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Morozov B, Oshchepkov AS, Klemt I, Agafontsev AM, Krishna S, Hampel F, Xu HG, Mokhir A, Guldi D, Kataev E. Supramolecular Recognition of Cytidine Phosphate in Nucleotides and RNA Sequences. JACS Au 2023; 3:964-977. [PMID: 37006770 PMCID: PMC10052242 DOI: 10.1021/jacsau.2c00658] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 12/19/2022] [Accepted: 12/19/2022] [Indexed: 06/19/2023]
Abstract
Supramolecular recognition of nucleotides would enable manipulating crucial biochemical pathways like transcription and translation directly and with high precision. Therefore, it offers great promise in medicinal applications, not least in treating cancer or viral infections. This work presents a universal supramolecular approach to target nucleoside phosphates in nucleotides and RNA. The artificial active site in new receptors simultaneously realizes several binding and sensing mechanisms: encapsulation of a nucleobase via dispersion and hydrogen bonding interactions, recognition of the phosphate residue, and a self-reporting feature-"turn-on" fluorescence. Key to the high selectivity is the conscious separation of phosphate- and nucleobase-binding sites by introducing specific spacers in the receptor structure. We have tuned the spacers to achieve high binding affinity and selectivity for cytidine 5' triphosphate coupled to a record 60-fold fluorescence enhancement. The resulting structures are also the first functional models of poly(rC)-binding protein coordinating specifically to C-rich RNA oligomers, e.g., the 5'-AUCCC(C/U) sequence present in poliovirus type 1 and the human transcriptome. The receptors bind to RNA in human ovarian cells A2780, causing strong cytotoxicity at 800 nM. The performance, self-reporting property, and tunability of our approach open up a promising and unique avenue for sequence-specific RNA binding in cells by using low-molecular-weight artificial receptors.
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Affiliation(s)
- Boris
S. Morozov
- Department
of Chemistry and Pharmacy, Friedrich-Alexander-Universität
Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, Erlangen 91058, Germany
| | | | - Insa Klemt
- Department
of Chemistry and Pharmacy, Friedrich-Alexander-Universität
Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, Erlangen 91058, Germany
| | - Aleksandr M. Agafontsev
- Department
of Chemistry and Pharmacy, Friedrich-Alexander-Universität
Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, Erlangen 91058, Germany
| | - Swathi Krishna
- Department
of Chemistry and Pharmacy, Interdisciplinary Center for Molecular
Materials (ICMM), Friedrich-Alexander-Universität
Erlangen-Nürnberg, Egerlandstr. 3, Erlangen 91058, Germany
| | - Frank Hampel
- Department
of Chemistry and Pharmacy, Friedrich-Alexander-Universität
Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, Erlangen 91058, Germany
| | - Hong-Gui Xu
- Department
of Chemistry and Pharmacy, Friedrich-Alexander-Universität
Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, Erlangen 91058, Germany
| | - Andriy Mokhir
- Department
of Chemistry and Pharmacy, Friedrich-Alexander-Universität
Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, Erlangen 91058, Germany
| | - Dirk Guldi
- Department
of Chemistry and Pharmacy, Interdisciplinary Center for Molecular
Materials (ICMM), Friedrich-Alexander-Universität
Erlangen-Nürnberg, Egerlandstr. 3, Erlangen 91058, Germany
| | - Evgeny Kataev
- Department
of Chemistry and Pharmacy, Friedrich-Alexander-Universität
Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 10, Erlangen 91058, Germany
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Schaub TA, Zieleniewska A, Kaur R, Minameyer M, Yang W, Schüßlbauer CM, Zhang L, Freiberger M, Zakharov LN, Drewello T, Dral PO, Guldi D, Jasti R. Tunable Macrocyclic Polyparaphenylene Nanolassos via Copper-Free Click Chemistry. Chemistry 2023:e202300668. [PMID: 36880222 DOI: 10.1002/chem.202300668] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/03/2023] [Accepted: 03/06/2023] [Indexed: 03/08/2023]
Abstract
Deriving diverse compound libraries from a single substrate in high yields remains to be a challenge in cycloparaphenylene chemistry. In here, a strategy for the late-stage functionalization of shape-persistent alkyne-containing cycloparaphenylene has been explored using readily available azides. The copper-free [3+2]azide-alkyne cycloaddition provided high yields (>90%) in a single reaction step. Systematic variation of the azides from electron-rich to -deficient shines light on how peripheral substitution influences the characteristics of the resulting adducts. We find that among the most affected properties are the molecular shape, the oxidation potential, excited state features, and affinities towards different fullerenes. Joint experimental and theoretical results are presented including calculations with the state-of-the-art, artificial intelligence-enhanced quantum mechanical method 1 (AIQM1).
