“…The metal ligand bonding in organometallics gives rise to the large macroscopic nonlinearities and excellent physicochemical stabilities due to the transfer of electron density between the metal atoms and the conjugated ligand systems [7]. Crystals such as cadmium mercury thiocyanate (CMTC) [1], manganese mercury thiocynate (MMTC) [8], zinc mercury thiocynate (ZCTC) [9] and diaquatetrakis (thiocyanato) manganese (II) mercury (II) N-methyl-2-pyrolidone (MMTWMP) [10] belongs to this category of materials. Though there are detailed reports on CMTC, MMTC, ZCTC and MMTWMP, no systematic study on the physicochemical properties of CMTWMP has been reported.…”