Three new pseudohalide bridged dinuclear Zn(II) Schiff base complexes: Synthesis, crystal structures and fluorescence studies

Subhra Basak, Soma Sen, Sambuddha Banerjee, Samiran Mitra, Georgina Rosair, M. T G Rodriguez

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117 Citations (Scopus)

Abstract

Three new dinuclear Zn(II) complexes [Zn(L)(µ1,1-N3)Zn(L)(N3)] · 1.5H2O (1), [Zn(L)(µ1,1-NCO)Zn(L)(NCO)] · 1.5H2O (2) and [Zn(L)(µ1,1-NCS)Zn(L)(NCS)(OH2)] (3) have been synthesized from a potentially tetradentate N2O2-donor Schiff base ligand LH, [LH = (OCH3)(OH)C6H3CHN(CH2)2N(CH3)2], which is the condensation product of o-vanillin and 2-dimethylaminoethylamine. All the three complexes 1, 2 and 3 have been characterized by elemental analysis, IR and 1H NMR spectroscopy, TGA and fluorescence studies. Finally, their structures have been established by the single crystal X-ray diffraction method. Structural studies reveal that in complexes 1, 2 and 3 the two Zn(II) centers are held together by a µ2-phenolato oxygen atom and also by an end-on pseudohalide nitrogen (azide for 1; cyanate for 2; thiocyanate for 3) atom. Among the two deprotonated Schiff base ligands present in each complex, one acts as a tetradentate ligand (N2O2 donor set) while the other acts as a tridentate ligand (N2O donor set), having a non-coordinated methoxy group. All the synthesized complexes display intraligand 1(p-p*) fluorescence and can potentially serve as photoactive materials. © 2007 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)5104-5112
Number of pages9
JournalPolyhedron
Volume26
Issue number17
DOIs
Publication statusPublished - 30 Oct 2007

Keywords

  • μ 2 -Phenolato and end-on pseudohalide bridged complexes
  • Crystal structures
  • Dinuclear zinc(II)
  • Fluorescence
  • Potentially tetradentate Schiff base ligand

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