Sharda Sundaram Sanjay, Associate Professor, is currently working at the Department of Chemistry, in Ewing Christian College, University of Allahabad. The most recent publication is 'A Brief Manifestation of Nanotechnology.

Fe(III) forms charge-transfer complexes with several inorganic and organic ligands.  Charge-transfer complexes (CT- Complexes) are formed in case of molecular association as well as metal ligand complexes.  Studies on metal complexes with various ligands in different mixed solvents shows very interesting interactions . We have studied  a systematic study of 1:1 Fe(III)-thiocynate CT-Complex using both ultrasonic and spectrophotometric methods, in ethanol-water binary solvent mixture (ethanol-water mixture : 5%, 10%,15%, 20% and 25%) and determined ultrasonic parameters at RTP (298.15K). Since alcohols are Bronsted acids with similar strengths to water, it acs as good hydrogen bond donors and accepters. Therefore  serve as  “co-solvent” to provide better  solubility for the complxes. The separation and solvation of ions reduce the tendency of the complexed  ions to associate into aggregates, and ultimately, to precipitate as solids from solution. Through charge–dipole interactions, the dipole moment vectors of the complex in polar solvents orient in such a way so as to create an attractive stabilizing interaction with the charge and geometry of the complex ion.The stability constant and molar absorptivity coefficients of the charge transfer complex formed by Fe (III) with thiocynate ion were determined simultaneously using a graphical method developed in our laboratory. The changing trends in ultrasonic parameters are correlated with the various factors affecting it like hydrogen bonding, charge transfer interaction, dipole-dipole interaction, and Van der Waals interactions etc.  Depending on the molecular interactions and the nature of the liquid mixtures the change in the  molar volume is discussed in terms of molecular interactions and structural changes.