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Affiliation(s)
- Tobias Andreas Schaub
- Institute of Organic Chemistry, Ruprecht-Karls-University Heidelberg, Department of Chemsitry and Geosciences, Im Neuenheimer Feld 270, 69120, Heidelberg, GERMANY
| | - Anna Zieleniewska
- Universität Erlangen-Nürnberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg, Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), GERMANY
| | - Ramandeep Kaur
- University of Erlangen-Nurnberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg, Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), GERMANY
| | - Martin Minameyer
- University of Erlangen-Nuernberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg, Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Ma, GERMANY
| | - Wudi Yang
- Xiamen University, Department of Chemistry, and College of Chemistry and Chemical Engineering, CHINA
| | - Christoph M Schüßlbauer
- University of Erlangen-Nuernberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg, Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), GERMANY
| | - Lina Zhang
- Xiamen University, Department of Chemistry, and College of Chemistry and Chemical Engineering, CHINA
| | - Markus Freiberger
- University of Erlangen-Nuernberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg, Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), GERMANY
| | - Lev N Zakharov
- University of Oregon, Department of Chemistry & Biochemistry and Material Science Institute, UNITED STATES
| | - Thomas Drewello
- University of Erlangen-Nuernberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg, Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), GERMANY
| | - Pavlo O Dral
- Xiamen University, Department of Chemistry, and College of Chemistry and Chemical Engineering, CHINA
| | - Dirk Guldi
- University of Erlangen-Nuernberg: Friedrich-Alexander-Universitat Erlangen-Nurnberg, Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), GERMANY
| | - Ramesh Jasti
- University of Oregon, Department of Chemistry & Biochemistry and Material Science Institute, UNITED STATES
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Zank S, Fernández-García JM, Stasyuk A, Voityuk A, Krug M, Solà M, Guldi D, Martin N. Initiating Electron Transfer in Doubly-curved Nanographene Upon Supramolecular Complexation of C 60. Angew Chem Int Ed Engl 2021; 61:e202112834. [PMID: 34633126 PMCID: PMC9303211 DOI: 10.1002/anie.202112834] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [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: 09/21/2021] [Indexed: 11/25/2022]
Abstract
The formation of supramolecular complexes between C60 and a molecular nanographene endowed with both positive and negative curvatures is described. The presence of a corannulene moiety and the saddle shape of the molecular nanographene allows the formation of complexes with 1:1, 1:2, and 2:1 stoichiometries. The association constants for the three possible supramolecular complexes were determined by 1H NMR titration. Furthermore, the stability of the three complexes was calculated by theoretical methods that also predict the photoinduced electron transfer from the curved nanographene to the electron acceptor C60. Time‐resolved transient absorption measurements on the ns‐time scale showed that the addition of C60 to NG‐1 solutions and photo‐exciting them at 460 nm leads to the solvent‐dependent formation of new species, in particular the formation of the one‐electron reduced form of C60 in benzonitrile was observed.
