Structural and spectroscopic properties of Hexamethylenetetramine cobalt(II) complex: [Co(NCS) 2(hmt) 2(H 2O) 2][Co(NCS) 2(H 2O) 4] (H 2O)

Abstract

Synthesis, structure, spectroscopy and thermal properties of complex [Co(NCS) 2(hmt) 2(H 2O) 2][Co(NCS) 2(H 2O) 4] (H 2O) ( I), assembled by hexamethylenetetramine and octahedral Co(II) metal ions, are reported. Crystal data for I: F w 387.34, a=9.020(8), b=12.887(9), c=7.95(1) Å, α=96.73(4), β=115.36(5), γ=94.16(4)°, V=820(1) Å 3, Z=2, space group= P−1, T=173 K, λ(Mo-K α)=0.71070 Å, ρ calc=1.718567 g cm −3, μ=17.44 cm −1, R=0.088, R w=0.148. An interesting two-dimensional network is assembled via hydrogen bonds through coordinated and free water molecules. The d–d transition energy levels of Co(II) ion are determined by UV–vis spectroscopy and calculated by ligand field theory. The calculated results agree well with experiment ones.