A μ 3-alkoxo-bridged tetranuclear [Cu 4L 2] copper(II) complex of a hexadentate N2O4 donor ligand with a [6 + 0] Cu4O4 cubane core: Synthesis, crystal structure, and magnetic properties

Dipankar Maity, Atish D. Jana, Mainak Debnath, Nigel G.R. Hearns, Ming Han Sie, Hon Man Lee, Rodolphe Clérac, Mahammad Ali

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Abstract

A novel hexacoordinating non-Schiff base ligand (H 4L) with N 2O 4 donor atoms has been synthesized by simple Mannich reactions. The use of this ligand with Cu(ClO 4) 2* 6H 2O in different molar ratios as well as pH leads to the formation of a mononuclear species and a tetranuclear CuII complex possessing a cubane [Cu 4L 2] core with almost equal Cu...Cu separation. In the presence of an excess amount of copper(II) ions and triethylamine at reflux, the mononuclear [CuH 2L] species can be converted into the tetranuclear one, whereas the reverse process was not observed even after prolonged reaction time. Both the complexes have been characterized by single-crystal X-ray diffraction and magnetic measurements. Magnetic studies reveal that complex 1 displays a paramagnetic Curie-type behavior whereas 2 displays a singletspin ground state induced by strong intramolecular antiferromagnetic interactions.

Original languageEnglish
Pages (from-to)3484-3490
Number of pages7
JournalEuropean Journal of Inorganic Chemistry
Issue number22
DOIs
Publication statusPublished - 2010 Jan 1

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All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry

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