Analysis of molecular structure, spectroscopic properties (FT-IR, micro-Raman and UV-vis) and quantum chemical calculations of free and ligand 2-thiopheneglyoxylic acid in metal halides (Cd, Co, Cu, Ni and Zn)

The metal halide complexes (Cd, Co, Cu, Ni and Zn) of 2-thiopheneglyoxylic acid molecule were synthesized by following reactions: