with corrugated Pd
4
Cl
4
octagons built up by Pd
2
Cl
2
(NO)
2
moieties (Z. Anorg. Allg. Chem. 6‐7/2023). Z Anorg Allg Chem 2023. [DOI: 10.1002/zaac.202300041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Affiliation(s)
- Jürgen Evers
- Department Chemie der Ludwig-Maximilians-Universität Butenandtstraße 5–13 D-81377 München Deutschland
| | - Wolfgang Beck
- Department Chemie der Ludwig-Maximilians-Universität Butenandtstraße 5–13 D-81377 München Deutschland
| | - Gilbert Oehlinger
- Department Chemie der Ludwig-Maximilians-Universität Butenandtstraße 5–13 D-81377 München Deutschland
| | - Peter Mayer
- Department Chemie der Ludwig-Maximilians-Universität Butenandtstraße 5–13 D-81377 München Deutschland
| | | | - Thomas Matthias Klapötke
- Department Chemie der Ludwig-Maximilians-Universität Butenandtstraße 5–13 D-81377 München Deutschland
| | - Anna Zimina
- Karlsruher Institut für Technologie (KIT) Institut für Katalyseforschung und -technologie (IKFT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Deutschland
| | - Silke Wolf
- Karlsruher Institut für Technologie (KIT) Institut für Anorganische Chemie Engesserstraße 15 D-76131 Karlsruhe Deutschland
| | - Ralf Köppe
- Karlsruher Institut für Technologie (KIT) Institut für Anorganische Chemie Engesserstraße 15 D-76131 Karlsruhe Deutschland
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14
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Mazzoni F, Alvisi S, Blokker M, Buchberger SG, Castelletti A, Cominola A, Gross MP, Jacobs HE, Mayer P, Steffelbauer DB, Stewart RA, Stillwell AS, Tzatchkov V, Yamanaka VHA, Franchini M. Investigating the characteristics of residential end uses of water: A worldwide review. Water Res 2023; 230:119500. [PMID: 36640613 DOI: 10.1016/j.watres.2022.119500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 12/14/2022] [Accepted: 12/15/2022] [Indexed: 06/17/2023]
Abstract
A detailed characterization of residential water consumption is essential for ensuring urban water systems' capability to cope with changing water resources availability and water demands induced by growing population, urbanization, and climate change. Several studies have been conducted in the last decades to investigate the characteristics of residential water consumption with data at a sufficiently fine temporal resolution for grasping individual end uses of water. In this paper, we systematically review 114 studies to provide a comprehensive overview of the state-of-the-art research about water consumption at the end-use level. Specifically, we contribute with: (1) an in-depth discussion of the most relevant findings of each study, highlighting which water end-use characteristics were so far prioritized for investigation in different case studies and water demand modelling and management studies from around the world; and (2) a multi-level analysis to qualitatively and quantitatively compare the most common results available in the literature, i.e. daily per capita end-use water consumption, end-use parameter average values and statistical distributions, end-use daily profiles, end-use determinants, and considerations about efficiency and diffusion of water-saving end uses. Our findings can support water utilities, consumers, and researchers (1) in understanding which key aspects of water end uses were primarily investigated in the last decades; and (2) in exploring their main features considering different geographical, cultural, and socio-economic regions of the world.
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Affiliation(s)
- Filippo Mazzoni
- PhD Student, Department of Engineering, University of Ferrara, Via Saragat 1, Ferrara 44124, Italy.
| | - Stefano Alvisi
- Associate Professor, Department of Engineering, University of Ferrara, Via Saragat 1, Ferrara 44124, Italy
| | - Mirjam Blokker
- Senior Researcher and Lecturer, TU Delft, Faculty of Civil Engineering and Geosciences, Stevinweg 1, Delft, CN 2628, The Netherlands; PhD, KWR Water Research Institute, Groningenhaven 7, Nieuwegein, PE 3433, The Netherlands
| | - Steven G Buchberger
- Professor, Civil and Architecture Engineering and Construction Management Department, University of Cincinnati, 765 Baldwin Hall, 2850 Campus Way Drive, Cincinnati, OH 45221-0071, United States
| | - Andrea Castelletti
- Professor, Department of Electronics, Information, and Bioengineering, Politecnico di Milano, Piazza Leonardo da Vinci, 32, Milano 20133, Italy
| | - Andrea Cominola
- Assistant Professor, Chair of Smart Water Networks, Technische Universität Berlin, Straße des 17 Juni 135,, Berlin 10623, Germany; Einstein Center Digital Future, Wilhelmstraße 67, Berlin 10117, Germany
| | - Marie-Philine Gross
- Einstein Center Digital Future, Wilhelmstraße 67, Berlin 10117, Germany; Research Assistant, Chair of Smart Water Networks, Technische Universität Berlin, Straße des 17 Juni 135, Berlin 10623, Germany
| | - Heinz E Jacobs
- Associate Professor, Department of Civil Engineering, Stellenbosch University, Bosman Street, Stellenbosch 7599, South Africa
| | - Peter Mayer
- Water DM Principal and Founder, Water Demand Management LLC, 1339 Hawthorn Avenue, Boulder, CO 80304-2212, United States
| | - David B Steffelbauer
- Group Leader Hydroinformatics, Department of Urban Systems, Kompetenzzentrum Wasser Berlin, Cicerostr. 24, Berlin 10709, Germany
| | - Rodney A Stewart
- Professor, School of Engineering and Built Environment, Griffith University, 1 Parklands Dr, Southport QLD 4215, Australia
| | - Ashlynn S Stillwell
- Associate Professor, Department of Civil and Environmental Engineering, University of Illinois Urbana-Champaign, 205N Mathews Ave, MC-250, Urbana, IL 61801, United States
| | - Velitchko Tzatchkov
- Mexican Institute of Water Technology, Paseo Cuauhnáhuac 8532, Colonia Progreso, Jiutepec, Morelos Mexico
| | - Victor-Hugo Alcocer Yamanaka
- Professor, National Autonomous University of Mexico, Avenida Universidad 3004, Copilco Universidad, Coyoacán, Ciudad de México, Mexico
| | - Marco Franchini
- Professor, Department of Engineering, University of Ferrara, Via Saragat 1, Ferrara 44124, Italy
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15
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Graf M, Ochs J, Metzler‐Nolte N, Mayer P, Böttcher H. Synthesis, Characterization and Cytotoxic Activities of Half‐sandwich Pentamethylcyclopentadienyl Iridium(III) Complexes Containing 4,4'‐substituted 2,2'‐Bipyridine Ligands. Z Anorg Allg Chem 2023. [DOI: 10.1002/zaac.202200382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Marion Graf
- Department Chemie Ludwig-Maxim010ilians-Universität Butenandtstrasse 5–13 D 81377 München Germany
| | - Jasmine Ochs
- Faculty for Chemistry and Biochemistry Chair of Inorganic Chemistry I – Bioinorganic Chemistry Ruhr University Bochum Universitätsstrasse 150 44801 Bochum Germany
| | - Nils Metzler‐Nolte
