Abstract
The reaction between Cu 2+ and SCN −, in glacial acetic acid at a Cu/SCN ratio, of 1:4, gave a dark red solution that exhibited an absorption band at 496 nm. The colour of the freshly prepared solution was bleached by water with concomitant production of SO 4 2− ion. On standing, the stability of the colour towards water is increased and the position of the absorption band shifts to a higher wavelength. It is inferred that the thiocyanogen produced on oxidation of SCN − by Cu 2+ is stable in the non-aqueous medium and is coordinated together with SCN − in a Cu(I) complex. The bleaching action of water is attributed to the hydrolysis of thiocyanogen, mainly to SO 4 2−. The presence of thiocyanogen enhanced polymerization and subsequent deposition of an orange-brown solid complex. On the basis of chemical, spectral, and thermal analyses the formula K[Cu(SCN) 2(NCS—SCN)], is assigned to the new compound.
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