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Maity A, Mishra VK, Dolai S, Mishra S, Patra SK. Design, Synthesis, and Characterization of Organometallic BODIPY-Ru(II) Dyads: Redox and Photophysical Properties with Singlet Oxygen Generation Capability†. Inorg Chem 2024; 63:4839-4854. [PMID: 38433436 DOI: 10.1021/acs.inorgchem.3c03610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2024]
Abstract
A series of Ru(II)-acetylide complexes (Ru1, Ru2, and Ru1m) with alkynyl-functionalized borondipyrromethene (BODIPY) conjugates were designed by varying the position of the linker that connects the BODIPY unit to the Ru(II) metal center through acetylide linkage at either the 2-(Ru1) and 2,6-(Ru2) or the meso-phenyl (Ru1m) position of the BODIPY scaffold. The Ru(II) organometallic complexes were characterized by various spectroscopic methods, including nuclear magnetic resonance (NMR) spectroscopy, infrared (IR) spectroscopy, CHN, and high-resolution mass spectrometry (HRMS) analyses. The Ru(II)-BODIPY conjugates exhibit fascinating electrochemical and photophysical properties. All BODIPY-Ru(II) complexes exhibit strong absorption (εmax = 29,000-72,000 M-1 cm-1) in the visible region (λmax = 502-709 nm). Fluorescence is almost quenched for Ru1 and Ru2, whereas Ru1m shows the residual fluorescence of the corresponding BODIPY core at 517 nm. The application of the BODIPY-Ru(II) dyads as nonporphyrin-based triplet photosensitizers was explored by a method involving the singlet oxygen (1O2)-mediated photo-oxidation of diphenylisobenzofuran. Effective π-conjugation between the BODIPY chromophore and Ru(II) center in the case of Ru1 and Ru2 was found to be necessary to improve intersystem crossing (ISC) and hence the 1O2-sensitizing ability. In addition, electrochemical studies indicate electronic interplay between the metal center and the redox-active BODIPY in the BODIPY-Ru(II) dyads.
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Affiliation(s)
- Apurba Maity
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Vipin Kumar Mishra
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Suman Dolai
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Sabyashachi Mishra
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Sanjib K Patra
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
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2
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Hoyas Pérez N, Sherin PS, Posligua V, Greenfield JL, Fuchter MJ, Jelfs KE, Kuimova MK, Lewis JEM. Emerging properties from mechanical tethering within a post-synthetically functionalised catenane scaffold. Chem Sci 2022; 13:11368-11375. [PMID: 36320581 PMCID: PMC9533469 DOI: 10.1039/d2sc04101d] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 09/06/2022] [Indexed: 09/06/2024] Open
Abstract
Maintaining close spatial proximity of functional moieties within molecular systems can result in fascinating emergent properties. Whilst much work has been done on covalent tethering of functional units for myriad applications, investigations into mechanically linked systems are relatively rare. Formation of the mechanical bond is usually the final step in the synthesis of interlocked molecules, placing limits on the throughput of functionalised architectures. Herein we present the synthesis of a bis-azide [2]catenane scaffold that can be post-synthetically modified using CuAAC 'click' chemistry. In this manner we have been able to access functionalised catenanes from a common precursor and study the properties of electrochemically active, emissive and photodimerisable units within the mechanically interlocked system in comparison to non-interlocked analogues. Our data demonstrates that the greater (co-)conformational flexibility that can be obtained with mechanically interlocked systems compared to traditional covalent tethers paves the way for developing new functional molecules with exciting properties.
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Affiliation(s)
- Nadia Hoyas Pérez
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub 82 Wood Lane London W12 0BZ UK
| | - Peter S Sherin
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub 82 Wood Lane London W12 0BZ UK
| | - Victor Posligua
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub 82 Wood Lane London W12 0BZ UK
| | - Jake L Greenfield
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub 82 Wood Lane London W12 0BZ UK
| | - Matthew J Fuchter
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub 82 Wood Lane London W12 0BZ UK
| | - Kim E Jelfs
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub 82 Wood Lane London W12 0BZ UK
| | - Marina K Kuimova
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub 82 Wood Lane London W12 0BZ UK
| | - James E M Lewis
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub 82 Wood Lane London W12 0BZ UK
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3
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Bruña S, Valverde-González A, Montero-Campillo MM, Mó O, Cuadrado I. Thiol-yne chemistry of diferrocenylacetylene: from synthesis and electrochemistry to theoretical studies. Dalton Trans 2022; 51:15412-15424. [PMID: 36156664 DOI: 10.1039/d2dt02378d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The thiol-yne coupling chemistry of diferrocenylacetylene (FcCCFc) 1, bearing two electron rich and redox-active ferrocenyl units (Fc = Fe(η5-C5H4)(η5-C5H5)) and an internal triple bond, has been investigated for the first time. In order to determine whether steric limitations might affect hydrothiolation, a model reaction using a functionalized monothiol was tested, namely 2-mercaptoethanol I. The thiol-diferrocenylacetylene reactions were initiated either thermally (in toluene with AIBN) or by UV light irradiation (in THF and in the presence of DMPA as the photoinitiator). The outcomes of these thiol-yne reactions showed a strong dependence on the initiation method used, with the thermally initiated one being the most efficient. These thiol-diferrocenylacetylene reactions mainly afforded the (Z)-stereoisomer of the newly obtained vinyl thioether sulfide FcCHC(Fc)S-(CH2)2OH (2), unlike the more common (E)-vinyl sulfides found in other additions to alkynes. The hydrothiolation of the internal -CC- bond in 1 was successfully extended to dithiol 2,2'-(ethylenedioxy)diethanethiol II, leading to the formation of the (ZZ)-isomer, with four ferrocenyl units, as the major product. According to the electrochemical studies, the new asymmetrical ferrocenyl-vinyl sulfides show iron-iron electronic and electrostatic interactions. Theoretical results for the (Z)-stereoisomer (2) suggest that adiabatic oxidation would lead to the loss of almost one electron on the ferrocenyl subunit closer to the thioether chain. Furthermore, the thiol-yne chemistry of the internal -CC- bond in diferrocenylacetylene has been compared to the external triple bond in ethynylferrocene, the theoretical results of which helped us to rationalize the very different reactivities observed in both metallocenes.
