The crystal structure of di(5-amino-3-thione-1,2,4-dithiazole)tris-thiocyanatobismuthate(III), (C2H2N2S3)2Bi(SCN)3

Single crystals of (CThe other four sites of the coordination polyhedron are occupied by S and N atoms of thiocyanate ions. Two of them form bonds via S to the Bi atom. A third thiocyanate group acts as a bidentate ligand, connecting neighbouring Bi atoms. These ambidently bridging thiocyanate ions are disordered, thus leading to infinite chains made up of equal numbers of – Bi – S – C – N – Bi′ – and – Bi – N – C – S – Bi′ – units, running nearly parallel to the crystallographic

Synthesis and vibrational spectra of lead(II) thiocyanate complexes

The preparation, properties, and vibrational spectra are reported for the following complexes of lead(II) thiocyanate with mono- and bidentate ligands: Pb(NCS)2•2py, Pb(NCS)2•phen, Pb(NCS)2•2phen, Pb(NCS)2•tmen, Pb(NCS)2•en, Pb(NCS)2•2en, Pb(NCS)2•2dmso, and Pb(NCS)2•2dma. Assignments are made for the ν(CN), ν(CS), and δ(NCS) vibrational bands of the thiocyanate group and the results are discussed in terms of the type of coordination of NCS with lead(II). Values are consistent with bridge-bonded and/or N-bonded thiocyanate. Infrared and Raman spectra of the complexes Pb(NCS)2•bipy and Pb(NCS)2•4tu are reexamined and new assignments are made which support bridge-bonded and/or N-bonded NCS contrary to previous reports of S-bonded NCS.