Z. Dai, L. Qun, B. Peng
Sep 1, 1997
Citations
0
Influential Citations
4
Citations
Journal
Dyes and Pigments
Abstract
Abstract A new unsymmetric substituted bis(dithiobenzil)nickel complex containing two phenyl groups and two substituted phenyl groups was synthesized from a benzoin compound using phosphorus pentasulfide chloride. The benzoin compounds were prepared from phenylglyoxyal and substituted benzenes. The nickel complexes were characterized by elemental analysis, MS, 1 HNMR and IR. The influence of substitutuents on the long wavelength absorption maxima of the nickel complexes was evaluated using the Hammett equation; they gave a pronounced effect relative to the corresponding symmetric nickel complexes, some of them having maximum absorption around 830 nm, and are thus very promising for use as near-infrared absorbing dyes for optical data storage using a Ga-As semiconductor laser diode.