Signaling Recognition Events with Fluorescent Sensors and Switches.

Aggregation-induced emission: phenomenon, mechanism and applications.

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Principles Of Fluorescence Spectroscopy

6. Rehybridization of the Acceptor (RICT) 3908 7. Planarization of the Molecule (PICT) 3909 III. Fluorescence Spectroscopy 3909 A. Solvent Effects and the Model Compounds 3909 1. Solvent Effects on the Spectra 3909 2. Steric Effects and Model Compounds 3911 3. Bandwidths 3913 4. Isoemissive Points 3914 B. Dipole Moments 3915 C. Radiative Rates and Transition Moments 3916 1. Quantum Yields and Radiationless Deactivation Processes 3916

Structural Changes Accompanying Intramolecular Electron Transfer: Focus on Twisted Intramolecular Charge-Transfer States and Structures

Optical second-harmonic generation and the related technique of infrared – visible light sum-frequency generation are extremely versatile tools for studies of many kinds of surfaces and interfaces. With the help of ultra-short laser pulses, they can be used to monitor surface dynamics and reactions with sub-picosecond time resolution.

Surface properties probed by second-harmonic and sum-frequency generation

Dielectric Relaxation and Solvation Dynamics of Water in Complex Chemical and Biological Systems

Water molecules confined in a supramolecular assembly control reactivity and dynamics of biological systems in a unique way. In a confined system, water molecules display an ultraslow component of solvation which is slower than that in bulk water by 2−4 orders of magnitude. The ultraslow component arises mainly from the disruption of the hydrogen-bond network of water and the binding of water molecules to a macromolecule. The ultraslow component of solvation markedly retards polar reactions. Many examples of slow dynamics in complex systems, and their implications in biological and natural processes are discussed.

Solvation dynamics and proton transfer in supramolecular assemblies.

Environmental and magnetic field effects on exciplex and twisted charge transfer emission

Although water is often hailed as the lubricant of life, a detailed understanding of its role in many chemical and biological processes still eludes us. In many natural systems, water is confined in an environment where its free movement is restricted and its three-dimensional hydrogen-bonded network is disrupted. Very recently, several groups applied ultrafast laser spectroscopy to study the dynamics of the constrained water molecules. It is observed that the dynamic behavior of the confined water molecules is markedly different from that of the ordinary water molecules. The most striking result is the bimodal response of confined water, with one bulk water-like subpicosecond component and a much slower component in a time scale of hundreds or thousands of picoseconds. This slow second component constitutes 10−30% of the total response and is crucial in the understanding of the role of water in complex chemical and biological processes. The origin of the slow component has been a subject of intense recen...

Slow dynamics of constrained water in complex geometries

The picosecond time-resolved Stokes shift of the laser dye coumarin 480 (I) is studied in Aerosol OT-heptane reverse micelles at various concentrations of water. On addition of water to a n-heptane solution of I containing 0.09 M AOT, the emission spectrum of I exhibits a prominent shoulder at 480 nm which is ascribed to the dye molecules in the water pool of the reverse micelles. In n-heptane, the fluorescence decays of I at short and long wavelengths are identical, which rules out any time-resolved Stokes shift. On addition of water to the AOT/heptane system, the decay at long wavelengths exhibit a distinct growth on the nanosecond time scale. This and the time-dependent Stokes shift indicate that the water molecules in the water pool of the AOT reverse micelles undergo slow relaxation on the nanosecond time scale.

Kankan Bhattacharyya

Papers

Dielectric Relaxation and Solvation Dynamics of Water in Complex Chemical and Biological Systems

Solvation dynamics and proton transfer in supramolecular assemblies.

Environmental and magnetic field effects on exciplex and twisted charge transfer emission

Slow dynamics of constrained water in complex geometries

Solvation Dynamics of Coumarin 480 in Reverse Micelles. Slow Relaxation of Water Molecules