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