Add time:08/31/2019 Source:sciencedirect.com
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, 1HNMR 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.
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