- Faculty for Chemistry and Biochemistry Chair of Inorganic Chemistry I – Bioinorganic Chemistry Ruhr University Bochum Universitätsstrasse 150 44801 Bochum Germany
| | - Peter Mayer
- Department Chemie Ludwig-Maxim010ilians-Universität Butenandtstrasse 5–13 D 81377 München Germany
| | - Hans‐Christian Böttcher
- Department Chemie Ludwig-Maxim010ilians-Universität Butenandtstrasse 5–13 D 81377 München Germany
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16
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Bahrani-Pour M, Beheshti A, Sedaghat T, Hoveizi E, Naseri N, Mayer P, Centore R. New Hg(II) coordination polymers based on a thioimidazole ligand with good performance to detoxify Hg(II) and reversibly capture iodine. Dalton Trans 2023; 52:683-695. [PMID: 36541208 DOI: 10.1039/d2dt03057h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In the current paper, we have successfully synthesized three new mercury coordination polymers with fascinating structures and properties via a flexible sulfur donor ligand, namely, {[Hg(μ2-Cl)(μ2-Ls)]}n[BF4]n(1), {[Hg(μ2-Cl)(μ2-Ls)]}n[ClO4]n(2), and [Hg(SCN)2(μ2-Ls)]n(3) [Ls = 1,1-bis(3-methyl-4-imidazoline-2-thione)methane]. These complexes have been characterized by means of different techniques such as single crystal X-ray crystallography, FT-IR, elemental analysis (CHNS), UV-Vis, PXRD, BET, and TGA. Suitable single crystals of all complexes were obtained using the branch tube method with a very high yield and good stability due to the high affinity of mercury to bind to the thione groups. The cationic moieties of polymers 1 and 2 were isostructural, with a HgCl2S2 coordination core structure. The voids of the quasi-hexagonal packing of the columnar chains were occupied by unbonded tetrahedral BF4- ions in 1 and perchlorate anions in polymer 2. Polymer 3 has a less distorted tetrahedral geometry than 1 and 2, with a HgS4 core structure. By considering the thiophilicity of mercury, a thioamide-based Ls ligand was used to detoxify Hg(II) into insoluble polymers 1-3. The results of an MTT assay for (HepG2) liver cells confirmed the excellent cytoprotective effect of this ligand against mercury. Based on IC50 calculations, their toxicity was in order of polymer 1 > polymer 2 > polymer 3. These polymers were also considered as adsorbents for the reversible removal of iodine from solution and the kinetics of the process has been studied in detail. Interestingly, all of them showed an excellent stability and high capacity, in order of 763.53 mg g-1, 877.10 mg g-1, and 905.31 mg g-1 for polymers 1-3, respectively.
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Affiliation(s)
- Maryam Bahrani-Pour
- Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, 6135783151 Ahvaz, Iran.
| | - Azizolla Beheshti
- Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, 6135783151 Ahvaz, Iran.
| | - Tahereh Sedaghat
- Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, 6135783151 Ahvaz, Iran.
| | - Elham Hoveizi
- Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, 6135783151 Ahvaz, Iran
| | - Nadieh Naseri
- Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, 6135783151 Ahvaz, Iran.
| | - Peter Mayer
- Department of Chemie Butenandtstr, LMU München University, 5-13 (D) 81377 München, Germany
| | - Roberto Centore
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia, I-80126 Naples, Italy
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17
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Bahrani‐Pour M, Beheshti A, Naseri N, Maleki Q, Mayer P, Abrahams CT, Centore R. Synthesis, structural characterization of new group 12 metal ions coordination polymers built on sulfur‐based ligand and probing
their high
iodine
adsorption efficiency
in micro and bulk forms. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Maryam Bahrani‐Pour
- Department of Chemistry, Faculty of Science Shahid Chamran University of Ahvaz 6135783151 Ahvaz Iran
| | - Azizolla Beheshti
- Department of Chemistry, Faculty of Science Shahid Chamran University of Ahvaz 6135783151 Ahvaz Iran
| | - Nadieh Naseri
- Department of Chemistry, Faculty of Science Shahid Chamran University of Ahvaz 6135783151 Ahvaz Iran
| | - Qasem Maleki
- Department of Chemistry, Faculty of Science Shahid Chamran University of Ahvaz 6135783151 Ahvaz Iran
| | - Peter Mayer
- Department of Chemie Butenandtstr LMU München University 5‐13 (D)81377 München Germany
| | - Carmel T. Abrahams
- Department of Chemistry La Trobe University Bundoora Victoria 3086 Australia
| | - Roberto Centore
- Department of Chemical Sciences University of Naples Federico II Via Cintia I‐80126 Naples Italy
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18
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Daumann LJ, Janßen R, Vetsova VA, Putz D, Mayer P. Modular Synthesis of New Pyrroloquinoline Quinone Derivatives. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/s-0041-1738426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
AbstractPyrroloquinoline quinone (PQQ) is an important cofactor of methanol dehydrogenases and glycose dehydrogenases. In addition, isolated PQQ is used as a central component in sensors and biomimetic complexes. The synthesis of PQQ derivatives is of interest for developing new alcohol oxidation catalysts and redox sensors. This work describes a modular synthesis for derivatives of PQQ bearing methyl and ketone groups instead of carboxylic acid moieties. These modifications reduce the possible coordination sites of PQQ for metal ions outside the protein environment.
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19
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Li L, Mayer RJ, Stephenson DS, Mayer P, Ofial AR, Mayr H. Quantification of the Electrophilicities of Diazoalkanes: Kinetics and Mechanism of Azo Couplings with Enamines and Sulfonium Ylides. Chemistry 2022; 28:e202201376. [PMID: 35758555 DOI: 10.1002/chem.202201376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Indexed: 01/07/2023]
Abstract
Kinetics and mechanism of the reactions of methyl diazoacetate, dimethyl diazomalonate, 4-nitrophenyldiazomethane, and diphenyldiazomethane with sulfonium ylides and enamines were investigated by UV-Vis and NMR spectroscopy. Ordinary alkenes undergo 1,3-dipolar cycloadditions with these diazo compounds. In contrast, sulfonium ylides and enamines attack at the terminal nitrogen of the diazo alkanes to give zwitterions, which undergo various subsequent reactions. As only one new bond is formed in the rate-determining step of these reactions, the correlation lg k2 (20 °C)=sN (N+E) could be used to determine the one-bond electrophilicities E of the diazo compounds from the measured second-order rate constants and the known reactivity indices N and sN of the sulfonium ylides and enamines. The resulting electrophilicity parameters (-21<E<-18), which are 11-14 orders of magnitude smaller than that of the benzenediazonium ion, are used to define the scope of one-bond nucleophiles which may react with these diazoalkanes.
