An ab initio and TD-DFT study of solvent effect contributions to the electronic spectrum of Nile Red

Literature Information

Publication Date 2009-04-03
DOI 10.1039/B902528F
Impact Factor 3.676
Authors

Patrick Owen Tuck, Robert Christopher Mawhinney, Manit Rappon


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Abstract

A CIS and TD-DFT study using a polarizable continuum solvent model has been conducted to assess non-specific solvent effects on the spectral shifts in Nile Red (NR). The results in this paper show that the electronic band shifts of Nile Red are a consequence of both a field effect on the transition energy and an effect due to a solvent induced geometry change. The S0→ S1 transition experiences a large red-shift with increasing solvent polarity but is relatively insensitive to geometric change. The TD-B3LYP assessment of the S0→ S2 transition yields a blue shift with increasing solvent polarity but a red shift due to the solvent induced geometry change. Ground state dipole moments and polarizabilities are also shown to increase with solvent polarity. CIS optimization of the first excited state of NR is reported, but the solvent effects suggest a locally excited state may have been obtained. Further studies are needed to assess the role of a TICT state.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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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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