The objective of the present work is to analyze the effect of picric acid on Optical quality single crystals of Bisthiourea Manganese Chloride (PBTMC) have been grown by slow evaporation growth technique using water as solvent. The influence of picric acid has a tendency to improve the crystalline perfection into a significant level. The coordination of thiourea with divalent transition metal ions takes place through Sulphur atom and picric acid. A detailed Comparision of vibrational data of PBTMC with similar metal complex revealed that the inclusion of picric acid in the formation of solid complexes was confirmed by means of FTIR Spectroscopy. The opticalstudies of the crystals was determined by UV- Visible studies. Areduction in the lower cutoff frequency is observed in the optical absorption spectrum of PBTMC which recommends the crystal for optoelectronic application. Dielectric behaviour of these crystals show very low value of dielectric constant at higher frequencies and increases their possibilities towards NLO devices. The significance of this work results a good pathway to make it potentially useful for NLO applications.