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Affiliation(s)
- Le Li
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, München, Germany
| | - Robert J Mayer
- Institut des Science et d'Ingénierie Supramoléculaires (ISIS), Université de Strasbourg & CNRS, 8 Allée Gaspard Monge, 67000, Strasbourg, France
| | - David S Stephenson
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, München, Germany
| | - Peter Mayer
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, München, Germany
| | - Armin R Ofial
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, München, Germany
| | - Herbert Mayr
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, München, Germany
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20
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Beheshti A, Hashemi F, Setayeshizadeh S, Mousavifard ES, Solymani-babadi S, Mayer P. High capacity for selective adsorption of anionic pollutants by a silver(I) 3D cationic supramolecular constructed from a flexible dithione ligand. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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21
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Li L, Mayer P, Ofial AR, Mayr H. Cyclobutane Formation by the Reaction of Ethenesulfonyl Fluoride with Dimethyl Diazomalonate. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Le Li
- Ludwig-Maximilians-Universitat Munchen Dept. Chemie GERMANY
| | - Peter Mayer
- Ludwig-Maximilians-Universitat Munchen Dept. Chemie GERMANY
| | - Armin R. Ofial
- Ludwig-Maximilians-Universitat Munchen Dept. Chemie GERMANY
| | - Herbert Mayr
- Ludwig-Maximilians-Universität München Fakultät für Chemie und Pharmazie: Ludwig-Maximilians-Universitat Munchen Fakultat fur Chemie und Pharmazie Dept. Chemie Butenandtstr. 5-13 81377 München GERMANY
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22
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Mayer P, Panek P. Design Considerations for Novel Self-Adapting Toilets for Semi-Public Spaces. Stud Health Technol Inform 2022; 293:119-120. [PMID: 35592970 DOI: 10.3233/shti220357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
People with physical limitations face significant challenges when using existing toilets. User requirements work shows the wide range of user needs and confirms the high demand for innovative toilets, enabling people to leave home more often and participate more in societal life. The Toilet For Me too (T4ME2) project aims to implement and test a new ICT-based toilet system capable of physically supporting users, allowing autonomous and safe use outside the home.
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Affiliation(s)
- Peter Mayer
- Applied Assistive Technologies Group, HCI Group, TU Wien, Vienna, Austria
| | - Paul Panek
- Applied Assistive Technologies Group, HCI Group, TU Wien, Vienna, Austria
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23
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Graf M, Böttcher HC, Czerwieniec R, Mayer P, Thavalingam S, Metzler-Nolte N. Photophysical and structural characterization of the bis-cyclometalated compound [Ir(ptpy)2(κ2N-tppz)]PF6 and evaluation of its cytotoxic activity. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.120806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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24
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Graf M, Böttcher H, Mayer P, Metzler‐Nolte N, Thavalingam S, Czerwieniec R. Cytotoxic Activities of Bis‐cyclometalated Iridium(III) Complexes Containing Chloro‐substituted κ
2
N‐terpyridines. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Marion Graf
- Department Chemie Ludwig-Maximilians-Universität Butenandtstrasse 5–13 (D) 1377 München Germany
| | - Hans‐Christian Böttcher
- Department Chemie Ludwig-Maximilians-Universität Butenandtstrasse 5–13 (D) 1377 München Germany
| | - Peter Mayer
- Department Chemie Ludwig-Maximilians-Universität Butenandtstrasse 5–13 (D) 1377 München Germany
| | - Nils Metzler‐Nolte
- Faculty for Chemistry and Biochemistry Chair of Inorganic Chemistry I – Bioinorganic Chemistry Ruhr University Bochum Universitätsstrasse 150 44801 Bochum Germany
| | - Sugina Thavalingam
- Faculty for Chemistry and Biochemistry Chair of Inorganic Chemistry I – Bioinorganic Chemistry Ruhr University Bochum Universitätsstrasse 150 44801 Bochum Germany
| | - Rafał Czerwieniec
- Institute of Physical and Theoretical Chemistry University Regensburg Universitätsstrasse 31 3053 Regensburg Germany
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25
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Beheshti A, Bahrani-Pour M, Samiee S, Mayer P. Impact of coordination ability of the selected anions on tuning the structure of Hg(II) complexes constructed from a neutral dithione ligand: iodine uptake and DFT theoretical studies. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.120969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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26
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Li L, Mayer P, Stephenson DS, Ofial AR, Mayer RJ, Mayr H. An Overlooked Pathway in 1,3‐Dipolar Cycloadditions of Diazoalkanes with Enamines. Angew Chem Int Ed Engl 2022; 61:e202117047. [PMID: 35023245 PMCID: PMC9306659 DOI: 10.1002/anie.202117047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Indexed: 11/25/2022]
Abstract
Methyl diazoacetate reacts with 1‐(N‐pyrrolidino)cycloalkenes to give products of 1,3‐dipolar cycloadditions and azo couplings. The kinetics and mechanisms of these reactions were investigated by NMR spectroscopy and DFT calculations. Orthogonal π‐systems in the 1,3‐dipoles of the propargyl‐allenyl type allow for two separate reaction pathways for the (3+2)‐cycloadditions. The commonly considered concerted pathway is rationalized by the interaction of the enamine HOMO with LUMO+1, the lowest unoccupied orbital of the heteropropargyl anion fragment of methyl diazoacetate. We show that HOMO/LUMO(π*N=N) interactions between enamines and methyl diazoacetate open a previously unrecognized reaction path for stepwise cycloadditions through zwitterionic intermediates with barriers approximately 40 kJ mol−1 lower in energy in CHCl3 (DFT calculations) than for the concerted path.
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Affiliation(s)
- Le Li
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstraße 5–13 81377 München Germany
| | - Peter Mayer
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstraße 5–13 81377 München Germany
| | - David S. Stephenson
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstraße 5–13 81377 München Germany
| | - Armin R. Ofial
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstraße 5–13 81377 München Germany
| | - Robert J. Mayer
- Institut de Science et d'Ingénierie Supramoléculaires (ISIS) Université de Strasbourg & CNRS 8 Allée Gaspard Monge 67000 Strasbourg France
| | - Herbert Mayr
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstraße 5–13 81377 München Germany
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27
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Abstract
![]()
Typical photoswitches
interconvert between two different states
by simple isomerization reactions, which represents a fundamental
limit for applications. To expand the switching capacity usually different
photoswitches have to be linked together leading to strong increase
in molecular weight, diminished switching function, and less precision
and selectivity of switching events. Herein we present an approach
for solving this essential problem with a different photoswitching
concept. A basic molecular switch architecture provides precision
photoswitching between eight different states via controlled rotations
around three adjacent covalent bonds. All eight states can be populated
one after another in an eight-step cycle by alternating between photochemical
Hula-Twist isomerizations and thermal single-bond rotations. By simply
changing solvent and temperature the same switch can also undergo
a different cycle instead interconverting just five isomers in a selective
sequence. This behavior is enabled through the discovery of an unprecedented
photoreaction, a one-photon dual single-bond rotation.
