Issue 11, 2016

Copper(ii) hydrazone complexes with different nuclearities and geometries: synthetic methods and ligand substituent effects

Abstract

A series of copper(II) complexes with 4-hydroxybenzhydrazone-related ligands was synthesized by using various methods, including the conventional solution-based method, solvothermal route and electrochemical synthesis. The complexes can be classified as mononuclear [Cu(L3OMe)(py)] (2py), dinuclear [Cu2(LH)2(py)2] (1py), [Cu2(LH)2] ( and ), [Cu2(LH)2(py)2] (1py), [Cu2(L4OMe)2(py)2] (3py), [Cu2(L4OMe)2] (3), [Cu2(L4OMe)2(MeOH)2] (3MeOH), [Cu2(L4OMe)2(EtOH)2] (3EtOH), cubane tetranuclear [Cu4(L3OMe)4xsolv (xsolv = 10H2O·CH3OH and 2.8EtOH·0.2H2O for 2MeOH and 2EtOH, respectively), or polynuclear [Cu(LH)(py)]n (1py*), where LH = 2-oxybenzaldehyde 4-hydroxybenzhydrazonato, L3OMe = 3-methoxy-2-oxybenzaldehyde 4-hydroxybenzhydrazonato, and L4OMe = 4-methoxy-2-oxybenzaldehyde 4-hydroxybenzhydrazonato ligands. The presented study indicates that complexes having different nuclearities and geometries can be achieved by changing the synthetic conditions and methods. Thermally induced structural transformations of the dinuclear complexes under solvent-free conditions were also investigated. Crystal and molecular structures of , 1py*, 2MeOH, 2EtOH, 2py, 3 and 3MeOH were determined using the single crystal X-ray diffraction method. All complexes were characterized using microanalysis, FT-IR and CW-EPR spectroscopy, thermogravimetric analysis and a powder X-ray diffraction method.

Graphical abstract: Copper(ii) hydrazone complexes with different nuclearities and geometries: synthetic methods and ligand substituent effects

Supplementary files

Article information

Article type
Paper
Submitted
04 Apr 2016
Accepted
19 Sep 2016
First published
20 Sep 2016

New J. Chem., 2016,40, 9263-9274

Copper(II) hydrazone complexes with different nuclearities and geometries: synthetic methods and ligand substituent effects

V. Vrdoljak, G. Pavlović, N. Maltar-Strmečki and M. Cindrić, New J. Chem., 2016, 40, 9263 DOI: 10.1039/C6NJ01036A

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