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Affiliation(s)
- Sonia Bruña
- Departamento de Química Inorgánica, Facultad de Ciencias, Calle Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain. .,Institute for Advanced Research in Chemical Sciences (IAdChem), Facultad de Ciencias, Calle Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
| | - Antonio Valverde-González
- Departamento de Química Inorgánica, Facultad de Ciencias, Calle Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.
| | - M Merced Montero-Campillo
- Departamento de Química, Facultad de Ciencias, Calle Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
| | - Otilia Mó
- Institute for Advanced Research in Chemical Sciences (IAdChem), Facultad de Ciencias, Calle Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain.,Departamento de Química, Facultad de Ciencias, Calle Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
| | - Isabel Cuadrado
- Departamento de Química Inorgánica, Facultad de Ciencias, Calle Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain. .,Institute for Advanced Research in Chemical Sciences (IAdChem), Facultad de Ciencias, Calle Francisco Tomás y Valiente, 7, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
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Santi S, Biondi B, Cardena R, Bisello A, Schiesari R, Tomelleri S, Crisma M, Formaggio F. Helical versus Flat Bis-Ferrocenyl End-Capped Peptides: The Influence of the Molecular Skeleton on Redox Properties. Molecules 2022; 27:6128. [PMID: 36144860 PMCID: PMC9503075 DOI: 10.3390/molecules27186128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Revised: 09/07/2022] [Accepted: 09/15/2022] [Indexed: 11/30/2022] Open
Abstract
Despite the fact that peptide conjugates with a pendant ferrocenyl (Fc) have been widely investigated, bis-ferrocenyl end-capped peptides are rarely synthetized. In this paper, in addition to the full characterization of the Fc-CO-[L-Dap(Boc)]n-NH-Fc series, we report a comparison of the three series of bis-ferrocenyl homopeptides synthesized to date, to gain insights into the influence of α-amino isobutyric (Aib), 2,3-diamino propionic (Dap) and Cα,β-didehydroalanine (ΔAla) amino acids on the peptide secondary structure and on the ferrocene redox properties. The results obtained by 2D NMR analysis and X-ray crystal structures, and further supported by electrochemical data, evidence different behaviors depending on the nature of the amino acid; that is, the formation of 310-helices or fully extended (2.05-helix) structures. In these foldamers, the orientation of the carbonyl groups in the peptide helix yields a macrodipole with the positive pole on the N-terminal amino acid and the negative pole on the C-terminal amino acid, so that oxidation of the Fc moieties takes place more or less easily depending on the orientation of the macrodipole moment as the peptide chain grows. Conversely, the fully extended conformation adopted by ΔAla flat peptides neither generates a macrodipole nor affects Fc oxidation. The utilization as electrochemical and optical (Circular Dichroism) probes of the two terminal Fc groups, bound to the same peptide chain, makes it possible to study the end-to-end effects of the positive charges produced by single and double oxidations, and to evidence the presence "exciton-coupled" CD among the two intramolecularly interacting Fc groups of the L-Dap(Boc) series.
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Affiliation(s)
- Saverio Santi
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Barbara Biondi
- Institute of Biomolecular Chemistry, Padova Unit, CNR, Via Marzolo 1, 35131 Padova, Italy
| | - Roberta Cardena
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Annalisa Bisello
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Renato Schiesari
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Silvia Tomelleri
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
| | - Marco Crisma
- Institute of Biomolecular Chemistry, Padova Unit, CNR, Via Marzolo 1, 35131 Padova, Italy
| | - Fernando Formaggio
- Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy
- Institute of Biomolecular Chemistry, Padova Unit, CNR, Via Marzolo 1, 35131 Padova, Italy
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5
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Biondi B, Bisello A, Cardena R, Schiesari R, Facci M, Cerveson L, Rancan M, Formaggio F, Santi S. Conformational Analysis and Through‐Chain Charge Propagation in Ferrocenyl‐Conjugated Homopeptides of 2,3‐Diaminopropionic acid (Dap). Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202100966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Barbara Biondi
- Institute of Biomolecular Chemistry, Padova Unit CNR Via Marzolo 1 35131 Padova Italy
| | - Annalisa Bisello
- Department of Chemical Sciences University of Padova Via Marzolo 1 35131 Padova Italy
| | - Roberta Cardena
- Department of Chemical Sciences University of Padova Via Marzolo 1 35131 Padova Italy
| | - Renato Schiesari
- Department of Chemical Sciences University of Padova Via Marzolo 1 35131 Padova Italy
| | - Martino Facci
- Department of Chemical Sciences University of Padova Via Marzolo 1 35131 Padova Italy
| | - Laura Cerveson
- Department of Chemical Sciences University of Padova Via Marzolo 1 35131 Padova Italy
| | - Marzio Rancan
- Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE) CNR Via Marzolo 1 35131 Padova Italy
| | - Fernando Formaggio
- Institute of Biomolecular Chemistry, Padova Unit CNR Via Marzolo 1 35131 Padova Italy
- Department of Chemical Sciences University of Padova Via Marzolo 1 35131 Padova Italy
| | - Saverio Santi
- Department of Chemical Sciences University of Padova Via Marzolo 1 35131 Padova Italy
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6
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Breimaier S, Fröhlich N, Herberger J, Linseis M, Kivala M, Winter RF. Charge and Spin Delocalization in Mixed-Valent Vinylruthenium–Triarylamine-Conjugates with Planarized Triarylamines. Organometallics 2022. [DOI: 10.1021/acs.organomet.1c00619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stefanie Breimaier
- Department of Chemistry, University of Konstanz, Universitätsstraße 10, D-78457 Konstanz, Germany
| | - Nina Fröhlich
- Department of Chemistry and Pharmacy, Friedrich−Alexander-Universität Erlangen−Nürnberg, Nicolaus-Fiebiger-Straße 10, D-91058 Erlangen, Germany
| | - Jan Herberger
- Department of Chemistry, University of Konstanz, Universitätsstraße 10, D-78457 Konstanz, Germany
| | - Michael Linseis
- Department of Chemistry, University of Konstanz, Universitätsstraße 10, D-78457 Konstanz, Germany
| | - Milan Kivala
- Institute of Organic Chemistry, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Rainer F. Winter
- Department of Chemistry, University of Konstanz, Universitätsstraße 10, D-78457 Konstanz, Germany
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7
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Payami E, Neshad S, Aghaiepour A, Teimuri‐Mofrad R. Novel
meso
‐substituted ferrocene‐appended porphyrins: Synthesis, characterization, and electrochemical evaluation. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6440] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Elmira Payami
- Department of Organic and Biochemistry, Faculty of Chemistry University of Tabriz Tabriz Iran
| | - Saeed Neshad
- Department of Organic and Biochemistry, Faculty of Chemistry University of Tabriz Tabriz Iran
| | - Alireza Aghaiepour
- Department of Organic and Biochemistry, Faculty of Chemistry University of Tabriz Tabriz Iran
| | - Reza Teimuri‐Mofrad
- Department of Organic and Biochemistry, Faculty of Chemistry University of Tabriz Tabriz Iran
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8
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Biondi B, Cardena R, Bisello A, Schiesari R, Cerveson L, Facci M, Rancan M, Formaggio F, Santi S. Flat, Ferrocenyl‐Conjugated Peptides: A Combined Electrochemical and Spectroscopic Study. ChemElectroChem 2021. [DOI: 10.1002/celc.202100597] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Barbara Biondi
- Institute of Biomolecular Chemistry Padova Unit, CNR via Marzolo 1 35131 Padova Italy
| | - Roberta Cardena
- Department of Chemical Sciences University of Padova via Marzolo 1 35131 Padova Italy
| | - Annalisa Bisello
- Department of Chemical Sciences University of Padova via Marzolo 1 35131 Padova Italy
| | - Renato Schiesari
- Department of Chemical Sciences University of Padova via Marzolo 1 35131 Padova Italy
| | - Laura Cerveson
- Department of Chemical Sciences University of Padova via Marzolo 1 35131 Padova Italy
| | - Martino Facci
- Department of Chemical Sciences University of Padova via Marzolo 1 35131 Padova Italy
| | - Marzio Rancan
- Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), CNR Via Marzolo, 1 35131 Padova Italy
| | - Fernando Formaggio
- Institute of Biomolecular Chemistry Padova Unit, CNR via Marzolo 1 35131 Padova Italy
- Department of Chemical Sciences University of Padova via Marzolo 1 35131 Padova Italy
| | - Saverio Santi
- Department of Chemical Sciences University of Padova via Marzolo 1 35131 Padova Italy
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9
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Metzelaars M, Sanz S, Rawson J, Hartmann R, Schneider CM, Kögerler P. Fusing pyrene and ferrocene into a chiral, redox-active triangle. Chem Commun (Camb) 2021; 57:6660-6663. [PMID: 34128505 DOI: 10.1039/d1cc02191e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A macrocycle that integrates three ferrocene-pyrene dyads in a triangular C2-symmetric arrangement is synthesised as a racemate in a simple one-pot approach. Crystal structural analysis reveals two enantiomeric conformers that pack alternatingly via π-π stacking and interconvert dynamically in solution. Electrochemical investigations indicate weak electrostatic interactions between Fc groups upon oxidation to a mixed valence triangle.
