Crystal structures, spectro-structural correlation and structural pathways of eight [Cu(dpyam)2(NCO)][Y] complexes (dpyam = di-2-pyridylamine), Y = Br−, CF3SO3-, BF4-·dpyam, Cl− · 4H2O, NO3-, PF6-, ClO4- and BPh4-

The crystal structures and structural pathway in a series of five-coordinated complexes [Cu(dpyam)2(NCO)][Y] complexes when Y = Br− (1), CF3SO3-(2), BF4-·dpyam(3), Cl− · 4H2O (4), NO3-(5), PF6-(6), ClO4-(7) and BPh4-(8), respectively have been studied.The distorted structures of these complexes vary from trigonal bipyramidal distorted square based pyramidal (TBDSBP) geometry to square base pyramidal distorted trigonal bipyramidal (SBPDTB) geometry with τ values of 0.09-0.76, respectively.