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Affiliation(s)
- Aaron Gerwien
- Ludwig-Maximilians Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstrasse 5-13, 81377 Munich, Germany
| | - Benjamin Jehle
- Ludwig-Maximilians Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstrasse 5-13, 81377 Munich, Germany
| | - Marvin Irmler
- Ludwig-Maximilians Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstrasse 5-13, 81377 Munich, Germany
| | - Peter Mayer
- Ludwig-Maximilians Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstrasse 5-13, 81377 Munich, Germany
| | - Henry Dube
- Friedrich-Alexander Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany
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28
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Kohl F, Gerwien A, Hampel F, Mayer P, Dube H. Hemithioindigo-Based Trioxobicyclononadiene: 3D Multiswitching of Electronic and Geometric Properties. J Am Chem Soc 2022; 144:2847-2852. [PMID: 35157795 PMCID: PMC8874893 DOI: 10.1021/jacs.1c12364] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
![]()
Molecular photoswitches
that offer simultaneous precise control
over geometrical and electronic changes are rare yet highly sought
tools for the development of responsive nanosystems. Here we present
such an advantageous combination of property control within a novel
multiphotoswitch architecture. Hemithioindigo-based trioxobicyclononadiene
(HTI-TOND) offers a rigid three-dimensional molecular structure that
undergoes different exotic rearrangement reactions upon photochemical
and thermal signaling. Three to four different states with distinct
geometric and electronic properties can be accessed reversibly in
high yields within this molecular framework. Thus, a highly promising
and unique switching tool has become available to instill the next
level of addressability at the smallest scales.
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Affiliation(s)
- Fabien Kohl
- Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Aaron Gerwien
- Department of Chemistry and Center for Integrated Protein Science (CIPSM), Ludwig-Maximilians Universität München, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Frank Hampel
- Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Peter Mayer
- Department of Chemistry and Center for Integrated Protein Science (CIPSM), Ludwig-Maximilians Universität München, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Henry Dube
- Department of Chemistry and Pharmacy, Friedrich-Alexander Universität Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
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29
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Kirst C, Tietze J, Mayer P, Böttcher HC, Karaghiosoff K. Coinage Metal Complexes of Bis(quinoline-2-ylmethyl)phenylphosphine-Simple Reactions Can Lead to Unprecedented Results. Chemistry 2022; 11:e202100224. [PMID: 35146971 PMCID: PMC8889507 DOI: 10.1002/open.202100224] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 01/31/2022] [Indexed: 12/13/2022]
Abstract
The different coordination behavior of the flexible yet sterically demanding, hemilabile P,N ligand bis(quinoline‐2‐ylmethyl)phenylphosphine (bqmpp) towards selected CuI, AgI and AuI species is described. The resulting X‐ray crystal structures reveal interesting coordination geometries. With [Cu(MeCN)4]BF4, compound 1 [Cu2(bqmpp)2](BF4)2 is obtained, wherein the copper(I) atoms display a distorted square planar and square pyramidal geometry. The steric demand and π‐stacking of the ligand allow for a short Cu⋅⋅⋅Cu distance (2.588(9) Å). CuI complex 2 [Cu4Cl3(bqmpp)2]BF4 contains a rarely observed Cu4Cl3 cluster, probably enabled by dichloromethane as the chloride source. In the cluster, even shorter Cu⋅⋅⋅Cu distances (2.447(1) Å) are present. The reaction of Ag[SbF6] with the ligand leads to a dinuclear compound (3) in solution as confirmed by 31P{1H} NMR spectroscopy. During crystallization, instead of the expected phosphine complex 3, a tris(quinoline‐2‐ylmethyl)bisphenyl‐phosphine (tqmbp) compound [Ag2(tqmbp)2](SbF6)24 is formed by elimination of quinaldine. The Au(I) compound [Au2(bqmpp)2]PF6 (5) is prepared as expected and shows a linear arrangement of two phosphine ligands around AuI.
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Affiliation(s)
- Christin Kirst
- Department of Chemistry, Ludwig-Maximilians University of Munich, Butenandtstr. 5-13, (D) 81377, Munich, Germany
| | - Jonathan Tietze
- Department of Chemistry, Ludwig-Maximilians University of Munich, Butenandtstr. 5-13, (D) 81377, Munich, Germany
| | - Peter Mayer
- Department of Chemistry, Ludwig-Maximilians University of Munich, Butenandtstr. 5-13, (D) 81377, Munich, Germany
| | - Hans-Christian Böttcher
- Department of Chemistry, Ludwig-Maximilians University of Munich, Butenandtstr. 5-13, (D) 81377, Munich, Germany
| | - Konstantin Karaghiosoff
- Department of Chemistry, Ludwig-Maximilians University of Munich, Butenandtstr. 5-13, (D) 81377, Munich, Germany
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Li L, Mayer P, Stephenson DS, Ofial AR, Mayer RJ, Mayr H. An Overlooked Pathway in 1,3‐Dipolar Cycloadditions of Diazoalkanes with Enamines. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202117047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Le Li
- Ludwig-Maximilians-Universitat Munchen Fakultat fur Chemie und Pharmazie Dept. Chemie GERMANY
| | - Peter Mayer
- Ludwig-Maximilians-Universitat Munchen Fakultat fur Chemie und Pharmazie Dept. Chemie GERMANY
| | - David S. Stephenson
- Ludwig-Maximilians-Universitat Munchen Fakultat fur Chemie und Pharmazie Dept. Chemie GERMANY
| | - Armin R. Ofial
- Ludwig-Maximilians-Universitat Munchen Fakultat fur Chemie und Pharmazie Dept. Chemie GERMANY
| | - Robert J. Mayer
- Université de Strasbourg: Universite de Strasbourg Institut de Science et d'Ingenierie Supramoleculaire (ISIS) FRANCE
| | - Herbert Mayr
- Ludwig-Maximilians-Universität München Fakultät für Chemie und Pharmazie: Ludwig-Maximilians-Universitat Munchen Fakultat fur Chemie und Pharmazie Dept. Chemie Butenandtstr. 5-13 81377 München GERMANY
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31
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Soleymani-Babadi S, Beheshti A, Nasiri E, Bahrani-Pour M, Motamedi H, Mayer P. Simple synthesis of novel magnetic silver polymer nanocomposites with a good separation capacity and intrinsic antibacterial activities with high performance. Dalton Trans 2021; 50:15538-15550. [PMID: 34651632 DOI: 10.1039/d1dt00176k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Two new coordination polymers namely, [(AgCN)4LS]n (1) and [(AgCN)3LN]n (2), were successfully synthesized by the reaction of AgNO3 and cyanide as a co-anion with LS[1,1'-(hexane-1,4-diyl)bis(3-methylimidazoline-2-thione] and LN[1,1,3,3-tetrakis(3,5-dimethyl-1-pyrazole)propane] ligands in order to use them for the preparation of magnetic nanocomposites with MnFe2O4 nanoparticles by an efficient and facile method. They were then well characterized via numerous techniques, including elemental analysis, FT-IR spectroscopy, TGA, PXRD, SEM, TEM, EDX, VSM, BET, ICP, and single-crystal X-ray diffraction. The considered polymers and their magnetic nanocomposites with nearly the same antibacterial activity demonstrated a highly inhibitive effect on the growth of Gram-negative (Escherichia coli, Pseudomonas aeruginosa) and Gram-positive (Staphylococcus aureus, Bacillus subtilis) bacteria. By considering the simple separation and recyclable characters of the magnetic nanocomposites, these materials are suitable to be used in biological applications.
