Heterocyclic compound of (4-oxothiazolidin-2-ylidene) acetonitrile was prepared in powder form. The crystalline
nature of the prepared sample was checked by X- ray diffraction (XRD). IR absorption spectra were recorded on a
Shimadzu 440 infrared spectrophotometer (cm-1) using the KBr technique (Shimadzu, Japan). Reflection spectra
of the powder sample were obtained in the wavelength range (200-2500 nm) at room temperature using spectrophotometer.
Absorption and transmission spectra of the prepared sample were obtained in different solvents in
the wavelength range (190-1100nm).The solvent used are acetone, dimethyformamid (D.M.F.) and glycerol. The
measurements were carried out at room temperature using (JENWAY 6405 UV/VIS) spectrophotometer. The optical
energy gap which is the difference between lowest unoccupied molecular orbital (LUMO) and highest occupied
molecular orbital (HOMO) was estimated. The effect of the solvent dielectric constant on optical band gap was
discussed.