title: Novel pyrromethene dyes with N-ethyl carbazole at the meso position: a comprehensive photophysical, lasing, photostability and TD-DFT study.
abstract: Two novel BODIPY (pyrromethene, PM) dyes containing N-ethyl carbazole at the meso position are synthesized and their photophysical properties in different solvents and the photochemical stabilities and laser performances in n-heptane are investigated. The n-heptane solution of the dyes was used as a gain medium in a constructed narrow band dye laser, pumped by a Q-switched (10 Hz) frequency-doubled (532 nm) Nd:YAG laser and the results gave enhanced photo stabilities and similar peak efficiencies of the synthesized dyes as compared to parent dye PM567. When substituted at the meso position with N-alkyl carbazole, photostability is found to be increased in comparison to PM567, and also when substituted at 2- and 6-positions with a benzyl group instead of an ethyl group along with N-ethyl carbazole at the meso position, the photo stability is further increased in n-heptane. A comprehensive study on structural, photophysical and electronic properties of dyes by means of DFT and TD-DFT in the solvents of various polarities has revealed remarkable characteristics of the BODIPY chromophore.
authors.affiliation: Dyestuff Technology Department, Institute of Chemical Technology, Mumbai-400019, India. nethi.sekar@gmail.com.
authors.forename: Kishor G
authors.initials: KG
authors.lastname: Thorat
authors.forename: Priyadarshani
authors.initials: P
authors.lastname: Kamble
authors.forename: Alok K
authors.initials: AK
authors.lastname: Ray
authors.forename: Nagaiyan
authors.initials: N
authors.lastname: Sekar
mesh_terms: D002227:Carbazoles / Q000737:chemistry*; D007834:Lasers; D015394:Molecular Structure; D055668:Photochemical Processes; D011162:Porphobilinogen / Q000737:chemistry*; D011789:Quantum Theory
chemical_list: D002227:Carbazoles; C000606079:N-ethyl carbazole; D011162:Porphobilinogen