ON THE THERMOCHROMISM OF A Cu-(N)4-TYPE COPPER(II) CHELATE, BIS(1,5-DIAZA CYCLOOCTANE)COPPER(II) NITRATE

The title complex, [Cu(daco)2](NO3)2, was newly obtained, and found to show a characteristic reversible thermochromism. Its color changes from orange to violet on heating at 90°C, and becomes orange again on cooling. The mechanism of this thermochromism is suggested on the basis of the UV-visible reflectance spectra, and IR and TG-DTA data.