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Affiliation(s)
- Susan Soleymani-Babadi
- Department of Chemistry, Faculty of Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
| | - Azizolla Beheshti
- Department of Chemistry, Faculty of Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
| | - Elahe Nasiri
- Department of Chemistry, Faculty of Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
| | - Maryam Bahrani-Pour
- Department of Chemistry, Faculty of Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
| | - Hossein Motamedi
- Department of Biology, Faculty of Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran.,Biotechnology and Biological Science Research Center, Shahid Chamran University of Ahvaz, Ahvaz, Iran
| | - Peter Mayer
- LMU München Department Chemie Butenandtstr, 5-13, (D)81377 München, Germany
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Kriegler K, Leser C, Mayer P, Bracher F. Effective chiral pool synthesis of both enantiomers of the TRPML inhibitor trans-ML-SI3. Arch Pharm (Weinheim) 2021; 355:e2100362. [PMID: 34738656 DOI: 10.1002/ardp.202100362] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/10/2021] [Accepted: 10/12/2021] [Indexed: 01/05/2023]
Abstract
Two independent chiral pool syntheses of both enantiomers of the TRPML inhibitor, trans-ML-SI3, were developed, starting from commercially available (1S,2R)- and (1R,2S)-configured cis-2-aminocyclohexanols. Both routes lead to the target compounds in excellent enantiomeric purity and good overall yields. For the most attractive (-)-trans-enantiomer, the R,R-configuration was identified by these unambiguous syntheses, and the results were confirmed by single-crystal X-ray structure analysis. These effective synthetic approaches further allow flexible variation of prominent residues in ML-SI3 for future in-depth analysis of structure-activity relationships as both the piperazine and the N-sulfonyl residues are introduced into the molecule at late stages of the synthesis.
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Affiliation(s)
- Katharina Kriegler
- Department of Pharmacy, Center for Drug Research, Ludwig-Maximilians University of Munich, Munich, Germany
| | - Charlotte Leser
- Department of Pharmacy, Center for Drug Research, Ludwig-Maximilians University of Munich, Munich, Germany
| | - Peter Mayer
- Department of Chemistry, Ludwig-Maximilians University of Munich, Munich, Germany
| | - Franz Bracher
- Department of Pharmacy, Center for Drug Research, Ludwig-Maximilians University of Munich, Munich, Germany
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Abstract
![]()
Red-light responsiveness
of photoswitches is a highly desired property
for many important application areas such as biology or material sciences.
The main approach to elicit this property uses strategic substitution
of long-known photoswitch motives such as azobenzenes or diarylethenes.
Only very few photoswitches possess inherent red-light absorption
of their core chromophore structures. Here, we present a strategy
to convert the long-known purple indirubin dye into a prolific red-light-responsive
photoswitch. In a supramolecular approach, its photochromism can be
changed from a negative to a positive one, while at the same time,
significantly higher yields of the metastable E-isomer
are obtained upon irradiation. E- to Z-photoisomerization can then also be induced by red light of longer
wavelengths. Indirubin therefore represents a unique example of reversible
photoswitching using entirely red light for both switching directions.
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Affiliation(s)
- Stefan Thumser
- Friedrich-Alexander Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Laura Köttner
- Friedrich-Alexander Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
| | - Nadine Hoffmann
- Ludwig-Maximilians Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Peter Mayer
- Ludwig-Maximilians Universität München, Department of Chemistry and Center for Integrated Protein Science CIPSM, Butenandtstr. 5-13, 81377 Munich, Germany
| | - Henry Dube
- Friedrich-Alexander Universität Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Nikolaus-Fiebiger-Str. 10, 91058 Erlangen, Germany
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Graf M, Czerwieniec R, Mayer P, Böttcher HC. Synthesis and structural characterization of bis-cyclometalated compounds [Ir(dFppy)2(Me4phen)]PF6 and [Ir(dF(CF3)ppy)2(Me4phen)]PF6. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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35
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Bala R, Behal J, Pal Sharma R, Prakash V, Mayer P, Piotrowski H, Schütt T, Klapötke TM. Cationic cobaltammines as anion receptors: Sonochemical synthesis, characterization and comparative account of antibacterial activity of nano and non-nano pentaammineazidocoablt(III) compounds. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115338] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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36
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Wildermuth RE, Steinborn C, Barber DM, Mühlfenzl KS, Kendlbacher M, Mayer P, Wurst K, Magauer T. Evolution of a Strategy for the Total Synthesis of (+)-Cornexistin. Chemistry 2021; 27:12181-12189. [PMID: 34105834 PMCID: PMC8457225 DOI: 10.1002/chem.202101849] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Indexed: 12/13/2022]
Abstract
Herein is given a full account of the evolution of the first total synthesis of (+)-cornexistin. Initial efforts were based on masking the reactive maleic anhydride moiety as a 3,4-substituted furan and on forming the nine-membered carbocycle in an intramolecular Conia-ene or Nozaki-Hiyama-Kishi (NHK) reaction. Those strategies suffered from low yields and were jeopardized by a late-stage installation of the Z-alkene, as well as the stereocenters along the eastern periphery. These issues were addressed by employing a chiral-pool strategy that involved construction of the crucial stereocenters at C2, C3 and C8 at an early stage with installation of the maleic anhydride as late as possible. The successful approach featured an intermolecular NHK coupling to install the Z-alkene, a syn-Evans-aldol reaction to forge the stereocenters along the eastern periphery, an intramolecular allylic alkylation to close the nine-membered carbocycle, and a challenging stepwise hydrolysis of a β-keto nitrile to furnish the maleic anhydride.
