title: Intramolecular charge-transfer interactions in pi-extended tetrathiafulvalene derivatives.
abstract: New electron-donor (D)-electron-acceptor (A) TTF architectures are presented in which two electron-donating 1,3-dithiole moieties are connected by a pi bridge to the weak electron-accepting quinoxaline moiety (D-pi-A compounds 9a and 9b and also two 1,3-dithiole-2-ylidene moieties are connected by a pi bridge to the electron-accepting thieno[3,4-b]quinoxaline bridge (D-pi-A-pi-D compounds 12a-c). There are through-bond intramolecular charge-transfer (ICT) interactions, predicted in theoretical calculations, and confirmed by UV-vis spectroscopy and cyclic voltammetry measurements. This work constitutes the first use of quinoxalines as electron-accepting moieties in D-pi-A compounds.
authors.affiliation: Department of Chemistry, The University of Alabama, Box 870336, Tuscaloosa, AL 35487-0336, USA.
authors.forename: Emad
authors.initials: E
authors.lastname: Aqad
authors.forename: M V
authors.initials: MV
authors.lastname: Lakshmikantham
authors.forename: Michael P
authors.initials: MP
authors.lastname: Cava
authors.forename: Robert M
authors.initials: RM
authors.lastname: Metzger
authors.forename: Vladimir
authors.initials: V
authors.lastname: Khodorkhovsky