A study on the photophysics of 9-amino-10-cyanoanthracene: probing its dual absorption and emission behavior

Literature Information

Publication Date 2014-04-17
DOI 10.1039/C4CP00865K
Impact Factor 3.676
Authors

Sharmistha Dutta Choudhury, Sukumaran Muralidharan, Haridas Pal


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Abstract

The photophysics of a donor–acceptor substituted chromophore, 9-amino-10-cyanoanthracene (ACAN), has been investigated in polar and nonpolar solvents to understand its intriguing dual absorption and emission behavior. Steady-state and time-resolved fluorescence studies clearly indicate that the short wavelength emission band of ACAN arises from the higher excited singlet state, S2, while the longer wavelength emission band arises from the intramolecular charge transfer (ICT) state, S1. Interestingly, both these states can be populated by direct excitation from the ground state. Temperature dependent studies reveal a pronounced activation controlled nonradiative decay channel for the ICT state of ACAN. It is proposed that this activation controlled nonradiative de-excitation arises because of a large relative displacement and a cross-over of the potential energy (PE) surfaces of ACAN in the ground and the ICT states, as a result of different twist angles of the amino group in these two states. Qualitative PE diagrams have accordingly been presented to correlate and rationalize the observed results. The present study also brings to light the interesting excited state prototropic behavior of ACAN and the consequent modulation of the ICT emission that has not been reported in the literature so far.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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