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Affiliation(s)
- Simon Zank
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Department of Chemistry and Pharmacy, GERMANY
| | | | - Anton Stasyuk
- Universitat de Girona, Institut de Química Computacional and Department de Química, SPAIN
| | - Alexander Voityuk
- Institucion Catalana de Investigacion y Estudios Avanzados: Institucio Catalana de Recerca i Estudis Avancats, ICREA, SPAIN
| | - Marcel Krug
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Department of Chemistry and Pharmacy, GERMANY
| | - Miquel Solà
- Universitat de Girona, Institut de Química Computacional and Departament de química, SPAIN
| | - Dirk Guldi
- Friedrich-Alexander-Universitat Erlangen-Nurnberg, Department of Chemistry and Pharmacy, GERMANY
| | - Nazario Martin
- University Complutense, Organic Chemistry, Faculty of Chemistry, 28040, Madrid, SPAIN
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Hou Y, Xie C, Radmilovic VV, Puscher B, Wu M, Heumüller T, Karl A, Li N, Tang X, Meng W, Chen S, Osvet A, Guldi D, Spiecker E, Radmilović VR, Brabec CJ. Assembling Mesoscale-Structured Organic Interfaces in Perovskite Photovoltaics. Adv Mater 2019; 31:e1806516. [PMID: 30633825 DOI: 10.1002/adma.201806516] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 12/16/2018] [Indexed: 06/09/2023]
Abstract
Mesoscale-structured materials offer broad opportunities in extremely diverse applications owing to their high surface areas, tunable surface energy, and large pore volume. These benefits may improve the performance of materials in terms of carrier density, charge transport, and stability. Although metal oxides-based mesoscale-structured materials, such as TiO2 , predominantly hold the record efficiency in perovskite solar cells, high temperatures (above 400 °C) and limited materials choices still challenge the community. A novel route to fabricate organic-based mesoscale-structured interfaces (OMI) for perovskite solar cells using a low-temperature and green solvent-based process is presented here. The efficient infiltration of organic porous structures based on crystalline nanoparticles allows engineering efficient "n-i-p" and "p-i-n" perovskite solar cells with enhanced thermal stability, good performance, and excellent lateral homogeneity. The results show that this method is universal for multiple organic electronic materials, which opens the door to transform a wide variety of organic-based semiconductors into scalable n- or p-type porous interfaces for diverse advanced applications.
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Affiliation(s)
- Yi Hou
- Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 7, 91058, Erlangen, Germany
| | - Chen Xie
- Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 7, 91058, Erlangen, Germany
| | - Vuk V Radmilovic
- Innovation Center, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120, Belgrade, Serbia
| | - Bianka Puscher
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058, Erlangen, Germany
| | - Mingjian Wu
- Institute of Micro- and Nanostructure Research & Center for Nanoanalysis and Electron Microscopy (CENEM), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstr. 6, 91058, Erlangen, Germany
| | - Thomas Heumüller
- Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 7, 91058, Erlangen, Germany
| | - André Karl
- Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 7, 91058, Erlangen, Germany
| | - Ning Li
- Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 7, 91058, Erlangen, Germany
- Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou, 450002, China
| | - Xiaofeng Tang
- Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 7, 91058, Erlangen, Germany
| | - Wei Meng
- Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 7, 91058, Erlangen, Germany
| | - Shi Chen
- Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 7, 91058, Erlangen, Germany
| | - Andres Osvet
- Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 7, 91058, Erlangen, Germany
| | - Dirk Guldi
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, D-91058, Erlangen, Germany
| | - Erdmann Spiecker
- Institute of Micro- and Nanostructure Research & Center for Nanoanalysis and Electron Microscopy (CENEM), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstr. 6, 91058, Erlangen, Germany
| | | | - Christoph J Brabec
- Institute of Materials for Electronics and Energy Technology (i-MEET), Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 7, 91058, Erlangen, Germany
- Bavarian Center for Applied Energy Research (ZAE Bayern), Immerwahrstr. 2, 91058, Erlangen, Germany
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5
