Dicyanonitrosomethanide as a subject of nucleophilic addition of methanol and as an end-O-coordinated ligand in the same copper(II) complex.: II.: (Bipyridine)(dicyanonitrosomethanido)[methyl(2-cyano-2-hydroxyimino)ethanimidato]copper(II)

A new ligand formation was observed in the title complex, (bipyridine-N,N') (dicyanonitrosomethanido-O)(3-imino-3-methoxy-2-nitrosoacrylonitrilato-N-2,N-3)-copper(II), [CU(C4H4N3O2)(C3N3O)(C10H8N2)], as a result of the nucleophilic addition reaction between a dicyanonitrosomethanide anion (ndcm), [ONC(CN)(2)](-), and a methanol molecule, CH3OH, in the inner coordination sphere of the Cu-II atom. This new ligand, the methyl (2-cyano-2-hydroxyimino)ethanimidate anion (mcoe), [ONC(CN)C(NH)OCH3](-), is coordinated as a chelate, forming a five-membered metallocycle with the Cu-II atom. Thus, the distorted tetragonal-pyramidal coordination of the Cu-II atom is formed by one chelate-coordinated molecule of 2,2'-bipyridine (bipy), one chelate-coordinated mcoe ligand and one end-O-coordinated ndcm, Four N atoms of the two metallocycles form the base and a fifth atom, an O atom of the ndcm anion, forms the apex of the tetragonal pyramid, creating a (CuN4O) chromophore, The structure of [Cu(bipy)(mcoe)(ndcm)] consists of discrete molecules and is the first example of a compound in which one ndcm anion is the subject of a nucleophilic addition reaction and another is an end-O-coordinated ligand.