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Abstract
[Mn(L)(μ1,1–N3)2]2 n [Mn(H2O)2(μ1,1–N3)2] n (1) and [Cd(HL)(μ1,1–N3)2] n (2) have been synthesized from HL (HL: pyridine-2-carbaldehyde semicarbazone) and azide ligands, characterized by FT-IR, UV–vis spectroscopy and X-ray crystallography. Single crystal X-ray diffraction revealed that 1 is a coordination polymer consisting of two infinite 1-D chains: chain A with [Mn(L)(μ1,1–N3)2]2 n and chain B with [Mn(H2O)2(μ1,1–N3)2] n . In both chains, Mn centers are connected via two double end-on (EO) azide bridges. 2 is a coordination polymer consisting of a 1-D infinite chain, where Cd centers are connected via two double EO azide bridges. The electrochemistry of HL, 1 and 2 were studied by cyclic voltammetry. Magnetic susceptibility measurements indicate bulk ferromagnetic coupling for 1 below 5 K. Antimicrobial activities of both compounds 1 and 2 were greater than HL, with the strongest effect for 2 consistent with its larger radius and electronegativity of Cd(II) ions.
Acknowledgements
We gratefully acknowledge the financial support of the Tabriz University Research council and are also very much obliged to Dr. Babak Mirtamizdoust and Mr. Majid Sadeghi for their assistance. We also acknowledge support of the project Praemium Academiae of the Academy of Sciences of the Czech Republic. As well, this work is supported by Slovak Grant Agency VEGA-1/0159/09 and by the ERDF EU (European Union European regional development fund) grant under contract No. ITMS26220120005.
