title: Two Zn(II) mononuclear coordination compounds with pyridinedicarboxylate and auxiliary N-(pyridin-4-ylmethylidene)hydroxylamine ligands.
abstract: Two new mononuclear coordination compounds, bis{4-[(hydroxyimino)methyl]pyridinium} diaquabis(pyridine-2,5-dicarboxylato-κ(2)N,O(2))zincate(II), (C6H7N2O)2[Zn(C7H3NO4)2(H2O)2], (1), and (pyridine-2,6-dicarboxylato-κ(3)O(2),N,O(6))bis[N-(pyridin-4-ylmethylidene-κN)hydroxylamine]zinc(II), [Zn(C7H3NO4)(C6H6N2O)2], (2), have been synthesized and characterized by single-crystal X-ray diffractometry. The centrosymmetric Zn(II) cation in (1) is octahedrally coordinated by two chelating pyridine-2,5-dicarboxylate ligands and by two water molecules in a distorted octahedral geometry. In (2), the Zn(II) cation is coordinated by a tridentate pyridine-2,6-dicarboxylate dianion and by two N-(pyridin-4-ylmethylidene)hydroxylamine molecules in a distorted C2-symmetric trigonal bipyramidal coordination geometry.
authors.affiliation: Institute of Chemistry, Academy of Sciences of Moldova, Academiei Street 3, MD2028 Chisinau, Republic of Moldova.
authors.forename: Eduard B
authors.initials: EB
authors.lastname: Coropceanu
authors.affiliation: Tiraspol State University, Iablocikin Street 5, Chisinau, Republic of Moldova.
authors.forename: Ana
authors.initials: A
authors.lastname: Dreab
authors.affiliation: Institute of Applied Physics, Academy of Sciences of Moldova, Academiei Street 5, MD2028 Chisinau, Republic of Moldova.
authors.forename: Lilia
authors.initials: L
authors.lastname: Croitor
keywords: N-(pyridin-4-ylmethylidene)hydroxylamine; crystal structure; pyridine-2,5-dicarboxylic acid; pyridine-2,6-dicarboxylic acid; zinc(II) complexes