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Affiliation(s)
- Marvin Metzelaars
- Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52074, Germany.
| | - Sergio Sanz
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich GmbH, Jülich 52425, Germany
| | - Jeff Rawson
- Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52074, Germany. and Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich GmbH, Jülich 52425, Germany
| | - Rudolf Hartmann
- Institute of Biological Information Processing (IBI-7), Forschungszentrum Jülich GmbH, Jülich 52425, Germany
| | - Claus M Schneider
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich GmbH, Jülich 52425, Germany
| | - Paul Kögerler
- Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52074, Germany. and Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich GmbH, Jülich 52425, Germany
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10
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Nicolini A, Affronte M, SantaLucia DJ, Borsari M, Cahier B, Caleffi M, Ranieri A, Berry JF, Cornia A. Tetrairon(II) extended metal atom chains as single-molecule magnets. Dalton Trans 2021; 50:7571-7589. [PMID: 33983354 PMCID: PMC8214398 DOI: 10.1039/d1dt01007g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iron-based extended metal atom chains (EMACs) are potentially high-spin molecules with axial magnetic anisotropy and thus candidate single-molecule magnets (SMMs). We herein compare the tetrairon(ii), halide-capped complexes [Fe4(tpda)3Cl2] (1Cl) and [Fe4(tpda)3Br2] (1Br), obtained by reacting iron(ii) dihalides with [Fe2(Mes)4] and N2,N6-di(pyridin-2-yl)pyridine-2,6-diamine (H2tpda) in toluene, under strictly anhydrous and anaerobic conditions (HMes = mesitylene). Detailed structural, electrochemical and Mössbauer data are presented along with direct-current (DC) and alternating-current (AC) magnetic characterizations. DC measurements revealed similar static magnetic properties for the two derivatives, with χMT at room temperature above that for independent spin carriers, but much lower at low temperature. The electronic structure of the iron(ii) ions in each derivative was explored by ab initio (CASSCF-NEVPT2-SO) calculations, which showed that the main magnetic axis of all metals is directed close to the axis of the chain. The outer metals, Fe1 and Fe4, have an easy-axis magnetic anisotropy (D = -11 to -19 cm-1, |E/D| = 0.05-0.18), while the internal metals, Fe2 and Fe3, possess weaker hard-axis anisotropy (D = 8-10 cm-1, |E/D| = 0.06-0.21). These single-ion parameters were held constant in the fitting of DC magnetic data, which revealed ferromagnetic Fe1-Fe2 and Fe3-Fe4 interactions and antiferromagnetic Fe2-Fe3 coupling. The competition between super-exchange interactions and the large, noncollinear anisotropies at metal sites results in a weakly magnetic non-Kramers doublet ground state. This explains the SMM behavior displayed by both derivatives in the AC susceptibility data, with slow magnetic relaxation in 1Br being observable even in zero static field.
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Affiliation(s)
- Alessio Nicolini
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia & INSTM, I-41125 Modena, Italy. and Department of Physics, Informatics and Mathematics, University of Modena and Reggio Emilia, I-41125 Modena, Italy
| | - Marco Affronte
- Department of Physics, Informatics and Mathematics, University of Modena and Reggio Emilia, I-41125 Modena, Italy
| | - Daniel J SantaLucia
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
| | - Marco Borsari
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia & INSTM, I-41125 Modena, Italy.
| | - Benjamin Cahier
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Matteo Caleffi
- Department of Physics, Informatics and Mathematics, University of Modena and Reggio Emilia, I-41125 Modena, Italy
| | - Antonio Ranieri
- Department of Life Sciences, University of Modena and Reggio Emilia, I-41125 Modena, Italy
| | - John F Berry
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA
| | - Andrea Cornia
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia & INSTM, I-41125 Modena, Italy.
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11
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Santi S, Bisello A, Cardena R, Tomelleri S, Schiesari R, Biondi B, Crisma M, Formaggio F. Flat, C α,β -Didehydroalanine Foldamers with Ferrocene Pendants: Assessing the Role of α-Peptide Dipolar Moments. Chempluschem 2021; 86:723-730. [PMID: 33825347 DOI: 10.1002/cplu.202100072] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 03/22/2021] [Indexed: 12/28/2022]
Abstract
The foldamer field is continuously expanding as it allows to produce molecules endowed with 3D-structures and functions never observed in nature. We synthesized flat foldamers based on the natural, but non-coded, Cα,β -didehydroalanine α-amino acid, and covalently linked to them two ferrocene (Fc) moieties, as redox probes. These conjugates retain the flat and extended conformation of the 2.05 -helix, both in solution and in the crystal state (X-ray diffraction). Cyclic voltammetry measurements agree with the adoption of the 2.05 -helix, characterized by a negligible dipole moment. Thus, elongated α-peptide stretches of this type are insulators rather than charge conductors, the latter being constituted by peptide α-helices. Also, our homo-tetrapeptide has a N-to-C length of about 18.2 Å, almost double than that (9.7 Å) of an α-helical α-tetrapeptide.
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Affiliation(s)
- Saverio Santi
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Annalisa Bisello
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Roberta Cardena
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Silvia Tomelleri
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Renato Schiesari
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
| | - Barbara Biondi
- Institute of Biomolecular Chemistry, Padova Unit, CNR, via Marzolo 1, 35131, Padova, Italy
| | - Marco Crisma
- Institute of Biomolecular Chemistry, Padova Unit, CNR, via Marzolo 1, 35131, Padova, Italy
| | - Fernando Formaggio
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131, Padova, Italy
- Institute of Biomolecular Chemistry, Padova Unit, CNR, via Marzolo 1, 35131, Padova, Italy
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12
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Palii A, Aldoshin S, Tsukerblat B. Mixed-valence clusters: Prospects for single-molecule magnetoelectrics. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213555] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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Straube A, Coburger P, Michak M, Ringenberg MR, Hey-Hawkins E. The core of the matter - arene substitution determines the coordination and catalytic behaviour of tris(1-phosphanyl-1'-ferrocenylene)arene gold(I) complexes. Dalton Trans 2020; 49:16667-16682. [PMID: 33084677 DOI: 10.1039/d0dt02743j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Changing the aromatic core of C3-symmetric tris(ferrocenyl)arene-based tris-phosphanes has profound effects on their coordination behaviour towards gold(i). Depending on the arene (s-triazine, benzene, or trifluorobenzene), four different coordination modes can be distinguished and their preference has been rationalised using computational methods. The corresponding 1 : 1 ligand-to-metal complexes, studied by variable-temperature NMR spectroscopy, revealed fluctional behaviour in solution. Given the presence of up to three or six ferrocenylene spacers per complex, their electrochemistry was investigated. The redox-responsive nature of the complexes can be advantageously exploited in the catalytic ring-closing isomerisation of N-(2-propyn-1-yl)benzamide, where the benzene-based 2 : 3 ligand-to-metal complex has been shown to display multiple activity states depending on the degree of (reversible) oxidation in a preliminary trial.
