Isolated linear CuCN chains in a 2,3-dihydroxyquinoxaline host lattice

CuCN 2,3-dihydroxyquinoxaline (1) can be crystallised by slowly cooling an acetonitrile solution of the components from 100 to 20 degreesC. 1 contains two polymeric isolated (1)(infinity)[CuCN] chains within the open channels provided by hydrogen bonded stacks of 2,3-dihydroxyquinoxaline molecules. Positional disorder is observed for the C/N atoms of the bridging cyanide l igands within the effectively linear. (1)(infinity)[CuCN] chains, which exh ibit angles of 169.9(2)degrees at Cu and 171.8(6)degrees /178.1(6)degrees a t the C/N atoms. Only very weak O...Cu interactions of 2.728(5) and 2.697(5 ) A are observed between the: CuCN chains and the 2,3-dihydroxyquinoxaline stacks.