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Teders M, Henkel C, Anhäuser L, Strieth-Kalthoff F, Gómez-Suárez A, Kleinmans R, Kahnt A, Rentmeister A, Guldi D, Glorius F. The energy-transfer-enabled biocompatible disulfide–ene reaction. Nat Chem 2018; 10:981-988. [DOI: 10.1038/s41557-018-0102-z] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 05/29/2018] [Indexed: 12/17/2022]
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6
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Sorsche D, Schaub M, Heinemann FW, Habermehl J, Kuhri S, Guldi D, Guthmuller J, Rau S. π-Stacking attraction vs. electrostatic repulsion: competing supramolecular interactions in a tpphz-bridged Ru(ii)/Au(iii) complex. Dalton Trans 2018; 45:12846-53. [PMID: 27472004 DOI: 10.1039/c6dt01643j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and characterization of a mixed metal ruthenium(ii)/gold(iii) complex bridged by tetrapyridophenazine (tpphz) are described. It is isostructural and isoelectronic to the well-known photocatalysts with palladium(ii) or platinum(ii). Concentration dependent (1)H-NMR spectroscopy and XRD studies show that the electrostatic repulsion between the gold(iii) moieties exceeds the attractive π-stacking interaction. Theoretical calculations based on the new structural data confirm an increased positive charge on the bridging ligand as well as significantly altered orbital symmetry as compared to the previously investigated palladium(ii) complex. This is the first example of a tpphz ruthenium(ii) complex where π-stacking is completely inhibited. The detailed investigation of the solid-state structure showed for the first time in bimetallic tpphz bridged complexes no significant torsion within the bridging ligand itself. Although catalytic performance for proton reduction by gold(iii) is naturally not observed, its photochemical decomposition in colloidal gold particles could be shown by TEM and DLS.
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Affiliation(s)
- Dieter Sorsche
- Institute for Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany.
| | - Markus Schaub
- Institute for Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany.
| | - Frank W Heinemann
- Institute of Inorganic and General Chemistry, Egerlandstr. 1, D-91058 Erlangen, Germany
| | - Johannes Habermehl
- Institute for Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany.
| | - Susanne Kuhri
- Institute of Energy and Climate Research, Electrochemical Process Engineering (IEK-3), Wilhelm-Johnen-Straße, D-52428 Jülich, Germany
| | - Dirk Guldi
- Friedrich-Alexander-Universität Erlangen/Nürnberg, Department Chemie und Pharmazie, Lehrstuhl für Physikalische Chemie I, Egerlandstraße 3, D-91058 Erlangen, Germany
| | - Julien Guthmuller
- Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
| | - Sven Rau
- Institute for Inorganic Chemistry I, Ulm University, Albert-Einstein-Allee 11, D-89081 Ulm, Germany.
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Stumper A, Pilz TD, Schaub M, Görls H, Sorsche D, Peuntinger K, Guldi D, Rau S. Efficient Access to 5-Bromo- and 5,6-Dibromophenanthroline Ligands. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700548] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Anne Stumper
- Institute of Inorganic Chemistry; Materials and Catalysis; Ulm University; Albert-Einstein-Allee 11 89081 Ulm, Germany
| | - Thomas David Pilz
- Institute for Inorganic and Analytical Chemistry; Friedrich Schiller University Jena; August-Bebel-Straße 2 07743 Jena Germany
| | - Markus Schaub
- Institute of Inorganic Chemistry; Materials and Catalysis; Ulm University; Albert-Einstein-Allee 11 89081 Ulm, Germany
| | - Helmar Görls
- Institute for Inorganic and Analytical Chemistry; Friedrich Schiller University Jena; August-Bebel-Straße 2 07743 Jena Germany
| | - Dieter Sorsche
- Institute of Inorganic Chemistry; Materials and Catalysis; Ulm University; Albert-Einstein-Allee 11 89081 Ulm, Germany
| | - Katrin Peuntinger
- Institute of Chemistry and Pharmacy; Friedrich-Alexander-University Erlangen-Nuremberg; Egerlandstr. 3 91058 Erlangen Germany
| | - Dirk Guldi
- Institute of Chemistry and Pharmacy; Friedrich-Alexander-University Erlangen-Nuremberg; Egerlandstr. 3 91058 Erlangen Germany
| | - Sven Rau
- Institute of Inorganic Chemistry; Materials and Catalysis; Ulm University; Albert-Einstein-Allee 11 89081 Ulm, Germany
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Abstract
Extra energy required: One of the most critical issues facing society today is energy - where do we get it from, how do we use it, how do we store it, how can we save it. Chemists play a decisive role in facing these challenges to secure a ready supply of energy for generations to come. To highlight the importance of this topic and the contributions that chemists around the world make, this special issue is dedicated to energy conversion and storage. Graphic designed by Freepik. http://www.freepik.com/free-vector/ batteries_800894.htm.