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Affiliation(s)
- Axel Straube
- Institute of Inorganic Chemistry, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany.
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Roy SS, Chowdhury SR, Mishra S, Patra SK. Role of Substituents at 3-position of Thienylethynyl Spacer on Electronic Properties in Diruthenium(II) Organometallic Wire-like Complexes. Chem Asian J 2020; 15:3304-3313. [PMID: 32790947 DOI: 10.1002/asia.202000755] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/27/2020] [Indexed: 11/11/2022]
Abstract
A series of organometallic complexes [Cl(dppe)2 Ru-C≡C-(3-R-C4 H2 S)-C≡C-Ru(dppe)2 Cl] (3-R-C4 H2 S=3-substituted thienyl moiety; R=-H, -C2 H5 , -C3 H7 , -C4 H9 , -C6 H13 , -OMe, -CN in 5 a-5 g respectively) have been synthesized by systematic variation of 3-substituents at the thienylethynyl bridging unit. The diruthenum(II) wire-like complexes (5 a-5 g) have been achieved by the reaction of thienylethynyl bridging units, HC≡C-(3-R-C4 H2 S)-C≡CH (4 a-4 g) with cis-[Ru(dppe)2 Cl2 ]. The wire-like diruthenium(II) complexes undergo two consecutive electrochemical oxidation processes in the potential range of 0.0 - 0.8 V. Interestingly, the wave separation between the two redox waves is greatly influenced by the substituents at the 3-position of the thienylethynyl. Thus, the substitution on 3-position of the thienylethynyl bridging unit plays a pivotal role for tuning the electronic properties. To understand the electronic behavior, density functional theory (DFT) calculations of the selected diruthenium wire-like complexes (5 a-5 e) with different alkyl appendages are performed. The theoretical data demonstrate that incorporation of alkyl groups to the thienylethynyl entity leaves unsymmetrical spin densities, thus affecting the electronic properties. The voltammetric features of the other two Ru(II) alkynyl complexes 5 f and 5 g (with -OMe and -CN group respectively) show an apparent dependence on the electronic properties. The electronic properties in the redox conjugate, (5 a+ ) with Kc of 3.9×106 are further examined by UV-Vis-NIR and FTIR studies, showing optical responses in NIR region along with changes in "-Ru-C≡C-" vibrational stretching frequency. The origin of the observed electronic transition has been assigned based on time-dependent DFT (TDDFT) calculations.
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Affiliation(s)
- Sourav Saha Roy
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, WB, India
| | | | - Sabyashachi Mishra
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, WB, India
| | - Sanjib K Patra
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, WB, India
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15
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Straube A, Coburger P, Dütsch L, Hey-Hawkins E. Triple the fun: tris(ferrocenyl)arene-based gold(i) complexes for redox-switchable catalysis. Chem Sci 2020; 11:10657-10668. [PMID: 34094320 PMCID: PMC8162263 DOI: 10.1039/d0sc03604h] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The modular syntheses of C3-symmetric tris(ferrocenyl)arene-based tris-phosphanes and their homotrinuclear gold(i) complexes are reported. Choosing the arene core allows fine-tuning of the exact oxidation potentials and thus tailoring of the electrochemical response. The tris[chloridogold(i)] complexes were investigated in the catalytic ring-closing isomerisation of N-(2-propyn-1-yl)benzamide, showing cooperative behaviour vs. a mononuclear chloridogold(i) complex. Adding one, two, or three equivalents of 1,1′-diacetylferrocenium[tetrakis(perfluoro-tert-butoxy)aluminate] as an oxidant during the catalytic reaction (in situ) resulted in a distinct, stepwise influence on the resulting catalytic rates. Isolation of the oxidised species is possible, and using them as (pre-)catalysts (ex situ oxidation) confirmed the activity trend. Proving the intactness of the P–Au–Cl motif during oxidation, the tri-oxidised benzene-based complex has been structurally characterised. Trinuclear gold(i) complexes of C3-symmetric tris(ferrocenyl)arene-based tris-phosphanes with four accessible oxidation states catalyse the ring-closing isomerisation of N-(2-propyn-1-yl)benzamide with different rates depending on their redox state.![]()
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Affiliation(s)
- Axel Straube
- Institute of Inorganic Chemistry, Universität Leipzig Johannisallee 29 D-04103 Leipzig Germany https://anorganik.chemie.unileipzig.de/de/anorganik/ak-hey-hawkins/
| | - Peter Coburger
- Institute of Inorganic Chemistry, Universität Leipzig Johannisallee 29 D-04103 Leipzig Germany https://anorganik.chemie.unileipzig.de/de/anorganik/ak-hey-hawkins/
| | - Luis Dütsch
- Institute of Inorganic Chemistry, Universität Regensburg Universitätsstr. 31 D-93053 Regensburg Germany
| | - Evamarie Hey-Hawkins
- Institute of Inorganic Chemistry, Universität Leipzig Johannisallee 29 D-04103 Leipzig Germany https://anorganik.chemie.unileipzig.de/de/anorganik/ak-hey-hawkins/
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16
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Ou Y, Wang A, Yuan A, Yin C, Hu F. Phenyl‐Bridged Ferrocene/Ruthenium Alkynyl Heterobimetallic Complexes: Syntheses, Characterization, and Electrochemical, Spectroscopic, and Computational Investigation. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Ya‐Ping Ou
- College of Chemistry and Material Science Hengyang Normal University Key Laboratory of Functional Metal‐Organic Compounds of Hunan Province Key Laboratory of Functional Organometallic Materials of Hunan Province College Hengyang Hunan 421008 P.R. China
| | - Aihui Wang
- College of Chemistry and Material Science Hengyang Normal University Key Laboratory of Functional Metal‐Organic Compounds of Hunan Province Key Laboratory of Functional Organometallic Materials of Hunan Province College Hengyang Hunan 421008 P.R. China
| | - Ande Yuan
- College of Chemistry and Material Science Hengyang Normal University Key Laboratory of Functional Metal‐Organic Compounds of Hunan Province Key Laboratory of Functional Organometallic Materials of Hunan Province College Hengyang Hunan 421008 P.R. China
| | - Chuang Yin
- College of Chemistry and Material Science Hengyang Normal University Key Laboratory of Functional Metal‐Organic Compounds of Hunan Province Key Laboratory of Functional Organometallic Materials of Hunan Province College Hengyang Hunan 421008 P.R. China
| | - Fang Hu
- Faculty of Materials Science and Chemical Engineering Ningbo University 315211 Ningbo China
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17
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Petrov AV, Zagidullin AA, Bezkishko IA, Khrizanforov MN, Kholin KV, Gerasimova TP, Ivshin KA, Shekurov RP, Katsyuba SA, Kataeva ON, Budnikova YH, Miluykov VA. Synthesis, structure, and electrochemical properties of 4,5-diaryl-1,2,3-triphosphaferrocenes and the first example of multi(phosphaferrocene). Dalton Trans 2020; 49:17252-17262. [DOI: 10.1039/d0dt03281f] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Novel 1,2,3-triphosphaferrocenes have been extensively studied experimentally (NMR, UV-Vis, and X-ray) and quantum chemically.
