Ultrafast Excited State Relaxation Dynamics of New Fuchsine‐ a Triphenylmethane Derivative Dye

Biswas, Chinmoy and Rao Soma, Venugopal and Chetti, Prabhakar and Raavi, Sai Santosh Kumar (2021) Ultrafast Excited State Relaxation Dynamics of New Fuchsine‐ a Triphenylmethane Derivative Dye. ChemPhysChem, 22 (24). pp. 2562-2572. ISSN 1439-4235

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Abstract

An all-inclusive investigation of the ultrafast excited state relaxation dynamics of a triphenylmethane derivative molecule, New Fuchsine (NF), using a combined approach of density functional theory (DFT), femtosecond transient absorption spectroscopy (fs-TAS), and photoluminescence spectroscopy is presented in this work. The DFT calculations confirmed the formation of twisted molecular structure in the excited state of NF in ethanol solution with bond rotation of ≈86°. TAS measurements of NF solution exhibited ultrafast ground state-recovery pathway via a conical intersection confirming an ultrafast structural reorientation. On the contrary, TAS measurements of NF thin-film exhibited a longer excited-state lifetime suggesting a hindered molecular twisted state formed as an intermediate step. Photophysical kinetic models are proposed to globally fit the fs-TAS data establishing the twisted intramolecular charge transfer (TICT) state mediated ground state recovery for NF in solution and thin film, respectively. Temperature-dependent photoluminescence study of NF film provided a clear insight into the effect of rotational motion of phenyl rings in NF molecules over the TICT mediated emission. © 2021 Wiley-VCH GmbH.

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IITH Creators:

IITH Creators	ORCiD
Raavi, Sai Santosh Kumar	http://orcid.org/0000-0002-2496-9233

Item Type:

Article

Additional Information:

RSSK acknowledges the financial support from the following projects no's BRICS/PilotCall2/IEEE‐OSC/2018 (G) and CRG/2019/003197. CB thanks MHRD and IITH for financial support and infrastructure for this work. VRS acknowledges the financial support of DRDO, India through ACRHEM.

Uncontrolled Keywords:

anisotropy; femtosecond transient absorption spectroscopy; low-temperature photoluminescence; photoluminescence; triphenylmethane

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

06 Oct 2022 13:28

Last Modified:

06 Oct 2022 13:28