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Affiliation(s)
- Jaephil Cho
- Department of Energy Engineering and School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 689-798, Ulsan, South Korea.
| | - Liming Dai
- Department of Macromolecular Science and Engineering, Case School of Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA.
| | - Dirk Guldi
- Department of Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058, Erlangen, Germany.
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Dryfe R, Chen GZ, Bayer D, Jonsson-Niedziolka M, McCreery R, Macpherson J, Abruña H, Gogotsi Y, Hu CC, Béguin F, Hardwick L, Foord J, Duca M, Howe E, Holt K, Alvarez-Guerra M, Unwin PR, Rabbow T, Shaffer M, Lee JS, Frackowiak E, Qiu F, Dyatkin B, Ash PA, Stevenson K, Guldi D, Bergonzo P. The many faces of carbon in electrochemistry: general discussion. Faraday Discuss 2014; 172:117-37. [DOI: 10.1039/c4fd90025a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gogotsi Y, Guldi D, McCreery R, Hu CC, Merlet C, Béguin F, Hardwick L, Frackowiak E, Macpherson J, Forse A, Chen GZ, Holt K, Dryfe R, Kurig H, Sharma S, Unwin PR, Rabbow T, Yu W, Qiu F, Juarez F, Sole C, Dyatkin B, Stevenson K, Cao Y, Cousens N, Noofeli A. Carbon electrodes for energy storage: general discussion. Faraday Discuss 2014; 172:239-60. [DOI: 10.1039/c4fd90026j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Flyunt R, Knolle W, Kahnt A, Prager A, Lotnyk A, Malig J, Guldi D, Abel B. Mechanistic aspects of the radiation-chemical reduction of graphene oxide to graphene-like materials. Int J Radiat Biol 2014; 90:486-94. [DOI: 10.3109/09553002.2014.907934] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Mewes PW, Foertsch S, Juloski AL, Angelopoulou E, Goelder SK, Guldi D, Hornegger J, Messmann H. Chromoendoscopy in magnetically guided capsule endoscopy. Biomed Eng Online 2013; 12:52. [PMID: 23758801 PMCID: PMC3689635 DOI: 10.1186/1475-925x-12-52] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [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] [Received: 03/08/2013] [Accepted: 06/05/2013] [Indexed: 11/21/2022] Open
Abstract
Background Diagnosis of intestinal metaplasia and dysplasia via conventional endoscopy is characterized by low interobserver agreement and poor correlation with histopathologic findings. Chromoendoscopy significantly enhances the visibility of mucosa irregularities, like metaplasia and dysplasia mucosa. Magnetically guided capsule endoscopy (MGCE) offers an alternative technology for upper GI examination. We expect the difficulties of diagnosis of neoplasm in conventional endoscopy to transfer to MGCE. Thus, we aim to chart a path for the application of chromoendoscopy on MGCE via an ex-vivo animal study. Methods We propose a modified preparation protocol which adds a staining step to the existing MGCE preparation protocol. An optimal staining concentration is quantitatively determined for different stain types and pathologies. To that end 190 pig stomach tissue samples with and without lesion imitations were stained with different dye concentrations. Quantitative visual criteria are introduced to measure the quality of the staining with respect to mucosa and lesion visibility. Thusly determined optimal concentrations are tested in an ex-vivo pig stomach experiment under magnetic guidance of an endoscopic capsule with the modified protocol. Results We found that the proposed protocol modification does not impact the visibility in the stomach or steerability of the endoscopy capsule. An average optimal staining concentration for the proposed protocol was found at 0.4% for Methylene blue and Indigo carmine. The lesion visibility is improved using the previously obtained optimal dye concentration. Conclusions We conclude that chromoendoscopy may be applied in MGCE and improves mucosa and lesion visibility. Systematic evaluation provides important information on appropriate staining concentration. However, further animal and human in-vivo studies are necessary.
