Crystal Spectra of Metal Coordination Compounds. VI. Bis-Salicylaldiminato-Copper (II) and Bis-N-Methyl-Salicylaldiminato-Copper (II)

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Abstract
The polarized crystal absorption spectra of bis‐N‐methylsalicylaldiminato‐copper (II) and bis‐salicylaldiminato‐copper (II) are reported. In each case measurements have been made with two different crystal faces. An analysis of the spectra shows that the ligand field is rhombic (D2h) and the in‐plane symmetry axes do not lie along metal‐ligand bonds but between them, as reported previously for the corresponding nickel compounds. The effect of copper‐copper interaction in the crystal is briefly discussed.