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18
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Tahara K, Terashita N, Tokunaga K, Yabumoto S, Kikuchi JI, Ozawa Y, Abe M. Zwitterionic Mixed Valence: Internalizing Counteranions into a Biferrocenium Framework toward Molecular Expression of Half-Cells in Quantum Cellular Automata. Chemistry 2019; 25:13728-13738. [PMID: 31376186 DOI: 10.1002/chem.201902840] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 07/26/2019] [Indexed: 01/26/2023]
Abstract
Realization of molecular quantum cellular automata (QCA), a promising architecture for molecular computing through current-free processes, requires improved understanding and application of mixed-valence (MV) molecules. In this report, we present an electrostatic approach to creating MV subspecies through internalizing opposite charges in close proximity to MV ionic moieties. This approach is demonstrated by unsymmetrically attaching a charge-responsive boron substituent to a well-known organometallic MV complex, biferrocenium. Guest anions (CN- and F- ) bind to the Lewis acidic boron center, leading to unusual blue-shifts of the intervalence charge-transfer (IVCT) bands. To the best of our knowledge, this is the first reported example of a zwitterionic MV series in which the degree of positive charge delocalization can be varied by changing the bound anions, and serves to clarify the interplay between IVCT parameters. The key underlying factor is the variable zero-level energy difference in the MV states. This work provides new insight into imbuing MV molecules with external charge-responsiveness, a prerequisite of molecular QCA techniques.
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Affiliation(s)
- Keishiro Tahara
- Department of Material Science, Graduate School of Material Science, University of Hyogo, 3-2-1, Kouto, Kamigori, Ako, Hyogo, 678-1297, Japan
| | - Nazuna Terashita
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama, Ikoma, Nara, 630-0192, Japan
| | - Ken Tokunaga
- Division of Liberal Arts, Centre for Promotion of Higher Education, Kogakuin University, 2665-1, Nakano, Hachioji, Tokyo, 192-0015, Japan
| | - Shiomi Yabumoto
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama, Ikoma, Nara, 630-0192, Japan
| | - Jun-Ichi Kikuchi
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama, Ikoma, Nara, 630-0192, Japan
| | - Yoshiki Ozawa
- Department of Material Science, Graduate School of Material Science, University of Hyogo, 3-2-1, Kouto, Kamigori, Ako, Hyogo, 678-1297, Japan
| | - Masaaki Abe
- Department of Material Science, Graduate School of Material Science, University of Hyogo, 3-2-1, Kouto, Kamigori, Ako, Hyogo, 678-1297, Japan
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19
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Hashimoto A, Yoshinari N, Nakano M, Konno T. Counter‐Anion‐Regulated Mixed‐Valency of Cobalt(II/III) Centers in a Metallosupramolecular Framework. Chem Asian J 2019; 14:4013-4016. [DOI: 10.1002/asia.201900743] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Akari Hashimoto
- Department of Chemistry Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan
| | - Nobuto Yoshinari
- Department of Chemistry Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan
| | - Motohiro Nakano
- Department of Chemistry Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan
| | - Takumi Konno
- Department of Chemistry Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan
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Roy SS, Patra SK. Synthesis and Characterization of Diferrocenyl Conjugates: Varying π-Conjugated Bridging Ligands and its Consequence on Electrochemical Communication. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900114] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Sourav Saha Roy
- Department of Chemistry; Indian Institute of Technology Kharagpur; 721302 Kharagpur India
| | - Sanjib K. Patra
- Department of Chemistry; Indian Institute of Technology Kharagpur; 721302 Kharagpur India
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21
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Hassenrück C, Mang A, Winter RF. Mixed-Valent Ruthenocene–Vinylruthenium Conjugates: Valence Delocalization Despite Chemically Different Redox Sites. Inorg Chem 2019; 58:2695-2707. [DOI: 10.1021/acs.inorgchem.8b03253] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christopher Hassenrück
- University of Konstanz, Department of Chemistry, Universitätsstraße 10, 78457 Konstanz, Germany
| | - André Mang
- University of Konstanz, Department of Chemistry, Universitätsstraße 10, 78457 Konstanz, Germany
| | - Rainer F. Winter
- University of Konstanz, Department of Chemistry, Universitätsstraße 10, 78457 Konstanz, Germany
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22
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Synthesis of new star-like triply ferrocenylated compounds. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.10.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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23
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Sil A, Ghosh U, Mishra VK, Mishra S, Patra SK. Synthesis, Structure, Electrochemical, and Spectroscopic Properties of Hetero-Bimetallic Ru(II)/Fe(II)-Alkynyl Organometallic Complexes. Inorg Chem 2019; 58:1155-1166. [PMID: 30614701 DOI: 10.1021/acs.inorgchem.8b02440] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amit Sil
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, West Bengal, India
| | - Utsav Ghosh
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, West Bengal, India
| | - Vipin Kumar Mishra
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, West Bengal, India
| | - Sabyashachi Mishra
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, West Bengal, India
| | - Sanjib K. Patra
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, West Bengal, India
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24
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Rossi S, Bisello A, Cardena R, Santi S. Testing the Conjugative Properties of Benzodithiophene and Benzotrithiophene in Charge Transfer Multi(ferrocenyl) Systems. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00537] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Serena Rossi
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy
| | - Annalisa Bisello
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy
| | - Roberta Cardena
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy
| | - Saverio Santi
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy
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25
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Saha Roy S, Sil A, Giri D, Roy Chowdhury S, Mishra S, Patra SK. Diruthenium(ii)-capped oligothienylethynyl bridged highly soluble organometallic wires exhibiting long-range electronic coupling. Dalton Trans 2018; 47:14304-14317. [PMID: 29967914 DOI: 10.1039/c8dt01818a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Organometallic molecular wires with π-conjugation along their molecular backbones are of considerable interest for application in molecular-scale electronics. In this regard, thienylethynyl-based π-conjugated oligomers of three, five and seven thienylethynyl units with -C[triple bond, length as m-dash]C-H termini have been successfully synthesized through stepwise Pd(0)/Cu(i)-catalyzed Sonogashira coupling. The corresponding highly soluble diruthenium(ii) diacetylide complexes (O1-Ru2, O3-Ru2, O5-Ru2 and O7-Ru2, respectively) have been prepared by the reaction of cis-Ru(dppe)2Cl2 and NaPF6 in DCM with the corresponding rigid rod-like thienylethynyl oligomers with one, three, five and seven thienylethynyl π-conjugated segments containing alkynyl termini (O1, O3, O5 and O7). These Ru(ii)-Cl capped diacetylide complexes have been further functionalized by incorporating a phenylacetynyl moiety to afford [Ru(ii)-C[triple bond, length as m-dash]C-Ph]-capped diacetylide organometallic wires (O1-Ru2-Ph, O3-Ru2-Ph, O5-Ru2-Ph and O7-Ru2-Ph). The photophysical properties of the highly soluble thienylethynyl-based oligomers and Ru(ii)-organometallic wires have been explored to understand their electronic properties. Electrochemical studies of the binuclear ruthenium(ii)-alkynyl complexes showed highly interesting results, revealing long-range electrochemical communication between the two remote Ru(ii) termini connected even with five and seven thienylethynyl units. DFT computational studies further support the long range electrochemical communication between the redox active metal termini through heavy participation of the thienylethynyl bridge in the corresponding mono-oxidized mixed valence species of the organometallic wire-like complexes.
