Comments on visible spectra of Cu and Ni chelates of tetradentate Schiff's bases

Abstract
Spectra of some Cu and Ni chelates of Schiff's bases are discussed. We conclude that interpretation of the band polarizations of the centric chelates must await a detailed vibronic calculation. Evidence is cited to show that the prominent green band of Cu chelates of Schiff's bases is the (x 2-y 2) « (xy) transition. Pure electronic selection rules of acentric Cu chelates are discussed and used.

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