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Affiliation(s)
- Philip W Mewes
- Pattern Recognition Lab, University of Erlangen-Nuremberg, Martensstrasse 3, Erlangen Germany.
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Gard MN, Zucchero AJ, Kuzmanich G, Oelsner C, Guldi D, Dreuw A, Bunz UHF, Garcia-Garibay MA. Cruciforms’ Polarized Emission Confirms Disjoint Molecular Orbitals and Excited States. Org Lett 2012; 14:1000-3. [DOI: 10.1021/ol203321m] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew N. Gard
- Department of Chemistry, University of California, Los Angeles, California 90095-1559, United States, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States, Department of Chemistry and Pharmacy & Interdisciplinary Center of Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91054 Erlangen, Germany, Interdisciplinary Center for Scientific Computing, Ruprecht-Karls Universität, Im Neuenheimer Feld 368, 69120
| | - Anthony J. Zucchero
- Department of Chemistry, University of California, Los Angeles, California 90095-1559, United States, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States, Department of Chemistry and Pharmacy & Interdisciplinary Center of Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91054 Erlangen, Germany, Interdisciplinary Center for Scientific Computing, Ruprecht-Karls Universität, Im Neuenheimer Feld 368, 69120
| | - Gregory Kuzmanich
- Department of Chemistry, University of California, Los Angeles, California 90095-1559, United States, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States, Department of Chemistry and Pharmacy & Interdisciplinary Center of Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91054 Erlangen, Germany, Interdisciplinary Center for Scientific Computing, Ruprecht-Karls Universität, Im Neuenheimer Feld 368, 69120
| | - Christian Oelsner
- Department of Chemistry, University of California, Los Angeles, California 90095-1559, United States, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States, Department of Chemistry and Pharmacy & Interdisciplinary Center of Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91054 Erlangen, Germany, Interdisciplinary Center for Scientific Computing, Ruprecht-Karls Universität, Im Neuenheimer Feld 368, 69120
| | - Dirk Guldi
- Department of Chemistry, University of California, Los Angeles, California 90095-1559, United States, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States, Department of Chemistry and Pharmacy & Interdisciplinary Center of Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91054 Erlangen, Germany, Interdisciplinary Center for Scientific Computing, Ruprecht-Karls Universität, Im Neuenheimer Feld 368, 69120
| | - Andreas Dreuw
- Department of Chemistry, University of California, Los Angeles, California 90095-1559, United States, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States, Department of Chemistry and Pharmacy & Interdisciplinary Center of Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91054 Erlangen, Germany, Interdisciplinary Center for Scientific Computing, Ruprecht-Karls Universität, Im Neuenheimer Feld 368, 69120
| | - Uwe H. F. Bunz
- Department of Chemistry, University of California, Los Angeles, California 90095-1559, United States, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States, Department of Chemistry and Pharmacy & Interdisciplinary Center of Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91054 Erlangen, Germany, Interdisciplinary Center for Scientific Computing, Ruprecht-Karls Universität, Im Neuenheimer Feld 368, 69120
| | - Miguel A. Garcia-Garibay
- Department of Chemistry, University of California, Los Angeles, California 90095-1559, United States, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States, Department of Chemistry and Pharmacy & Interdisciplinary Center of Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91054 Erlangen, Germany, Interdisciplinary Center for Scientific Computing, Ruprecht-Karls Universität, Im Neuenheimer Feld 368, 69120
