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Issue 21, 2013
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Two pairs of 1<img border='0' src='http://www.rsc.org/images/entities/h2_char_2009.gif' alt=' '/>:<img border='0' src='http://www.rsc.org/images/entities/h2_char_2009.gif' alt=' '/>2 nickel(II) and copper(II) metal-complex dyes showing the same trans configuration and azohydrazone transformation but different thermal properties

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Abstract

Two pairs of 1 : 2 neutral trans mononuclear transition-metal (M = NiII and CuII) complexes of pyridine-2,4-dione and quinoline-2,4-dione based heterocyclic dyes have been structurally and spectrally characterized and compared herein. X-ray single-crystal diffraction analyses of four complexes, namely trans-[Ni(La)2(DMF)2] (1), trans-[Cu(La)2(DMF)2] (2), trans-[Ni(Lb)2(DMF)2] (3) and trans-[Cu(Lb)2(DMF)2] (4), reveal that they have the same trans configuration between the bidentate chelating dianionic ligands and two axially coordinated DMF molecules. Furthermore, a transformation from the hydrazone to azo configuration has been observed for both bidentate chelating ligands La and Lb after metal-ion complexation. More importantly, the simultaneous DSC/TG-MS-FTIR method has been used to explore the thermal stability of four neutral metal-complex dyes 1–4, where the two axially coordinated DMF molecules in NiII and CuII complexes exhibit distinguishable decomposition behavior because of their different M–O bond lengths originating from the Jahn–Teller distortions.

Graphical abstract: Two pairs of 1<img border='0' src='http://www.rsc.org/images/entities/char_2009.gif' alt=' '/>:<img border='0' src='http://www.rsc.org/images/entities/char_2009.gif' alt=' '/>2 nickel(ii) and copper(ii) metal-complex dyes showing the same trans configuration and azo–hydrazone transformation but different thermal properties

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Publication details

The article was received on 23 Jan 2013, accepted on 07 Mar 2013 and first published on 08 Mar 2013


Article type: Paper
DOI: 10.1039/C3DT50229E
Citation: Dalton Trans., 2013,42, 7679-7692
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    Two pairs of 1<img border='0' src='http://www.rsc.org/images/entities/h2_char_2009.gif' alt=' '/>:<img border='0' src='http://www.rsc.org/images/entities/h2_char_2009.gif' alt=' '/>2 nickel(II) and copper(II) metal-complex dyes showing the same trans configuration and azohydrazone transformation but different thermal properties

    X. Chen, Y. Wang, T. Tao, J. Geng, W. Huang and H. Qian, Dalton Trans., 2013, 42, 7679
    DOI: 10.1039/C3DT50229E

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