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Affiliation(s)
- Raphael E. Wildermuth
- Institute of Organic Chemistry and Center for Molecular BiosciencesLeopold-Franzens-University InnsbruckInnrain 80–826020InnsbruckAustria
- Department of Chemistry and PharmacyLudwig-Maximilians-University MunichButenandtstrasse 5–1381377MunichGermany
| | - Christian Steinborn
- Institute of Organic Chemistry and Center for Molecular BiosciencesLeopold-Franzens-University InnsbruckInnrain 80–826020InnsbruckAustria
| | - David M. Barber
- Research & DevelopmentWeed Control Chemistry, Bayer AG Crop Science Division Industriepark Höchst65926Frankfurt am MainGermany
| | - Kim S. Mühlfenzl
- Department of Chemistry and PharmacyLudwig-Maximilians-University MunichButenandtstrasse 5–1381377MunichGermany
| | - Mario Kendlbacher
- Institute of Organic Chemistry and Center for Molecular BiosciencesLeopold-Franzens-University InnsbruckInnrain 80–826020InnsbruckAustria
| | - Peter Mayer
- Department of Chemistry and PharmacyLudwig-Maximilians-University MunichButenandtstrasse 5–1381377MunichGermany
| | - Klaus Wurst
- Institute of GeneralInorganic & Theoretical ChemistryLeopold-Franzens-University InnsbruckInnrain 80–826020InnsbruckAustria
| | - Thomas Magauer
- Institute of Organic Chemistry and Center for Molecular BiosciencesLeopold-Franzens-University InnsbruckInnrain 80–826020InnsbruckAustria
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37
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Affiliation(s)
- Heinz Langhals
- Department of Chemistry LMU University of Munich Butenandtstr. 13 D-81377 Munich Germany
| | - Christian Dietl
- Department of Chemistry LMU University of Munich Butenandtstr. 13 D-81377 Munich Germany
| | - Peter Mayer
- Department of Chemistry LMU University of Munich Butenandtstr. 13 D-81377 Munich Germany
- X-ray crystal structure analysis Department of Chemistry LMU University of Munich Butenandtstr. 13 D-81377 Munich Germany
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38
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Huber LA, Thumser S, Grill K, Voßiek D, Bach NN, Mayer P, Dube H. Steric Effects on the Thermal Processes of Hemithioindigo Based Molecular Motor Rotation. Chemistry 2021; 27:10758-10765. [PMID: 33945652 PMCID: PMC8361725 DOI: 10.1002/chem.202100950] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Indexed: 12/21/2022]
Abstract
Tuning the thermal behavior of light driven molecular motors is fundamentally important for their future rational design. In many molecular motors thermal ratcheting steps are comprised of helicity inversions, energetically stabilizing the initial photoproducts. In this work we investigated a series of five hemithioindigo (HTI) based molecular motors to reveal the influence of steric hindrance in close proximity to the rotation axle on this process. Applying a high yielding synthetic procedure, we synthesized constitutional isomeric derivatives to distinguish between substitution effects at the aromatic and aliphatic position on the rotor fragment. The kinetics of thermal helix inversions were elucidated using low temperature 1 H NMR spectroscopy and an in situ irradiation technique. In combination with a detailed theoretical description, a comparative analysis of substituent effects on the thermal helix inversions of the rotation cycle is now possible. Such deeper understanding of the rotational cycle of HTI molecular motors is essential for speed regulation and future applications of visible light triggered nanomachines.
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Affiliation(s)
- Ludwig A. Huber
- Department für Chemie and Munich Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität München81377MunichGermany
| | - Stefan Thumser
- Department für Chemie and Munich Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität München81377MunichGermany
| | - Kerstin Grill
- Department für Chemie and Munich Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität München81377MunichGermany
| | - David Voßiek
- Department für Chemie and Munich Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität München81377MunichGermany
| | - Nicolai N. Bach
- Department of Chemistry and PharmacyFriedrich-Alexander-Universität Erlangen-NürnbergNikolaus-Fiebiger-Str. 1091058ErlangenGermany
| | - Peter Mayer
- Department für Chemie and Munich Center for Integrated Protein Science CIPSMLudwig-Maximilians-Universität München81377MunichGermany
| | - Henry Dube
- Department of Chemistry and PharmacyFriedrich-Alexander-Universität Erlangen-NürnbergNikolaus-Fiebiger-Str. 1091058ErlangenGermany
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39
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Małecka M, Kusz J, Mayer P, Sobiesiak M, Budzisz E. Zinc(II) and nickel(II) complexes of 3,5-dimethyl-1-(pyridin-2-yl)-1H-pyrazole: relationship between fluorescence and crystal packing. Acta Crystallogr C Struct Chem 2021; 77:321-330. [PMID: 34216437 DOI: 10.1107/s2053229621005374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 05/21/2021] [Indexed: 11/11/2022]
Abstract
Two novel coordination complexes, namely, dichlorido[3,5-dimethyl-1-(pyridin-2-yl-κN)-1H-pyrazole-κN2]zinc(II), [ZnCl2(C10H11N3)], 1, and aquachloridobis[3,5-dimethyl-1-(pyridin-2-yl-κN)-1H-pyrazole-κN2]nickel(II) chloride monohydrate, [NiCl(C10H11N3)(H2O)]Cl·H2O, 2, have been synthesized. The crystal structure analyses revealed that complexes 1 and 2 are mononuclear and have ZnN2Cl2 distorted tetrahedral and NiN4OCl distorted octahedral structures, respectively. Complex 1 displays a dimer in the crystal structure, while complex 2 forms a chain along the [010] direction. The fluorescence properties of both complexes were also investigated. A search of the Cambridge Structural Database for other complexes of the ligand 3,5-dimethyl-1-(pyridin-2-yl)-1H-pyrazole (L) shows that there exist different coordination polyhedra with different arrangements as monomers, dimers and polycyclic structures. Here it has also been demonstrated that there is a relationship between the crystal packing and the fluorescence properties of ZnII and CdII complexes of L.
