Synthesis, characterization and crystal structures of Ni(II), Cd(II) complexes with N -(2-propionic acid)-salicyloyl hydrazone and bipy/phen

• Published in: Journal of coordination chemistry Vol. 61; no. 17; pp. 2703 - 2714
• Main Authors: Wu, Wang-Ting, He, Shui-Yang, Liu, Feng, Chen, Feng-Ying, Wang, Yao-Yu, Shi, Qi-Zhen
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 10.09.2008
• Subjects: Bipy; Crystal structure; H-bonding; N-(2-propionic acid)-salicyloyl hydrazone; Phen; Transition metal complexes; π-π interaction
• ISSN: 0095-8972; 1029-0389
• DOI: 10.1080/00958970801958519

The ligand N-(2-propionic acid)-salicyloyl hydrazone(H 3 L, 1) and its new transition metal(II) complexes [NiHL(bipy)H 2 O] (2), [CdHL(bipy)(H 2 O) 2 ] 2 ·2H 2 O (3) and [NiHL(phen)H 2 O]·H 2 O (4) (HL is a dianion, bipy = 2,2′-bipyridine and phen = 1,10-phenanthroline) were synthesized and characterized on the basis of elemental analyses, IR, 1 H NMR, molar conductivity and thermal analysis. Single crystal X-ray diffraction showed that 1 is in keto form and connected by hydrogen bonds to form a two-dimensional supermolecular compound. Complexes 2 and 4 have the same structure with distorted meridional octahedral geometry with 1 as a tridentate ligand with keto-form coordination by azomethine, carboxyl O and acyl O. In 3, ligand 1 bridges two Cd(II) atoms by μ 2 -O of carboxyl. H-bonding is an important weak interaction for constructing supermolecular frameworks. There are π-π interactions between bipy or phen rings in 3 or 4, respectively.