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Affiliation(s)
- Sourav Saha Roy
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur-721302, WB, India.
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27
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Nicolini A, Galavotti R, Barra AL, Borsari M, Caleffi M, Luo G, Novitchi G, Park K, Ranieri A, Rigamonti L, Roncaglia F, Train C, Cornia A. Filling the Gap in Extended Metal Atom Chains: Ferromagnetic Interactions in a Tetrairon(II) String Supported by Oligo-α-pyridylamido Ligands. Inorg Chem 2018; 57:5438-5448. [PMID: 29668273 DOI: 10.1021/acs.inorgchem.8b00405] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stringlike complex [Fe4(tpda)3Cl2] (2; H2tpda = N2, N6-bis(pyridin-2-yl)pyridine-2,6-diamine) was obtained as the first homometallic extended metal atom chain based on iron(II) and oligo-α-pyridylamido ligands. The synthesis was performed under strictly anaerobic and anhydrous conditions using dimesityliron, [Fe2(Mes)4] (1; HMes = mesitylene), as both an iron source and a deprotonating agent for H2tpda. The four lined-up iron(II) ions in the structure of 2 (Fe···Fe = 2.94-2.99 Å, Fe···Fe···Fe = 171.7-168.8°) are wrapped by three doubly deprotonated twisted ligands, and the chain is capped at its termini by two chloride ions. The spectroscopic and electronic properties of 2 were investigated in dichloromethane by UV-vis-NIR absorption spectroscopy, 1H NMR spectroscopy, and cyclic voltammetry. The electrochemical measurements showed four fully resolved, quasi-reversible one-electron-redox processes, implying that 2 can adopt five oxidation states in a potential window of only 0.8 V. Direct current (dc) magnetic measurements indicate dominant ferromagnetic coupling at room temperature, although the ground state is only weakly magnetic. On the basis of density functional theory and angular overlap model calculations, this magnetic behavior was explained as being due to two pairs of ferromagnetically coupled iron(II) ions ( J = -21 cm-1 using JŜ i·Ŝ j convention) weakly antiferromagnetically coupled with each other. Alternating-current susceptibility data in the presence of a 2 kOe dc field and at frequencies up to 1.5 kHz revealed the onset of slow magnetic relaxation below 2.8 K, with the estimated energy barrier Ueff/ kB = 10.1(1.3) K.
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Affiliation(s)
- Alessio Nicolini
- Department of Chemical and Geological Sciences , University of Modena and Reggio Emilia & INSTM , I-41125 Modena , Italy.,Department of Physics, Informatics and Mathematics , University of Modena and Reggio Emilia , I-41125 Modena , Italy
| | - Rita Galavotti
- Department of Chemical and Geological Sciences , University of Modena and Reggio Emilia & INSTM , I-41125 Modena , Italy
| | - Anne-Laure Barra
- Laboratoire National des Champs Magnétiques Intenses-CNRS , Université Grenoble-Alpes , F-38042 Grenoble Cedex 9 , France
| | - Marco Borsari
- Department of Chemical and Geological Sciences , University of Modena and Reggio Emilia & INSTM , I-41125 Modena , Italy
| | - Matteo Caleffi
- Department of Chemical and Geological Sciences , University of Modena and Reggio Emilia & INSTM , I-41125 Modena , Italy
| | - Guangpu Luo
- Department of Physics , Virginia Tech , Blacksburg , Virginia 24061 , United States
| | - Ghenadie Novitchi
- Laboratoire National des Champs Magnétiques Intenses-CNRS , Université Grenoble-Alpes , F-38042 Grenoble Cedex 9 , France
| | - Kyungwha Park
- Department of Physics , Virginia Tech , Blacksburg , Virginia 24061 , United States
| | - Antonio Ranieri
- Department of Life Sciences , University of Modena and Reggio Emilia , I-41125 Modena , Italy
| | - Luca Rigamonti
- Department of Chemical and Geological Sciences , University of Modena and Reggio Emilia & INSTM , I-41125 Modena , Italy
| | - Fabrizio Roncaglia
- Department of Chemical and Geological Sciences , University of Modena and Reggio Emilia & INSTM , I-41125 Modena , Italy
| | - Cyrille Train
- Laboratoire National des Champs Magnétiques Intenses-CNRS , Université Grenoble-Alpes , F-38042 Grenoble Cedex 9 , France
| | - Andrea Cornia
- Department of Chemical and Geological Sciences , University of Modena and Reggio Emilia & INSTM , I-41125 Modena , Italy
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Fink D, Bodensteiner M, Linseis M, Winter RF. Macrocyclic Triruthenium Complexes Having Electronically Coupled Mixed-Valent States. Chemistry 2018; 24:992-996. [PMID: 29095542 DOI: 10.1002/chem.201705143] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Indexed: 11/09/2022]
Abstract
5-Ethynyl-2-furancarboxylic acid and 3-ethynylbenzoic acid self-assemble with [HRu(CO)Cl(PiPr3 )2 ] to form macrocyclic C3 -symmetric triangular triruthenium alkenyl complexes [{Ru(CO)(PiPr3 )2 (CH=CHArCOO)}3 ] (Ar=C6 H4 : 1-B, Ar=C4 H2 O: 1-F), which were characterized by multinuclear NMR spectroscopy, high-resolution ESI mass spectrometry, and, in the case of 1-B, by X-ray crystallography. Electrochemical studies indicate that the macrocycles are oxidized in three consecutive one-electron steps. The mixed-valent states obtained by electrochemical or chemical oxidation show signs of valence delocalization, which makes these complexes rare examples of molecule-based conductive loops with through-bond charge delocalization.
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Affiliation(s)
- Daniel Fink
- Fachbereich Chemie, Universität Konstanz, Universitätsstrasse 10, 78457, Konstanz, Germany
| | - Michael Bodensteiner
- Fachbereich Chemie und Pharmazie, Universität Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany
| | - Michael Linseis
- Fachbereich Chemie, Universität Konstanz, Universitätsstrasse 10, 78457, Konstanz, Germany
| | - Rainer F Winter
- Fachbereich Chemie und Pharmazie, Universität Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany
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Hazari AS, Indra A, Lahiri GK. Mixed valency in ligand-bridged diruthenium frameworks: divergences and perspectives. RSC Adv 2018; 8:28895-28908. [PMID: 35547993 PMCID: PMC9084559 DOI: 10.1039/c8ra03206h] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Accepted: 08/01/2018] [Indexed: 11/21/2022] Open
Abstract
Emerging fundamental issues involving intramolecular electron transfer at the mixed valent diruthenium frameworks and its application prospects have been highlighted.