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Guldi D. Fullerene Polymers. Synthesis, Properties and Applications. Herausgegeben von Nazario Martín und Francesco Giacalone. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200907061] [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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Witte P, Beuerle F, Hartnagel U, Lebovitz R, Savouchkina A, Sali S, Guldi D, Chronakis N, Hirsch A. Water solubility, antioxidant activity and cytochrome C binding of four families of exohedral adducts of C60 and C70. Org Biomol Chem 2007; 5:3599-613. [PMID: 17971989 DOI: 10.1039/b711912g] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Over the past decade, surface-modified, water soluble fullerenes have been shown by many different investigators to exhibit strong antioxidant activity against reactive oxygen species (ROS) in vitro and to protect cells and tissues from oxidative injury and cell death in vivo. Nevertheless, progress in developing fullerenes as bona fide drug candidates has been hampered by three development issues: 1) lack of methods for scalable synthesis; 2) inability to produce highly purified, single-species regioisomers compatible with pharmaceutical applications; and 3) inadequate understanding of structure-function relationships with respect to various surface modifications (e.g., anionic versus cationic versus charge-neutral polarity). To address these challenges, we have designed and synthesized more than a dozen novel water soluble fullerenes that can be purified as single isomers and which we believe can be manufactured to scale at reasonable cost. These compounds differ in addition pattern, lipophilicity and number and type of charge and were examined for their water solubility, antioxidant activity against superoxide anions and binding of cytochrome C. Our results indicate that dendritic water soluble fullerene[60] monoadducts exhibit the highest degree of antioxidant activity against superoxide anions in vitro as compared with trismalonate-derived anionic fullerenes as well as cationic fullerenes of similar overall structure. Among the higher adducts, anionic derivatives have a higher antioxidant activity than comparable cationic compounds. To achieve sufficient water solubility without the aid of a surfactant or co-solvent at least three charges on the addends are required. Significantly, anionic in contrast to cationic fullerene adducts bind with high affinity to cytochrome C.
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Affiliation(s)
- Patrick Witte
- The Institut für Organische Chemie, Universität Erlangen-Nürnberg, Henkestrasse 42, Erlangen, Germany
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Hauke F, Hirsch A, Atalick S, Guldi D. Cover Picture: Quantitative Transduction of Excited-State Energy in Fluorophore-Heterofullerene Conjugates (Eur. J. Org. Chem. 9/2005). European J Org Chem 2005. [DOI: 10.1002/ejoc.200590018] [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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Hauke F, Hirsch A, Atalick S, Guldi D. Quantitative Transduction of Excited-State Energy inFluorophore-Heterofullerene Conjugates. European J Org Chem 2005. [DOI: 10.1002/ejoc.200400771] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Abstract
The highly regioselective attack of a C(60) malonate containing a terminal acetyl function to the heterofullerene cage C(59)N leads to the formation of the first fullerene-heterofullerene dyad, representing a new scaffold for directional energy transduction.
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Affiliation(s)
- Frank Hauke
- Department of Chemistry, Clemson University, SC 29634, USA
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Kordatos K, Da Ros T, Prato M, Luo C, Guldi D. Novel Functional Fullerene Materials: Fullerenes as Energy Acceptors. Monatshefte fuer Chemie/Chemical Monthly 2001. [DOI: 10.1007/s007060170145] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ros TD, Prato M, Guldi D, Alessio E, Ruzzi M, Pasimeni L. A noncovalently linked, dynamic fullerene porphyrin dyad. Efficient formation of long-lived charge separated states through complex dissociation. Chem Commun (Camb) 1999. [DOI: 10.1039/a900645a] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Guldi D, Wasgestian F, Meyerstein D. The effect of N-methylation on the spectroscopical and electrochemical properties of 1,4,8,11-tetraazacyclotetradecane chromium(III) complexes. Inorganica Chim Acta 1992. [DOI: 10.1016/s0020-1693(00)85817-x] [Citation(s) in RCA: 10] [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: 11/15/2022]
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