Crystal Structures of the Complexes of Zn(II), Cd(II), and Hg(II) with 1,2,5-Selenadiazolopyridine: Ligation of N vs Se ?

  • Puspendra Singh
  • Sagar Sharma
  • Harkesh B. Singh
  • Ray J. Butcher
Research Article

DOI: 10.1007/s40010-014-0146-4

Cite this article as:
Singh, P., Sharma, S., Singh, H.B. et al. Proc. Natl. Acad. Sci., India, Sect. A Phys. Sci. (2014) 84: 269. doi:10.1007/s40010-014-0146-4

Abstract

The coordination ability of 1, 2, 5-selenadiazolopyridine (psd) towards MCl2 (M = Zn, Cd, Hg), and HgBr2 has been investigated. The 2:1 reactions of psd with MCl2 and HgBr2 afforded dimeric [(psd)2ZnCl2]2, polymeric [(psd)2CdCl2]n and monomeric (psd)2HgBr2 complexes. The 1:1 reactions of psd with HgX2 (X = Cl, Br), gave only polymeric complexes i.e. [(psd)HgX2]n. Single crystal X-ray diffraction studies of the complexes reveal that psd ligand coordinates to the metal ions either through azole N or pyridine N. In no case, coordination through the selenium donor was observed. These observations are also supported by DFT calculations. Complex [(psd)2CdCl2]n is a 3D supramolecular framework extended by Cl→Cd dative bond, Se···Npy secondary bonding and C–H···Cl hydrogen bonding interactions.

Keywords

1,2,5-SelenadiazolopyridineSupramolecular frameworkBenzoselenadiazoleSelenophilicitySoft metal ions

Copyright information

© The National Academy of Sciences, India 2014

Authors and Affiliations

  • Puspendra Singh
    • 1
  • Sagar Sharma
    • 1
  • Harkesh B. Singh
    • 1
  • Ray J. Butcher
    • 2
  1. 1.Department of ChemistryIndian Institute of Technology BombayMumbaiIndia
  2. 2.Department of ChemistryHoward UniversityWashingtonUSA