biostudies-literatureYoungworth RNCRR NIH HHSNational Institute of General Medical SciencesNIGMS NIH HHS172-183https://www.ebi.ac.uk/biostudies/studies/S-EPMC11575487biostudies-literatureUnknown128(1)4-(<i>N</i>,<i>N</i>-Dimethylamino)benzonitrile (DMABN) is a luminescent probe that can be used for tracking changes in the surrounding solvent due to the large change in polarity between its ground and excited states. An important characteristic of DMABN is that it exhibits dual fluorescence with two different emission energies that can be monitored, allowing for better characterization of the surrounding system. The first excited state is called the locally excited (LE) state and is characterized by the movement of charge over the conjugated ring structure. In nonpolar solvents and in the gas phase, the fluorescence of DMABN is entirely attributed to the transition from the near-planar LE state. In more polar environments, emission occurs from both the LE and a second excited state, corrThe journal of physical chemistry. BSimulating the Fluorescence of the Locally Excited State of DMABN in Solvents of Different Polarities.PMC11575487R01-GM072558S10 RR019216R35 GM152124R01 GM072558Youngworth RRoux BfalseSimulating the Fluorescence of the Locally Excited State of DMABN in Solvents of Different Polarities.4-(<i>N</i>,<i>N</i>-Dimethylamino)benzonitrile (DMABN) is a luminescent probe that can be used for tracking changes in the surrounding solvent due to the large change in polarity between its ground and excited states. An important characteristic of DMABN is that it exhibits dual fluorescence with two different emission energies that can be monitored, allowing for better characterization of the surrounding system. The first excited state is called the locally excited (LE) state and is characterized by the movement of charge over the conjugated ring structure. In nonpolar solvents and in the gas phase, the fluorescence of DMABN is entirely attributed to the transition from the near-planar LE state. In more polar environments, emission occurs from both the LE and a second excited state, corr2024-01-01T00:00:00Z2024 Jan2025-04-04T20:38:56.885Z2025-04-04T20:38:56.885ZS-EPMC115754873811344510.1021/acs.jpcb.3c02975