title: Impact of Structural Modification on the Photophysical Response of Benzoquinoline Fluorophores.
abstract: Structural influence on the photophysical behavior of two pairs of molecular systems from the biologically potent benzoquinoline family, namely, dimethyl-3-(4-chlorophenyl)-3,4-dihydrobenzo[f]-quinoline-1,2-dicarboxylate, dimethyl-3-(2,6-dichlorophenyl)-3,4-dihydrobenzo[f]quinoline-1,2-dicarboxylate and their corresponding dehydrogenated analogues has been investigated exploiting experimental as well as computational techniques. The study unveils that dehydrogenation in the heterocyclic rings of the studied quinoline derivatives modifies their photophysics radically. Experimental observations imply that the photophysical behavior of the dihydro analogues is governed by the intramolecular charge transfer (ICT) process. However, the ICT process is restricted significantly by the dehydrogenation of the heterocyclic rings. Computational exertion leads to the proposition that the change in the electronic distribution in these molecular systems on dehydrogenation is the rationale behind the dramatic modification of their photophysics.
authors.affiliation: Department of Chemistry, Jadavpur University, Kolkata, 700 032, India.
authors.forename: Pronab
authors.initials: P
authors.lastname: Kundu
authors.affiliation: Department of Chemistry, Jadavpur University, Kolkata, 700 032, India.
authors.forename: Saptarshi
authors.initials: S
authors.lastname: Ghosh
authors.affiliation: Department of Chemistry, Jadavpur University, Kolkata, 700 032, India.
authors.forename: Rajiv
authors.initials: R
authors.lastname: Karmakar
authors.affiliation: Department of Chemistry, Jadavpur University, Kolkata, 700 032, India.
authors.forename: Gourhari
authors.initials: G
authors.lastname: Maiti
authors.affiliation: Department of Chemistry, Jadavpur University, Kolkata, 700 032, India. nitin.chattopadhyay@yahoo.com.
authors.forename: Nitin
authors.initials: N
authors.lastname: Chattopadhyay
keywords: Benzoquinoline; Charge distribution; Dehydrogenation; Intramolecular charge transfer; Photophysics