Copper(II) and zinc(II) complexes with 2-formylpyridine-derived hydrazones

• Published in: Polyhedron Vol. 28; no. 17; pp. 3797 - 3803
• Main Authors: Despaigne, Angel A. Recio, Silva, Jeferson G. da, Carmo, Ana Cerúlia M. do, Sives, Flavio, Piro, Oscar E., Castellano, Eduardo E., Beraldo, Heloisa
• Format: Journal Article
• Language: English
• Published: OXFORD Elsevier Ltd 16.11.2009; Elsevier
• Subjects: Chemistry; Chemistry, Inorganic & Nuclear; Crystal structure; Crystallography; Hydrazones; Metal complexes; Physical Sciences; Science & Technology; Hydrazones; Metal complexes; Crystal structure; TIN(IV) COMPLEXES; COORDINATION; SPECTRAL CHARACTERIZATION; 2-BENZOYLPYRIDINE-DERIVED THIOSEMICARBAZONES; DIMERS; DERIVATIVES; MAGNETIC-INTERACTIONS
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2009.07.059

2-Formylpyridine- para-chloro-phenyl hydrazone (H2FopClPh) and 2-formylpyridine- para-nitro-phenyl hydrazone (H2FopNO 2Ph) were obtained, as well as their copper(II) and zinc(II) complexes [Cu(H2FopClPh)Cl 2] ( 1), [Cu(2FopNO 2Ph)Cl] ( 2), [Zn(H2FopClPh)Cl 2] ( 3) and [Zn(H2FopNO 2Ph)Cl 2] ( 4). Upon re-crystallization in DMSO:acetone conversion of 2 into [Cu(2FopNO 2Ph)Cl(DMSO)] ( 2a) and of 4 into [Zn(2FopNO 2Ph)Cl(DMSO)] ( 4a) occurred. The crystal structures of 1, 2a, 3 and 4a were determined. The electron-withdrawing effect of the para-nitro group probably makes the metal center more positive and hence more able to accept the fifth ligand. In the case of 4a this effect favors deprotonation at N3, with release of HCl, and attachment of a DMSO molecule to the metal. In the present work 2-formylpyridine- para-chloro-phenyl hydrazone (H2FopClPh) and 2-formylpyridine- para-nitro-phenyl hydrazone (H2FopNO 2Ph) were obtained, as well as their copper(II) and zinc(II) complexes [Cu(H2FopClPh)Cl 2] ( 1), [Cu(2FopNO 2Ph)Cl] ( 2), [Zn(H2FopClPh)Cl 2] ( 3) and [Zn(H2FopNO 2Ph)Cl 2] ( 4). Upon re-crystallization in DMSO:acetone conversion of 2 into [Cu(2FopNO 2Ph)Cl(DMSO)] ( 2a) and of 4 into [Zn(2FopNO 2Ph)Cl(DMSO)] ( 4a) occurred. The crystal structures of 1, 2a, 3 and 4a were determined.