The crystal and molecular structure of bis(piperidinyl-dithiocarbamato)selenium(II)

Abstract

Selenium(IV) undergoes reductive complexation with dithiocarbamate ([unk] > N – CS2− = L−) to give SeL2. The complexes prepared are with R1 = R2 = n-propyl, isopropyl and R1R2N = piperidinyl. The crystal structure of bis(piperidinyl-dithiocarbamato)selenium(II) is reported. The crystals are monoclinic, space group P21/n with cell parameters a = 8.735(1), b = 11.530(2), c = 16.766(3) Å, β = 100.58(1)°, F(000) = 816. Final R = 0.088 for 2879 unique reflections. The SeS4 core has a planar trapezoidal configuration. The dithiocarbamate ligands are present as unequal bidentates with one short Se – S [2.301(3) Å] and long Se – S [2.785(3) Å] bonds. The average Se – S bond distance 2.547(4) Å is close to the average Se – S distance observed in four coordinated Se(II) – sulphur ligand complexes.