Five-co-ordination in cobalt(II) complexes. Crystal structure of di-isothiocyanato-[NN-bis-(2-diethylaminoethyl)-2-methylthioethylamine-NNN]cobalt(II)

Abstract

The crystal and molecular structure of Co(NCS)₂(N₃S),½BuOH [N₃S =NN-bis-(2-diethylaminoethyl)-2-methylthioethylamine] has been determined by single-crystal X-ray techniques, using photographic data, and has been refined to R 0·069. The crystals are monoclinic, space group P2₁/c, with a= 7·615 ± 0·002, b= 13·927 ± 0·004, c= 25·442 ± 0·010 Å, β= 97° 59′± 3′, and Z= 4. The metal atom is surrounded by five nitrogen atoms at the apices of a distorted trigonal bipyramid. The two Co–N distances involving NCS nitrogen atoms are comparable [average 1·978 (11)Å]. The other three Co–N (tertiary nitrogen) distances are 2·158(10), 2·149(10), and 2·244(9)Å, the longest of these involving the central nitrogen atom of the ligand N₃S, which occupies one apex of the bipyramid. The sulphur atom of the ligand is not bonded to the metal (Co ⋯ S 5·83 Å).