title: Photophysical properties of a novel Ni(II)-diporphyrin in presence of fullerenes: insights from experimental and theoretical studies.
abstract: The present paper highlights the photophysical aspects of the topologically new Ni(II)-diporphyrin (Ni(2)-1)/fullerene host-guest ensembles. Both absorption and fluorescence studies reveal that Ni(2)-1 undergoes efficient complexation with both C(60) and C(70) in toluene medium. In the fluorescence study, remarkable enhancement of the fluorescence intensity of Ni(2)-1 was observed by the addition of C(60), while normal quenching of fluorescence occurred in case of C(70). From the fluorescence and UV-vis studies, the binding constants of Ni(2)-1 with C(60) and C(70) were determined to be approximately 1.7 x 10(4) and approximately 2.7 x 10(4) dm(3) mol(-1), respectively. Ab initio theoretical calculations reveal that C(70)/Ni(2)-1 complex favor end-on orientation of C(70) rather than side-on approach.
authors.affiliation: Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713104, West Bengal, India. sum_9974@rediffmail.com
authors.forename: Sumanta
authors.initials: S
authors.lastname: Bhattacharya
authors.forename: Masakazu
authors.initials: M
authors.lastname: Hashimoto
authors.forename: Akiko
authors.initials: A
authors.lastname: Fujimoto
authors.forename: Takahide
authors.initials: T
authors.lastname: Kimura
authors.forename: Hidemitsu
authors.initials: H
authors.lastname: Uno
authors.forename: Naoki
authors.initials: N
authors.lastname: Komatsu
mesh_terms: D037741:Fullerenes / Q000737:chemistry*; D007700:Kinetics; D008027:Light; D008665:Metalloporphyrins / Q000737:chemistry*; D008956:Models, Chemical; D009532:Nickel / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics
chemical_list: D037741:Fullerenes; D008665:Metalloporphyrins; D012997:Solvents; D009532:Nickel