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Affiliation(s)
- Magdalena Małecka
- Department of Physical Chemistry, University of Lodz, Pomorska 163/165, 90-236 Łódź, Poland
| | - Joachim Kusz
- Institute of Physics, University of Silesia, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
| | - Peter Mayer
- Department Chemie, LMU München Butenandtstrasse 5-13, München D81377, Germany
| | - Marta Sobiesiak
- Department of Inorganic and Analytical Chemistry, Faculty of Pharmacy, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, Jurasza 2, 85-089 Bydgoszcz, Poland
| | - Elzbieta Budzisz
- Department of the Chemistry of Cosmetic Raw Materials, Faculty of Pharmacy, Medical Iniversity of Lodz, Muszynskiego 1, 90-151 Łódź, Poland
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40
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Graf M, Böttcher H, Mayer P. Pentamethylcyclopentadienyl M(III) Complexes (M = Rh, Ir) Exhibiting 2,3,5,6‐tetra(2'‐pyridyl)pyrazine as Seven‐membered Chelating Ligand. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100121] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Marion Graf
- Department Chemie Ludwig-Maximilians-Universität Butenandtstrasse 5–13 D-81377 München Germany
| | - Hans‐Christian Böttcher
- Department Chemie Ludwig-Maximilians-Universität Butenandtstrasse 5–13 D-81377 München Germany
| | - Peter Mayer
- Department Chemie Ludwig-Maximilians-Universität Butenandtstrasse 5–13 D-81377 München Germany
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41
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Skjolding LM, Jørgensen LVG, Dyhr KS, Köppl CJ, McKnight US, Bauer-Gottwein P, Mayer P, Bjerg PL, Baun A. Assessing the aquatic toxicity and environmental safety of tracer compounds Rhodamine B and Rhodamine WT. Water Res 2021; 197:117109. [PMID: 33857893 DOI: 10.1016/j.watres.2021.117109] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 03/02/2021] [Accepted: 03/30/2021] [Indexed: 06/12/2023]
Abstract
Tracer tests represent a well-established method for delineating key environmental processes in various media and engineered systems. Tracers like Rhodamine B and WT are frequently applied due to their strong fluorescence even at low concentrations.. However, due to a lack of ecotoxicological data, limit values for these tracers cannot be determined. This study fills this critical data gap by providing ecotoxicity data for Rhodamine B and WT using a battery of short-term standardized tests, including growth rate inhibition tests with algae (Raphidocelis subcapitata) and lethality tests using crustaceans (Daphnia magna) and zebrafish (Danio rerio) embryos, and estimating EQS for surface water. For Rhodamine B, the effective and lethal concentration (EC50 and LC50) -causing 50% toxicity were in the range of 14-24 mg/L. For Rhodamine WT, no statistically significant effects were observed (p<0.05) at the tsted concentrations (up to 91, 100 and 200 mg/L for algae, crustaceans and fish embryos, respectively). Thus for all tested organisms, Rhodamine B was more toxic than Rhodamine WT (more than 14 times more toxic for R. subcapitata, 5.6 times for D. magna, 15 times for D. rerio embryos,based on EC10 and LC10 values). These results signify that read-across assessments using ecotoxicity data obtained with Rhodamine B is not advisable for estimating the ecotoxicity of Rhodamine WT. The annual-average quality standard (AA-QS) and maximum allowable concentration quality standard (MAC-QS) for Rhodamine B were found to be 14 and 140 µg/L, respectively. For Rhodamine WT, the corresponding values were estimated to >91 µg/L (AA-QS) and >910 µg/L (MAC-QS). Hence, concentrations below 140 µg/L or 910 µg/L for Rhodamine B and WT, respectively, are not expected to pose a risk to aquatic freshwater life in the case of intermittent discharges, e.g. tracer experiments released in streams.
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Affiliation(s)
- L M Skjolding
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, DK-2800 Kgs. Lyngby, Denmark.
| | - L vG Jørgensen
- Department of Veterinary and Animal Science, University of Copenhagen, Stigbøjlen 7, DK-1870 Frederiksberg C, Denmark
| | - K S Dyhr
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, DK-2800 Kgs. Lyngby, Denmark
| | - C J Köppl
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, DK-2800 Kgs. Lyngby, Denmark
| | - U S McKnight
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, DK-2800 Kgs. Lyngby, Denmark
| | - P Bauer-Gottwein
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, DK-2800 Kgs. Lyngby, Denmark
| | - P Mayer
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, DK-2800 Kgs. Lyngby, Denmark
| | - P L Bjerg
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, DK-2800 Kgs. Lyngby, Denmark
| | - A Baun
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, DK-2800 Kgs. Lyngby, Denmark
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42
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Brooks G, Mayer P. Roderick William Somerville Brooks. Assoc Med J 2021. [DOI: 10.1136/bmj.n1229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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43
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Karaghiosoff K, Klapötke TM, Kunz T, Mayer P, Beck W. Uranyl Complexes with Selenium or Tellurium Containing Chelate Ligands. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202000445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Konstantin Karaghiosoff
- Department of Chemistry and Biochemistry Ludwig-Maximilians University Butenandtstraße 5-13 (Haus D) D-81377 Munich Germany
| | - Thomas M. Klapötke
- Department of Chemistry and Biochemistry Ludwig-Maximilians University Butenandtstraße 5-13 (Haus D) D-81377 Munich Germany
| | - Thomas Kunz
- Department of Chemistry and Biochemistry Ludwig-Maximilians University Butenandtstraße 5-13 (Haus D) D-81377 Munich Germany
| | - Peter Mayer
- Department of Chemistry and Biochemistry Ludwig-Maximilians University Butenandtstraße 5-13 (Haus D) D-81377 Munich Germany
| | - Wolfgang Beck
- Department of Chemistry and Biochemistry Ludwig-Maximilians University Butenandtstraße 5-13 (Haus D) D-81377 Munich Germany
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44
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Mahmoud GA, Ibrahim ABM, Mayer P. (NH
4
)
2
[Ni(H
2
O)
6
]
2
V
10
O
28
⋅ 4H
2
O; Structural Analysis and Bactericidal Activity against Pathogenic Gram Negative Bacteria. ChemistrySelect 2021. [DOI: 10.1002/slct.202100006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Ahmed B. M. Ibrahim
- Department of Chemistry Faculty of Science Assiut University Assiut 71516 Egypt
| | - Peter Mayer
- Department Chemie Ludwig-Maximilians-Universität München Butenandtstr. 5–13, Haus D 81377 München Germany
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Uhl E, Mayer P, Dube H. Corrigendum: Active and Unidirectional Acceleration of Biaryl Rotation by a Molecular Motor. Angew Chem Int Ed Engl 2021; 60:7473. [PMID: 33751784 DOI: 10.1002/anie.202101793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Uhl E, Mayer P, Dube H. Berichtigung: Active and Unidirectional Acceleration of Biaryl Rotation by a Molecular Motor. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kirst C, Zoller F, Bräuniger T, Mayer P, Fattakhova-Rohlfing D, Karaghiosoff K. Investigation of Structural Changes of Cu(I) and Ag(I) Complexes Utilizing a Flexible, Yet Sterically Demanding Multidentate Phosphine Oxide Ligand. Inorg Chem 2021; 60:2437-2445. [PMID: 33534576 DOI: 10.1021/acs.inorgchem.0c03334] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The syntheses of a sterically demanding, multidentate bis(quinaldinyl)phenylphosphine oxide ligand and some Cu(I) and Ag(I) complexes thereof are described. By introducing a methylene group between the quinoline unit and phosphorus, the phosphine oxide ligand gains additional flexibility. This specific ligand design induces not only a versatile coordination chemistry but also a rarely observed and investigated behavior in solution. The flexibility of the birdlike ligand offers the unexpected opportunity of open-wing and closed-wing coordination to the metal. In fact, the determined crystal structures of these complexes show both orientations. Investigations of the ligand in solution show a strong dependency of the chemical shift of the CH2 protons on the solvent used. Variable-temperature, multinuclear NMR spectroscopy was carried out, and an interesting dynamic behavior of the complexes is observed. Due to the introduced flexibility, the quinaldinyl substituents change their arrangements from open-wing to closed-wing upon cooling, while still staying coordinated to the metal. This change in conformation is completely reversible when warming up the sample. Based on 2D NMR spectra measured at -80 °C, an assignment of the signals corresponding to the different arrangements was possible. Additionally, the copper(I) complex shows reversible redox activity in solution. The combination of structural flexibility of a multidentate ligand and the positive redox properties of the resulting complexes comprises key factors for a possible application of such compounds in transition-metal catalysis. Via a reorganization of the ligand, occurring transition states could be stabilized, and selectivity might be enhanced.
