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Issue 3, 2012
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Fine tuning of pentachromium(II) metal string complexes through elaborate design of ligand

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Abstract

New pentachromoium metal string complexes [Cr55-L)4X2] (X = Cl, L = dppzda2 (1), dpzpda2 (2); X = NCS, L = dppzda2 (3), dpzpda2 (4)) were designed and synthesized through pyrazine-modulation of tripyridyldiamine ligand. X-Ray crystallographic studies revealed a linear metal chain structure consisting of two quadruple Cr–Cr bonds and a separated high spin Cr(II) at an end in crystallized form. A quintet ground state was observed for all pentachromium(II) molecules by magnetic study with g values of 2.04–2.18. While the electronic structure remained unchanged after the modification of ligands, electrochemistry showed a significant change in the molecular orbital energy levels of metal string molecules. Observation of the first oxidation peak of 1 at +0.57 V and of 2 at +0.73 V revealed that these complexes are quite resistant to oxidation. Single molecular conductance measurements showed that the complex exhibited good electronic conductance.

Graphical abstract: Fine tuning of pentachromium(ii) metal string complexes through elaborate design of ligand

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Publication details

The article was received on 11 Jun 2011, accepted on 31 Oct 2011 and first published on 05 Dec 2011


Article type: Paper
DOI: 10.1039/C1NJ20512A
Citation: New J. Chem., 2012,36, 632-637
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    Fine tuning of pentachromium(II) metal string complexes through elaborate design of ligand

    W. Wang, R. H. Ismayilov, G. Lee, Y. Huang, C. Yeh, M. Fu, C. Chen and S. Peng, New J. Chem., 2012, 36, 632
    DOI: 10.1039/C1NJ20512A

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