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Affiliation(s)
| | - Arindam Indra
- Department of Chemistry
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi
- India
| | - Goutam Kumar Lahiri
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076
- India
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31
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Rossi S, Bisello A, Cardena R, Orian L, Santi S. Benzodithiophene and Benzotrithiophene as π Cores for Two- and Three-Blade Propeller-Shaped Ferrocenyl-Based Conjugated Systems. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701045] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Serena Rossi
- Department of Chemical Sciences; University of Padova; Via Marzolo 1 35131 Padova Italy
| | - Annalisa Bisello
- Department of Chemical Sciences; University of Padova; Via Marzolo 1 35131 Padova Italy
| | - Roberta Cardena
- Department of Chemical Sciences; University of Padova; Via Marzolo 1 35131 Padova Italy
| | - Laura Orian
- Department of Chemical Sciences; University of Padova; Via Marzolo 1 35131 Padova Italy
| | - Saverio Santi
- Department of Chemical Sciences; University of Padova; Via Marzolo 1 35131 Padova Italy
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32
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Hassenrück C, Winter RF. Manipulation and Assessment of Charge and Spin Delocalization in Mixed-Valent Triarylamine–Vinylruthenium Conjugates. Inorg Chem 2017; 56:13517-13529. [PMID: 29035518 DOI: 10.1021/acs.inorgchem.7b02186] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Rainer F. Winter
- University of Konstanz, Universitätsstraße 10, D-78457 Konstanz, Germany
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33
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Yáñez-S M, Moya SA, Zúñiga C, Cárdenas-Jirón G. Theoretical assessment of TD-DFT applied to a ferrocene-based complex. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.08.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bruña S, González-Vadillo AM, Ferrández M, Perles J, Montero-Campillo MM, Mó O, Cuadrado I. Formation of unexpected silicon- and disiloxane-bridged multiferrocenyl derivatives bearing Si-O-CH[double bond, length as m-dash]CH 2 and Si-(CH 2) 2C(CH 3) 3 substituents via cleavage of tetrahydrofuran and trapping of its ring fragments. Dalton Trans 2017; 46:11584-11597. [PMID: 28766631 DOI: 10.1039/c7dt02286g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The formation of a family of silicon- and siloxane-bridged multiferrocenyl derivatives carrying different functional groups attached to silicon, including Fc2(CH3)3C(CH2)2SiCH[double bond, length as m-dash]CH2 (5), Fc2(CH2[double bond, length as m-dash]CH-O)SiCH[double bond, length as m-dash]CH2 (6), Fc2(OH)SiCH[double bond, length as m-dash]CH2 (7), Fc2(CH2[double bond, length as m-dash]CH-O)Si-O-Si(O-CH[double bond, length as m-dash]CH2)Fc2 (8) and Fc2(CH2[double bond, length as m-dash]CH-O)Si-O-SiFc3 (9) is described. Silyl vinyl ether molecules 6, 8 and 9 and the heteroleptic vinylsilane 5 resulted from the competing metathesis reaction of lithioferrocene (FcLi), CH2[double bond, length as m-dash]CH-OLi or (CH3)3C(CH2)2Li with the corresponding multifunctional chlorosilane, Cl3SiCH[double bond, length as m-dash]CH2 or Cl3Si-O-SiCl3. The last two organolithium species have been likely formed in situ by fragmentation of the tetrahydrofuran solvent. Diferrocenylvinyloxyvinylsilane 6 is noteworthy since it represents a rare example of a redox-active silyl mononomer in which two different C[double bond, length as m-dash]C polymerisable groups are directly connected to silicon. The molecular structures of the silicon-containing multiferrocenyl species 5, 6, 8 and 9 have been investigated by single-crystal X-ray diffraction studies, demonstrating the capture and storage processes of two ring fragments resulting from the cleavage of cyclic THF in redox-active and stable crystalline organometallic compounds. From electrochemical studies we found that by changing the anion of the supporting electrolyte from [PF6]- to [B(C6F5)4]-, the redox behaviour of tetrametallic disiloxane 8 can be switched from a poorly resolved multistep redox process to four consecutive well-separated one-electron oxidations, corresponding to the sequential oxidation of the four ferrocenyl moieties.
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Affiliation(s)
- Sonia Bruña
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain. and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Spain
| | - Ana Mª González-Vadillo
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
| | - Marta Ferrández
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
| | - Josefina Perles
- Laboratorio de Difracción de Rayos X de Monocristal, Servicio Interdepartamental de Investigación (SIDI), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - M Merced Montero-Campillo
- Departamento de Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Otilia Mó
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Spain and Departamento de Química, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Isabel Cuadrado
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain. and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Spain
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35
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Possanza F, Vecchi A, Conte V, Floris B, Galloni P. 5,10,15,20-Tetrakis(1′-acetylferrocenyl)porphyrin: Electronic and structural effects of acetyl group on TFcP. J PORPHYR PHTHALOCYA 2017. [DOI: 10.1142/s1088424617500468] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Synthesis of tetrasubstituted-tetraferrocenylporphyrins containing an acetyl functional group on all ferrocenyl moiety has been performed, allowing the analysis of the effects of these groups in terms of geometry and electronic distribution. TFcPs exhibit interesting electrochemical properties, mostly due to electronic communication between the ferrocenyl substituents and the porphyrin core and the presence of four acetyl substituents do not affect significantly these properties. Nevertheless the functionalization leads to a more defined electronic transition, in particular in the Q region and a more stable TFcP in terms of chemical oxidation. This can openinig the way to modulate and/or improve the performance of TFcP in various applications.
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Affiliation(s)
- Fabio Possanza
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, via Della Ricerca Scientifica snc, 00133 Rome, Italy
| | - Andrea Vecchi
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, via Della Ricerca Scientifica snc, 00133 Rome, Italy
| | - Valeria Conte
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, via Della Ricerca Scientifica snc, 00133 Rome, Italy
| | - Barbara Floris
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, via Della Ricerca Scientifica snc, 00133 Rome, Italy
| | - Pierluca Galloni
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, via Della Ricerca Scientifica snc, 00133 Rome, Italy
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Bisello A, Cardena R, Rossi S, Crisma M, Formaggio F, Santi S. Hydrogen-Bond-Assisted, Concentration-Dependent Molecular Dimerization of Ferrocenyl Hydantoins. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00248] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Annalisa Bisello
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Roberta Cardena
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Serena Rossi
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Marco Crisma
- Institute
of Biomolecular Chemistry, Padova Unit, CNR, via Marzolo 1, 35131 Padova, Italy
| | - Fernando Formaggio
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Saverio Santi
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
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37
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Zatsikha YV, Holstrom CD, Chanawanno K, Osinski AJ, Ziegler CJ, Nemykin VN. Observation of the Strong Electronic Coupling in Near-Infrared-Absorbing Tetraferrocene aza-Dipyrromethene and aza-BODIPY with Direct Ferrocene−α- and Ferrocene−β-Pyrrole Bonds: Toward Molecular Machinery with Four-Bit Information Storage Capacity. Inorg Chem 2017; 56:991-1000. [DOI: 10.1021/acs.inorgchem.6b02806] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuriy V. Zatsikha
- Department of Chemistry & Biochemistry, University of Minnesota Duluth, Duluth, Minnesota 55812, United States
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Cole D. Holstrom
- Department of Chemistry & Biochemistry, University of Minnesota Duluth, Duluth, Minnesota 55812, United States
| | - Kullapa Chanawanno
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Allen J. Osinski
- Department of Chemistry, University of Akron, Akron, Ohio 44325, United States
| | | | - Victor N. Nemykin
- Department of Chemistry & Biochemistry, University of Minnesota Duluth, Duluth, Minnesota 55812, United States
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
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38
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Lu F, Harms K. Electrochemistry of Dinuclear Organometallic [5]Trovacenyl Derivatives Bridged by Group 14 Elements (Si, Ge, Sn, Pb). Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601045] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Feng Lu
- Fachbereich Chemie Philipps‐Universität Marburg 35032 Marburg Germany
| | - Klaus Harms
- Fachbereich Chemie Philipps‐Universität Marburg 35032 Marburg Germany
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39
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Duan XE, Li R, Tong HB, Li YQ, Bai SD, Guo YJ, Liu DS. Synthesis and structural characterization of electrochemically reversible bisferrocenes containing bis(acyl-thiourea)s: enantiomers and conformers. NEW J CHEM 2017. [DOI: 10.1039/c6nj03539f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Enantiomeric and conformational isomers of chiral bisferrocenyl-modified bis(acyl-thiourea)s; their crystal packing and electrochemically reversible redox reaction properties.
