Synthesis of IIB group derived of N-methyl caprolactam-3-dithiocarboxylic acid complexes: thermal properties

Abstract

The synthesis of N-methylcaprolactam-3-dithiocarboxylic acid complexes with the non transition metals Zn(II), Cd(II) and Hg(II) were carried out and the complexes characterized using FT–IR, Raman, XRD, SEM, EDS and elemental analyses. The IR results confirm the link between the caprolactam and the dithiocarboxylate through the C–S bond, whereas Raman spectroscopy gave information about the S–M stretch for each complex. X-ray diffraction analysis shows that the complexes adopt tetrahedral coordination geometry. The SEM showed the morphology of the complexes and the EDS gave a semi-quantitative analysis of the complexes. A comparative study was made among the complexes observing their thermal stability using TGA and DSC. Thermogravimetric study (TGA) indicated different stability of the complexes with the zinc(II) complex most stable.

Keywords:

• Dithiocarboxylic acids
• Caprolactam
• Complexes
• Transition and non transition metals

Acknowledgements

This work was supported by Universidad Autónoma del Estado de México (SIyEA-UAEM, 2239/2006), PROMEP, 1352/2005. Technical Support María Magdalena García Fabila, Ruth Salinas Gómez, Jorge Pérez del Prado, Marco Antonio Camacho López, Susana Hernández López, Fernando Cortés-Guzmán.