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Affiliation(s)
- Christin Kirst
- Department of Chemistry, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, DE 81377 Munich, Germany
| | - Florian Zoller
- Department of Chemistry, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, DE 81377 Munich, Germany.,Institute of Energy and Climate Research (IEK-1): Materials Synthesis and Processing, Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, 52425 Jülich, Germany.,Faculty of Engineering and Center for Nanointegration Duisburg-Essen (CENIDE), Universität Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany
| | - Thomas Bräuniger
- Department of Chemistry, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, DE 81377 Munich, Germany
| | - Peter Mayer
- Department of Chemistry, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, DE 81377 Munich, Germany
| | - Dina Fattakhova-Rohlfing
- Institute of Energy and Climate Research (IEK-1): Materials Synthesis and Processing, Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, 52425 Jülich, Germany.,Faculty of Engineering and Center for Nanointegration Duisburg-Essen (CENIDE), Universität Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany
| | - Konstantin Karaghiosoff
- Department of Chemistry, Ludwig Maximilian University of Munich, Butenandtstraße 5-13, DE 81377 Munich, Germany
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Mayer P, Giannakis A, Klauß M, Gaida MM, Bergmann F, Kauczor HU, Feisst M, Hackert T, Loos M. Radiological evaluation of pancreatic cancer: What is the significance of arterial encasement >180° after neoadjuvant treatment? Eur J Radiol 2021; 137:109603. [PMID: 33618209 DOI: 10.1016/j.ejrad.2021.109603] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 01/16/2021] [Accepted: 02/08/2021] [Indexed: 12/27/2022]
Abstract
PURPOSE This study aimed to evaluate contrast-enhanced computed tomography (CE-CT) features for prediction of arterial tumor invasion in pancreatic cancer (PDAC) patients in the event of arterial encasement >180° after neoadjuvant (radio-)chemotherapy (NAT). METHODS Seventy PDAC patients with seventy-five arteries showing encasement >180° after completion of NAT were analyzed. All patients underwent surgical exploration with either tumor resection including arterial resection, periadventitial dissection (arterial divestment) or confirmation of locally irresectable disease. CE-CT scans were assessed regarding tumor extent and artery-specific imaging features. The results were analyzed on a per-artery basis. Based on the intraoperative and histopathological findings, encased arteries were classified as either invaded or non-invaded. RESULTS Eighteen radiologically encased arteries were resected; of these, nine had pathologic evidence for tumor invasion. In 42 encased arteries, the tumor could be removed by arterial divestment. In 13 patients with 15 encased arteries, the tumor was deemed technically irresectable. Median tumor size, length of solid soft tissue contact, and degree of circumferential contiguity by solid soft tissue along the artery in CE-CT were significantly lower in the non-invaded than in the invaded artery group (p ≤ 0.017). Imaging features showed moderate accuracies for prediction of arterial invasion (≤72.0 %). The thresholds ≤26 mm for post-NAT solid soft tissue contact and ≤270° for circumferential contiguity by solid soft tissue had high negative predictive values (≥87.5 %). CONCLUSION Although post-NAT prediction of arterial invasion remains difficult, arteries with ≤270° contiguity by soft tissue and arteries with ≤26 mm length of solid soft tissue contact are unlikely to be invaded, with possible implications for surgical planning.
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Affiliation(s)
- P Mayer
- Department of Diagnostic and Interventional Radiology, Heidelberg University Hospital, Heidelberg, Germany.
| | - A Giannakis
- Department of Diagnostic and Interventional Radiology, Heidelberg University Hospital, Heidelberg, Germany
| | - M Klauß
- Department of Diagnostic and Interventional Radiology, Heidelberg University Hospital, Heidelberg, Germany
| | - M M Gaida
- Institute of Pathology, University Medical Center Mainz, Mainz, Germany
| | - F Bergmann
- Institute of Pathology, Heidelberg University Hospital, Heidelberg, Germany
| | - H U Kauczor
- Department of Diagnostic and Interventional Radiology, Heidelberg University Hospital, Heidelberg, Germany
| | - M Feisst
- Institute of Medical Biometry and Informatics, Heidelberg University, Heidelberg, Germany
| | - T Hackert
- Department of General, Visceral and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
| | - M Loos
- Department of General, Visceral and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
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Abstract
The reactivities of cyclic enones and α,β-unsaturated lactones were characterized by following the kinetics of their reactions with colored carbon-centered reference nucleophiles in DMSO at 20 °C. The experimentally determined second-order rate constants k2 were analyzed with the Mayr–Patz equation, lg k = sN(N + E), to furnish the electrophilicity descriptors E for the Michael acceptors. Cyclic enones and lactones show different reactivity trends than their acyclic analogs. While cyclization reduces the reactivity of enones slightly, α,β-unsaturated lactones are significantly more reactive Michael acceptors than analogously substituted open-chain esters. The observed reactivity trends were rationalized through quantum-chemically calculated Gibbs energy profiles (at the SMD(DMSO)/M06-2X/6-31+G(d,p) level of theory) and distortion interaction analysis for the reactions of the cyclic Michael acceptors with a sulfonium ylide. The electrophilicities of simplified electrophilic fragments reflect the general reactivity pattern of structurally more complex terpene-derived cyclic enones and sesquiterpene lactones, such as parthenolide. Different reactivity trends for cyclic and acyclic Michael acceptors were found within the framework of Mayr's experimental reactivity scales and analyzed through quantum-chemical studies.![]()
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Affiliation(s)
- Robert J Mayer
- Department Chemie, Ludwig-Maximilians-Universität München Butenandtstr. 5-13 81377 München Germany
| | - Patrick W A Allihn
- Department Chemie, Technische Universität München Lichtenbergstraße 4 85748 Garching Germany
| | - Nathalie Hampel
- Department Chemie, Ludwig-Maximilians-Universität München Butenandtstr. 5-13 81377 München Germany
| | - Peter Mayer
- Department Chemie, Ludwig-Maximilians-Universität München Butenandtstr. 5-13 81377 München Germany
| | - Stephan A Sieber
- Department Chemie, Technische Universität München Lichtenbergstraße 4 85748 Garching Germany
| | - Armin R Ofial
- Department Chemie, Ludwig-Maximilians-Universität München Butenandtstr. 5-13 81377 München Germany
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Langhals H, Mayer P, Polborn K, Reichherzer S. A Three-Step Synthesis of 1,7-Diazaperylene and Derivatives. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/s-0040-1707293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Abstract1,7-Diazaperylene and various derivatives were synthesised in an upscaleable route from 1,5-diaminoanthraquinone and its Meerwein reaction with acrylonitrile and subsequent cyclisation with ammonia. The application of tert-butyl alcohol as the solvent led to a significant improvement in the Meerwein reaction.
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