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

Sangita Ray, Saugata Konar, Atanu Jana, Sankar Jana, Amarendra Patra, Sudipta Chatterjee, James A. Golen, Arnold L. Rheingold, Sudhanshu Sekhar Mandal, Susanta Kumar Kar

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67 Scopus citations

Abstract

One new dinuclear Zn(II) complex, [(N 3)Zn(L 1) (μ 1,1-N 3)] 2 (1), and a dinuclear Cd(II) complex, [(N 3)Cd(L 1)(μ 1,1-N 3)] 2 (2), of the potentially tridentate NNN-donor Schiff base ligand N-(4,6-dimethyl-pyrimidin-2-yl)-N′-(1-pyridin-2-yl-ethylidine) -hydrazine (L 1) and another dinuclear Cd(II) complex [(NCS)Cd(L 2)(μ 1,3-NCS)] 2 (3) of a similar NNN donor Schiff base ligand, N-(4,6-dimethyl-pyrimidin-2-yl)-N′-pyridin-2- ylmethylene-hydrazine (L 2), have been synthesized and characterized by elemental analyses, IR, 1H NMR, fluorescence spectroscopy and single crystal X-ray crystallography. The fluorescence spectral changes observed upon addition of the Zn(II) ion to a mixture of L 1 and azide showed high selectivity towards the Zn(II) ion over other metal ions. The ligands L 1 and L 2 are [1 + 1] condensation products of 2-hydrazino-4,6-dimethyl pyrimidine with 2-acetyl pyridine and pyridine-2-carbaldehyde, respectively. In the complexes 1 and 2 the two Zn(II) and Cd(II) centers are held together by μ 1,1-bridged azide ions, while in 3 the two Cd(II) centers are bridged by μ 1,3-thiocyanate ions. Complex 1 shows high chelation enhanced fluorescence compared to 2 and 3. All the metal centers have a distorted octahedral geometry.

Original languageEnglish
Pages (from-to)82-89
Number of pages8
JournalPolyhedron
Volume33
Issue number1
DOIs
StatePublished - 9 Feb 2012

Keywords

  • H NMR
  • Emission properties
  • Pyrimidine derived ligands
  • X-ray crystal structures
  • Zinc(II) and cadmium(II) complexes

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