Abstract
The polarized single-crystal reflection spectra of Magnus' green salt and two of its tetra-alkylamine analogs have been determined and the corresponding absorption spectra obtained through Kramers—Krönig analyses. It is found that a strong ultraviolet transition exists with the proper polarization for the visible out-of-plane bands to gain their intensity from it through vibronic mixing of zero-order electronic wavefunctions. The correlation of the visible intensity with the nature of the ultraviolet band further confirms this mechanism. Possible assignments of the ultraviolet band are discussed.
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