|INDIAN INSTITUTE OF SCIENCE EDUCATION & RESEARCH, MOHALI|
Professor (Chemistry) & Dean (Students)
Knowledge city, Sector 81, SAS Nagar,
Manauli PO 140306
Matrix Isolation Infrared Spectroscopy:Our interest is in the study the infrared spectroscopy of molecules trapped in a solid inert gas matrix. The small linewidths of the infrared features observed in this technique allows for the study of molecular conformations and weak intermolecular adducts, such as hydrogen bonded and van der Waals complexes, which have been the focus of our research. We have been studying the conformations of organic phosphates, acetals and ketals, to understand the role of anomeric interactions in conformational preferences. These studies have thrown light on some of the chemical engineering problems encountered in the solvent extraction of metals using organic phosphates as extractants. We have also studied various hydrogen bonded systems, involving H-π interactions, such as acetylene-chloroform and acetylene-methanol. One of the unique features of the matrix isolation technique, is its ability to trap local minima and which therefore allowed us to study such structures. In some cases, we were also able to observe complexes whose stabilities were clearly enhanced by interactions with the matrix, and which therefore highlighted the role of the matrix in such studies.
Fluorescence spectroscopy of lanthanides: Our group is also interested in developing techniques for trace level detection of lanthanides and actinides and towards this end we have studied ligand sensitized fluorescence using various ligands. Recently, we have incorporated these ideas towards developing novel room temperature ionic liquids that could serve this purpose. The fluorescence enhancement observed using these methods have led to sub nanomolar detection of some of the lanthanides.