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Affiliation(s)
- Xin-E Duan
- School of Chemistry and Chemical Engineering
- Shanxi University
- Taiyuan
- P. R. China
| | - Rui Li
- School of Chemistry and Chemical Engineering
- Shanxi University
- Taiyuan
- P. R. China
- Institute of Applied Chemistry
| | - Hong-Bo Tong
- Institute of Applied Chemistry
- Shanxi University
- Taiyuan 030006
- P. R. China
| | - Ying-Qi Li
- School of Chemistry and Chemical Engineering
- Shanxi University
- Taiyuan
- P. R. China
| | - Sheng-Di Bai
- Institute of Applied Chemistry
- Shanxi University
- Taiyuan 030006
- P. R. China
| | - Yu-Jing Guo
- Institute of Environmental Science
- Shanxi University
- Taiyuan 030006
- P. R. China
| | - Dian-Sheng Liu
- Institute of Applied Chemistry
- Shanxi University
- Taiyuan 030006
- P. R. China
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40
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Electrochemical study of azide bridged heterobimetallic films of porphyrins: Application as an impedimetric sensor. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.11.161] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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41
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Wilson LE, Hassenrück C, Winter RF, White AJP, Albrecht T, Long NJ. Functionalised Biferrocene Systems towards Molecular Electronics. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201601036] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lucy E. Wilson
- Department of Chemistry; Imperial College London; South Kensington London UK
| | | | - Rainer F. Winter
- Fachbereich Chemie; Universität Konstanz; Universitätsstraße 10 Konstanz Germany
| | - Andrew J. P. White
- Department of Chemistry; Imperial College London; South Kensington London UK
| | - Tim Albrecht
- Department of Chemistry; Imperial College London; South Kensington London UK
| | - Nicholas J. Long
- Department of Chemistry; Imperial College London; South Kensington London UK
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42
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Synthesis and electrochemistry property of new crowded multi-ferrocenyl substituted benzene derivatives. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.07.036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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43
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Synthesis, structure and NLO properties of a 1,3,5-substituted tricationic cobaltocenium benzene complex. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.07.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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45
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Scheerer S, Linseis M, Wuttke E, Weickert S, Drescher M, Tröppner O, Ivanović-Burmazović I, Irmler A, Pauly F, Winter RF. Redox-Active Tetraruthenium Macrocycles Built from 1,4-Divinylphenylene-Bridged Diruthenium Complexes. Chemistry 2016; 22:9574-90. [PMID: 27270860 DOI: 10.1002/chem.201601384] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Indexed: 11/09/2022]
Abstract
Metallamacrocylic tetraruthenium complexes were generated by treatment of 1,4-divinylphenylene-bridged diruthenium complexes with functionalized 1,3-benzene dicarboxylic acids and characterized by HR ESI-MS and multinuclear NMR spectroscopy. Every divinylphenylene diruthenium subunit is oxidized in two consecutive one-electron steps with half-wave potential splittings in the range of 250 to 330 mV. Additional, smaller redox-splittings between the +/2+ and 0/+ and the 3+/4+ and 2+/3+ redox processes, corresponding to the first and the second oxidations of every divinylphenylene diruthenium entity, are due to electrostatic effects. The lack of electronic coupling through bond or through space is explained by the nodal properties of the relevant molecular orbitals and the lateral side-by-side arrangement of the divinylphenylene linkers. The polyelectrochromic behavior of the divinylphenylene diruthenium precursors is retained and even amplified in these metallamacrocyclic structures. EPR studies down to T=4 K indicate that the dications 1-H(2+) and 1-OBu(2+) are paramagnetic. The dications and the tetracation of macrocycle 3-H display intense (dications) or weak (3-H(4+) ) EPR signals. Quantum chemical calculations indicate that the four most stable conformers of the macrocycles are largely devoid of strain. Bond parameters, energies as well as charge and spin density distributions of model macrocycle 5-H(Me) were calculated for the different charge and spin states.
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Affiliation(s)
- Stefan Scheerer
- Fachbereich Chemie, Universität Konstanz, Universitätsstraße 10, 78457, Konstanz, Germany
| | - Michael Linseis
- Fachbereich Chemie, Universität Konstanz, Universitätsstraße 10, 78457, Konstanz, Germany
| | - Evelyn Wuttke
- Fachbereich Chemie, Universität Konstanz, Universitätsstraße 10, 78457, Konstanz, Germany.,Boehringer Ingelheim Pharma GmbH & CO. KG, Birkendorfer Straße 65, 88397, Biberach a. d. Riß, Germany
| | - Sabrina Weickert
- Fachbereich Chemie, Universität Konstanz, Universitätsstraße 10, 78457, Konstanz, Germany
| | - Malte Drescher
- Fachbereich Chemie, Universität Konstanz, Universitätsstraße 10, 78457, Konstanz, Germany
| | - Oliver Tröppner
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058, Erlangen, Germany
| | - Ivana Ivanović-Burmazović
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 1, 91058, Erlangen, Germany
| | - Andreas Irmler
- Fachbereich Physik, Universität Konstanz, Universitätsstraße 10, 78457, Konstanz, Germany
| | - Fabian Pauly
- Fachbereich Physik, Universität Konstanz, Universitätsstraße 10, 78457, Konstanz, Germany.
| | - Rainer F Winter
- Fachbereich Chemie, Universität Konstanz, Universitätsstraße 10, 78457, Konstanz, Germany.
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46
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Colic V, Pohl MD, Scieszka D, Bandarenka AS. Influence of the electrolyte composition on the activity and selectivity of electrocatalytic centers. Catal Today 2016. [DOI: 10.1016/j.cattod.2015.08.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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Pillay MN, van der Walt H, Staples RJ, van Zyl WE. C/O/P/S cycles derived from oxidative intramolecular disulfide (–S–S–) coupling of ferrocenyl dithiophosphonates. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.05.052] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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48
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Donoli A, Bisello A, Cardena R, Crisma M, Orian L, Santi S. Charge Transfer Properties of Benzo[b]thiophene Ferrocenyl Complexes. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00191] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alessandro Donoli
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Annalisa Bisello
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Roberta Cardena
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Marco Crisma
- Institute
of Biomolecular Chemistry, Padova Unit, CNR, via Marzolo 1, 35131 Padova, Italy
| | - Laura Orian
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Saverio Santi
- Department
of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
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