Vilma Bojan, R. and Czerwieniec, Rafal and Laguna, Antonio and Lasanta, Tania and Lopez-de-Luzuriaga, Jose M. and Monge, Miguel and Elena Olmos, M. and Yersin, Harmut (2013) Luminescent gold-silver complexes derived from neutral bis(perfluoroaryl)diphosphine gold(I) precursors. DALTON TRANSACTIONS, 42 (12). pp. 4267-4277. ISSN 1477-9226, 1477-9234
Full text not available from this repository. (Request a copy)Abstract
Complex [Au{4-C6F4(4-C6BrF4)}(tht)] reacts with diphosphines (L-L) such as bis(diphenylphosphino)methane (dppm) or 1,2-bis(diphenylphosphino) benzene (dppb) in a 2 : 1 molar ratio in dichloromethane, leading to neutral products of stoichiometry [(Au{4-C6F4(4-C6BrF4)})(2)(mu-L-L)] (L-L = dppm (1), dppb (2)). In the crystal structure of complex 2 short Au center dot center dot center dot Au interactions of 2.9367(5) and 2.9521(5) angstrom appear. This complex displays an orange emission, which is assigned to arise from a charge transfer transition from a metal centered Au-Au orbital to an orbital located at the diphosphine ligand. Addition of silver trifluoroacetate to these complexes in a 1 : 1 or a 2 : 1 molar ratio generates polymeric heterometallic gold-silver compounds of stoichiometry [Ag2Au2{4-C6F4(4-C6BrF4)}(2)(CF3CO2)(2)(mu-L-L)](n) (L-L = dppm (3), dppb (4)), which confirms the capability of the neutral [(Au{4-C6F4(4-C6BrF4)})(2)(mu-diphosphine)] units to act as electron density donors when treated with a Lewis acid substrate. These heterometallic derivatives show blue emissions indicating large HOMO-LUMO band gaps, due to the stabilization that the gold-based HOMO orbitals suffer when the electron withdrawing silver trifluoroacetate fragments interact with them.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | THEORETICAL CHEMISTRY; PHOTOPHYSICAL PROPERTIES; VAPOCHROMIC BEHAVIOR; EXCITED-STATE; THALLIUM; DIPHOSPHINE; ELEMENTS; LIGANDS; DENSITY; SYSTEMS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Hartmut Yersin |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Apr 2020 07:04 |
| Last Modified: | 29 Apr 2020 07:04 |
| URI: | https://pred.uni-regensburg.de/id/eprint/17464 |
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