Two- and three-dimensional CuSCN co-ordination networks including new CuSCN structural motifs

摘要

The reaction of CuSCN with linear bridging N-donor ligands afforded two- and three-dimensional networks depending on the ligand used. Reaction of two equivalents of CuSCN with one equivalent of pyrazine in ethanol and aqueous ammonia afforded the three-dimensional network [Cu_2(SCN)_2(pyz)]_(infinity). Replacing pyrazine with 4,4'-bipyridyl under the same conditions gave a different three-dimensional network [Cu_2(SCN)_2(4,4'-bipy)]_(infinity). In contrast two-dimensional sheets of [Cu_2(SCN)_2(bpe)]_(infinity) (bpe = 1, 2-trans-(4-pyridyl)ethene) were isolated from the reaction of CuSCN with bpe in a 2 : 1 ratio. The structures of both [Cu_2(SCN)_2(pyz)]_(infinity) and [Cu_2(SCN)_2(4,4'-bipy)]_(infinity) are constructed from (CuSCN)_(infinity) layers linked in a herringbone fashion by the bridging N-donor ligands to afford three-dimensional networks. The complex [Cu_2(SCN)_2(bpe)]_(infinity), however, shows two-dimensional sheets which are formed from (CuSCN)_(infinity) stair-polymers bridged by bpe ligands.