M.Sc (IIT M), Ph.D (BARC)
Research Assistant Professor
My Views and Philosophies
I consider myself as a Chemist in the contest of Research Activities. Because I believe in Interdisciplinary Research (boundary-less disciplines/subjects), which could pave the way of creating novel and cutting-edge science that would lead the outcomes to product stage. Moreover, without teaching the role of a faculty is incomplete. While Teaching is concerned, I would like to involve myself more on ‘Organic Chemistry’-related courses for the proper utilization of my expertise and basic knowledge. Teaching and research have long been debated with regard to their competition or complementarities in the educational environment. My philosophy matches here with the following - “educating students through conducting research”, instead of “educating students and conducting research”. That way I believe teaching objectives and research objectives better support one another.
Research Grants: DST-SERB Early Career Research Award (Status: In progress)
Notable Research Achievements
Light-controlled Self-assembly of Non-photoresponsive Nanoparticles
Nature Chemistry, 2015, 7, 646-652
News Highlights: Organic molecular switches namely, protonated-merocyanine was shown to modify the pH of a methanolic medium reversibly when exposed to visible light on or off - in such a way that the nanoparticles which do not respond to external stimuli such as light undergo self-assemble / deassemble process in a reversible fashion depending on the state of the external switch. Performing the assembly process in thin films of gels allowed us to draw images that spontaneously disappeared after a specific period of time.
Multi-responsive Nano-porous Materials
Nature Communications, 2014, 5, 3588
Majority of organic molecular switches require conformational freedom to isomerize, and therefore, switching in the solid state is prohibited. Here we describe two families of nanoporous materials incorporating the spiropyran molecular switch. These materials exhibit a variety of interesting properties, including reversible photo-chromism and acidochromism, light-controlled capture and release of metal ions, as well reversible chromism induced by solvation/desolvation.
Thermal Equilibriation of an Axially Chiral Bis-spiropyran Leading to Cyclic Kinetics
J.Am. Chem. Soc., 2014, 136, 11276-11279
A compound combining the features of a molecular rotor and a photoswitch was synthesized and was shown to exist as three diastereomers, which interconvert via a reversible cyclic reaction scheme. Each of the three diastereomers was isolated, and by following the equilibration kinetics, activation barriers for all reaction were calculated. The results indicate that the properties of molecular switches depend heavily on their immediate chemical environment. The conclusions are important in the context of designing new switchable molecules and materials.
Controlling the Lifetimes of Dynamic Nanoparticle Aggregates by Spiropyran Functionalization
Nanoscale, 2016, 8, 19280-19286
Novel light-responsive nanoparticles were synthesized by decorating the surfaces of gold and silver nanoparticles with a nitrospiropyran molecular photoswitch. Upon exposure to UV light in nonpolar solvents, these nanoparticles self-assembled to afford spherical aggregates, which disassembled rapidly when the UV stimulus was turned off. By coating the nanoparticles with a spiropyran lacking the nitro group, a conceptually different self-assembly system, relying on a reversible proton transfer, was realized. The resulting particles spontaneously (in the dark) assembled into aggregates that could be readily disassembled upon exposure to blue light.
Reversible Trapping and Reaction Acceleration within Dynamically Self-assembling Nanoflask
Nature Nanotechnology, 2016, 11, 82-88
Current Research Interest
Photochromic Molecular Switches / Motors / Machines are one of the top most interests among a variety of scientists. Researchers are concerned about investigation of its basic properties as well as its application potential. It brings together scientists from a variety of domains in chemistry, physics and engineering. It requires a multidisciplinary approach, which bridges organic, inorganic and physical chemistry as well as molecular, supramolecular and solid state chemistry.
Photochromism is the reversible transformation of a chemical species (stimuli-responsive) between two forms having dissimilar absorption spectral profiles (and unalike properties), with at least one of the formation reactions being driven by light absorption and therefore the species is an “on-off” switch.
In my group, we are interested in the following areas…..
Journal Publications (Best Five)
Other Journal Publications
Symposiums and Conferences
Invited Talks in India (Selected)
Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal
Department of Chemical Sciences, TIFR, Mumbai
Department of Chemistry, Indian Institute of Technology (IIT) Delhi
TIFR Centre for Interdisciplinary Sciences (TCIS), Hyderabad
Indian Institute of Science Education and Research (IISER) Kolkata
Department of Chemistry, Indian Institute of Technology (IIT) Kharagpur
Department of Chemistry, Indian Institute of Technology (IIT) BHU
Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali
5. Organic Chemistry-III: M.Sc., III Semester, SRM Institute of Science and Technology (formerly known as SRM University)
[Spectroscopy of Organic Compounds: UV-visible spectroscopy, Infrared spectroscopy, 1H NMR spectroscopy, 13C NMR spectroscopy and Mass Spectrometry]
4. Organic Chemistry-II: M.Sc., II Semester, SRM Institute of Science and Technology (formerly known as SRM University)
[Addition reactions, Elimination reactions, Hydrolysis and esterifications, Rearrangements, Photochemistry, and Pericyclic reactions]
3. Principles of Environmental Science: B.Tech. II Semester, ECE, SRM Institute of Science and Technology (formerly known as SRM University)
2. Principles of Environmental Science: B.Tech. I Semester, CSE, SRM Institute of Science and Technology (formerly known as SRM University)
1. Chemistry Practical Classes: B.Tech, IIT Bombay
Ph.D and Post Doctoral Position: Suitable candidates may contact the PI