ISSN:
1572-8951
Keywords:
TTF
;
molecular complexes
;
degree of charge transfer
;
nitro-carboxylated fluorene derivatives
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The charge transfer complex (CTC)tetrathiafulvalene-9-dicyanomethylene-2,4,5,7-tetranitrofluorene(DT4NF) displays a degree of charge transfer Z = 0.7.This value is situated close to the border between intermediateand strong CTC's. Under the view, that CTC's with values 0.4 〈Z 〈 0.7 in general are molecular electrical conductors, fourdifferent CTC's were prepared formed of tetrathiafulvalene andacceptors which were derived from9-dicyanomethylene-2,4,5,7-tetranitrofluorene (DT4NF) withsubstituents of less electronegative capacity. The degree of chargetransfer was determined by use of IR- and Raman spectroscopy.It was found, that its value decreased in all the studied cases. Inparticular, for the complex with the acceptor 9-dicyanomethylene-4,5,7-trinitrofluorene-2-carboxylic acid(DC2TNF), Z was found within the limits representative ofmolecular electrical conductors. This result is explained by thefact, that the nitro substituent of the 2-position fluorene skeletonwas exchanged by a group of similar volume (carboxyl), but withless electron-withdrawing effect.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1008384013189
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