Lead(II) and cadmium(II) complexes of 3-(2-pyridyl)-5,6-diphenyl-1,2,4-triazine-p,p′-disulfonate with high thermal stability

Abstract

Pb(II) and Cd(II) complexes, {[Pb₂(PDTS)₂(CH₃OH)((H₂O)₂]⋅ H₂O} _n (1) and [Cd(PDTS)(H₂O)₄]⋅ 2H₂O (2) (PDTS²⁻ = 3-(2-pyridyl)-5,6-diphenyl-1,2,4-triazine-p,p′-disulfonate), are synthesized and characterized by elemental analysis, infrared (IR), ¹H-NMR spectroscopy, and thermal analysis. The single-crystal structure of 1 shows that the complex forms a 2-D polymeric network containing two types of Pb²⁺ with coordination number eight (PbN₂O₆). Both possess hemidirected coordination geometries. The single-crystal structure of 2 shows distorted octahedral geometry for cadmium(II), CdN₂O₄. These compounds are the first complexes of “PDTS²⁻”. The supramolecular features in these complexes are guided/controlled by hydrogen bonding and noncovalent intermolecular interactions.

Keywords:

• Lead(II)
• Cadmium(II)
• 1,2,4-Triazine
• Hydrogen bonding

Acknowledgments

Support of this investigation by Payame Noor University is gratefully acknowledged by FM. HKF would like to thank the Malaysian Government and Universiti Sains Malaysia for the University Golden Goose Fund (Grant no. 1001/PIZIK/811012). CKQ thanks Universiti Sains Malaysia for a research fellowship.