A New Method of Synthesis of Polythiols Schiff Base with Sulphur and Azomethine Donors and their Characterizations by Willgeordt Kindller

Ambreen Shah; Mehtab Mirrani; G. Zuhra Memon

Ambreen Shah M.A. Kazi. Institute of Chemistry, University of Sindh, Jamshoro, Sindh, Pakistan
Mehtab Mirrani M.A. Kazi. Institute of Chemistry, University of Sindh, Jamshoro, Sindh, Pakistan
G. Zuhra Memon M.A. Kazi. Institute of Chemistry, University of Sindh, Jamshoro, Sindh, Pakistan

Keywords: polythiols, synthesis, Willgerodt Kindler (WK) reaction, FT-IR, TG/DTA, enthalpy

Abstract

Some new polythiols were derived from aromatic aldehyde (2-hydroxy benzaldehyde) and different diamines (semicarbazide, 4-phenyl, 3-thiosemicarbazide, 4-4'-oxydianiline and N, N'- dimethyl p-phenylenediamine), in the presence of elemental sulphur.The process of condensation is carried out by the Willgerodt Kindler (WK) reaction of azomethine donor or derivatives with elemental sulphur in the presence of a strong base as a catalyst. The polythiols (polythioamides) were characterized by different techniques like elemental micro analysis, FTIR, UV- Vis spectroscopies, thermal analysis and viscosity measurement. The FT-IR showed the main band around 1235-1265/cm-1 because of the formation of thiol groups in respected polythiols to vC=S vibrations. The polythiols indicated improved thermal solidity up to 600 °C. These polythiols were soluable in highly polar organic solvents due to their complex structures. The intrinsic visco-metrical data of these polythiols reached about 0.393-0.5201 dL/g in THF.