Infrared and electronic spectra of isothiocyanato- and thiocyanatopolyamine copper(II) complexes

I.r. and visible spectra of the square planar [Cu en2](CNS)2, trigonal bipyramidal [Cu tren(NCS)](CNS), and square pyramidal [Cu trien(SCN)](CNS), both in solid state and in methanolic solution, are measured and discussed. A structure for the [Cu tpt(NCS)](CNS) complex is suggested (en = ethylenediamine, tren = 2,2′,2″-triaminotriethylamine, trien = triethylenetetramine, tpt = 3,3′,3″-triaminotripropylamine).