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Geometric Influence on Intramolecular Photoinduced Electron Transfer in Platinum(II) Acetylide‐Linked Donor–Acceptor Assemblies
Author(s) -
MolinaOntoria Agustín,
RiveraNazario Danisha M.,
Tigreros Alexis,
Ortiz Alejandro,
Nuñez José E.,
Insuasty Braulio,
Lueders Daniela,
Wolfrum Silke,
Guldi Dirk M.,
Echegoyen Luis
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201402616
Subject(s) - intramolecular force , acetylide , platinum , photochemistry , electron transfer , acceptor , chemistry , materials science , stereochemistry , catalysis , physics , organic chemistry , condensed matter physics
Abstract A new donor–acceptor system, in which the electron donor triphenylamine (TPA) and the electron acceptor C 60 are bridged through a cis‐ or trans‐ platinum(II) acetylide spacer have been prepared. Ground‐state studies were conducted using electrochemistry and UV/Vis spectroscopy. Fluorescence studies suggested that charge transfer is the deactivation mechanism for the singlet excited state, and this was verified by transient absorption spectroscopy. Selective photoexcitation of 1 and 2 at 387 nm leads to a fast charge transfer between the TPA and C 60 , which gives rise to a radical ion‐pair state (TPA .+ –Pt–C 60 .− ). Our results suggest that charge transfer is favored for the cis configuration while the presence of the trans configuration in the Pt II diacetylide results in a longer‐lived charge separated states.