Delocalization in platinum-alkynyl systems: a metal-bridged organic mixed-valence compound |
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Authors: | Jones Simon C Coropceanu Veaceslav Barlow Stephen Kinnibrugh Tiffany Timofeeva Tatiana Brédas Jean-Luc Marder Seth R |
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Affiliation: | School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, USA. |
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Abstract: | A complex featuring two triarylamine redox centers bridged by Pt, trans-bis(triethylphosphine)-bis{4-[bis(4-methoxyphenyl)amino]phenylethynyl} platinum(II), has been synthesized as a model system for pi-conjugated Pt-containing polymers. Analysis of the intervalence charge-transfer band displayed by its mixed-valence monocation affords a quantitative assessment of electronic delocalization through the Pt bridge; this is found to be only slightly smaller than that determined for a benzene-bridged analogue. These results are supported by density functional theory calculations, which show that the active orbitals involved in the electron-transfer process in both cases have similar delocalization through the bridging unit. |
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