Key words
(English)
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Tetrathiafulvalene (TTF); redox-activity; macrocycles; TTF-Phthalocyanine; supramolecular complexes; bio-materials
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Research programs
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COST-Action D31 - Organising Non-Covalent Chemical Systems with Selected Functions
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Short description
(English)
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Tetrathiafulvalene (TTF), a redox-active molecular unit, is taken as a building block to realize complex macrocyclic systems. Specifically, TTF-annulated macrocycles (N3S2), TTF-annulated-Phthalocyanines and TTF-based biomaterials (with Peptide strands) will be synthesized and investigated. The properties are correlated with the crystalline solid state as well as with the structures within the nano-regime.
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Further information
(English)
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Full name of research-institution/enterprise: Universität Bern Departement für Chemie und Biochemie
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Partners and International Organizations
(English)
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AT, BE, CH, CZ, DE, DK, ES, FI, FR, GR, HR, HU, IL, IT, LT, NL, NO, PL, PT, SE, SI, UK
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Abstract
(English)
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Within the about 3 years of the project duration, a total of 16 publications (5 in 2006, 5 in 2007, 5 in 2008 and 1 in 2009) where this COST project got essentially involved, can be listed. In full accordance with the outline of the research project, a broad range of redox-active supramolecular systems, mostly based on tetrathiafulvalene (TTF) donors, has been synthesized and characterized. Combined with appropriate electron accepting groups, such novel electron donor-acceptor compounds are good candidates for being probed in the field of molecular electronics. Importantly, some of these fused molecular systems reach a low HOMO-LUMO gap (means the energy difference of the frontier molecular orbitals) of about 0.5 eV, only. This property facilitates especially the electron/hole mobility through such materials. In other cases, based on the combined electron donor-acceptor characteristics, long-lived light-induced charge-separated states within the molecules can easily be populated and we reached life-times for them of the order of a few microseconds; a result which is outstanding in view of the molecular architecture which is based on a mononuclear coordination compound, only. To sum up, a 'new' technique, namely to fuse/annulate electron donors and acceptors in rigid, extended pi-electron conjugated molecular systems with defined geometries and symmetries has successfully been applied - their characteristics will extensively be probed for the field of molecular electronics.
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References in databases
(English)
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Swiss Database: COST-DB of the State Secretariat for Education and Research Hallwylstrasse 4 CH-3003 Berne, Switzerland Tel. +41 31 322 74 82 Swiss Project-Number: C05.0064
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