A new π donor-acceptor compound derived from tetraphenyldithiapyranylidene and bis-(1,3-dithia-2- thione-4,5-dithiolato)-nickelate: crystal structure and epr study
作者:H. Strzelecka、R. Vicente、J. Ribas、J.-P. Legros、P. Cassoux、P. Petit、J.-J. Andre
DOI:10.1016/s0277-5387(00)83755-9
日期:1991.1
The electrosynthesis, X-ray crystal structure and EPR study of the 1:1 adduct between tetraphenyldithiapyranylidene and bis-(1,3-dithia-2-thione-4,5-dithiolato)-nickelate, (DIPS-PHI-4)[Ni(dmit)2], are reported. The triclinic unit cell contains one Ni(dmit)2 and one DIPS-PHI-4 entity, the molecular centre of each lying on a crystallographic centre of symmetry. The structure is characterized by a loose stacking ( > 10 angstrom) of Ni(dmit)2 units along [001], with no strong intermolecular interaction, consistent with the low electrical conductivity. Single-crystal EPR spectra show a single, broad line for any orientation. The angular dependences of the line width and of the g-factors have been determined, as well as the principal g-values and directions. The temperature-dependences of the susceptibility, the line width and the g-factor have been measured in the range 4-300 K. Analysis of these results indicates that dipolar spin-spin interaction takes place in this highly electron-correlated semiconducting system with complete charge transfer between the donor DIPS-PHI-4 and the acceptor Ni(dmit)2.