TIFR
Department of Chemical Sciences
School of Natural Sciences

June 14, 2021 at 4.00 pm (Via Zoom)

Title :

Transient Raman Spectroscopy for Probing Charge Transfer States

Abstract :

Charge transfer (CT) states form the basis for multitude of chemical reactions, and has become relevant due to its ubiquity in all light energy conversion paradigms.[1] In order to discover new materials with optimized charge transfer rates at molecular interfaces for energy conversion technologies, it is imperative to diagnose the structure-function corrleations “in operando”. Tracking the non-equilibrium nuclear dynamics leading up to the charge transfer states and probing the subsequent separation of charges requires time-resolved spectroscopy with structural sensitivity. In this talk, I will discuss the utility of transient Raman spectroscopy as a tool to structurally probe the formation of CT states in molecular dyes with large Stokes shift,[2] and uncover the hidden lengthscale of the photochemistry inside the active site of metalloproteins.[3] Both frequency domain and time-domain methods will be elaborated with emphasis on challenges of real-time Raman detection during chemical reactions.

References

1. Sajjad Dadashi-Silab, Sean Doran and Yusuf Yagci; Chem. Rev. 2016, 116, 17, 10212–10275; Alexey V. Akimov, Amanda J. Neukirch and Oleg V. Prezhdo; Chem. Rev. 2013, 113, 6, 4496–4565.

2. Shreetama Karmakar, Abhinandan Ambastha, Ajay Jha, Aditya Dharmadhikari, Jayashree Dharmadhikari, Ravindra Venkatramani, and Jyotishman Dasgupta; J. Phys. Chem. Lett. 2020, 11, 12, 4842–4848.

 

3. Soumyajit Mitra, ASR Koti, and Jyotishman Dasgupta; to be submitted.