THE NATURE OF THE ELECTRONIC-TRANSITIONS IN SOME METAL DITHIOLENES AS REVEALED BY RESONANCE RAMAN-SPECTROSCOPY AND TRANSFORM METHODS

The nature of the electronic transitions present in the optical spectra of the 4,5-dimercapto-1,3-dithiole-2-thione (H2dmit) complexes [Ni(dmit)2]2- and [Zn(dmit)2]2- was investigated by resonance Raman spectroscopy, supported by the transform method. The previous assignment proposed for the 515 nm band in [Zn(dmit)2]2- is shown to be incorrect, and the intrinsically different nature of the charge-transfer transitions in [Zn(dmit)2]2- and [Ni(dmit)2]2- is revealed by the excitation profiles and by the parameters obtained from the use of the transform method.