Copper(II) and zinc(II) complexes with Schiff-base ligands derived from salicylaldehyde and 3-methoxysalicylaldehyde: Synthesis,crystal structures,magnetic and luminescence properties |
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| Authors: | Catalin Maxim Traian D Pasatoiu Victor Ch Kravtsov Sergiu Shova Christopher A Muryn Richard EP Winpenny Floriana Tuna Marius Andruh |
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| Institution: | 1. Inorganic Chemistry Laboratory, Faculty of Chemistry, University of Bucharest, Str. Dumbrava Rosie nr. 23, 020464-Bucharest, Romania;2. School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK;3. X-ray Laboratory, Institute of Applied Physics, Academy of Sciences of Moldova, Str. Academiei nr. 5, 2028 Chisinau, Republic of Moldova;4. Department of Chemistry Moldova State University, A. Mateevici Str. 60, 2009 Chisinau, Republic of Moldova |
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| Abstract: | The following Schiff bases were employed as ligands in synthesizing copper(II) and zinc(II) complexes: N-(2-pyridyl)-methyl]-salicylimine (Hsalampy), N-2-(N,N-dimethyl-amino)-ethyl]-salicylimine (Hsaldmen), and N-(2-pyridyl)-methyl]-3-methoxy-salicylimine (Hvalampy). The first two ligands were obtained by reacting salicylaldehyde with 2-aminomethyl-pyridyne and N,N-dimethylethylene diamine, respectively, while the third one results from the condensation of 3-methoxysalicylaldehyde with 2-aminomethyl-pyridine. Four new coordination compounds were synthesized and structurally characterized: Cu(salampy)(H2O)(ClO4)] 1, Cu2(salampy)2(H2trim)2] 2 (H2trim? = the monoanion of the trimescic acid), Cu4(valampy)4](ClO4)4 · 2CH3CN 3, and Zn3(saldmen)3(OH)](ClO4)2 · 0.25H2O 4. The crystal structure of 1 consists of supramolecular dimers resulted from hydrogen bond interactions established between mononuclear Cu(salampy)(H2O)(ClO4)] complexes. Compound 2 is a binuclear complex with the copper ions connected by two monoatomic carboxylato bridges arising from two molecules of monodeprotonated trimesic acid. The crystal structure of 3 consists of tetranuclear cations with a heterocubane {Cu4O4} core, and perchlorate ions. Compound 4 is a trinuclear complex with a defective heterocubane structure. The magnetic properties of complexes 1–3 have been investigated. Compound 4 exhibits solid-state photoluminescence at room temperature. |
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