title: A photophysical study of terphenyl core oligosulfonimide dendrimers exhibiting high steady-state anisotropy.
abstract: The photophysical properties of three dendrimers containing a p-terphenyl core with appended sulfonimide branches of different size and n-octyl chains have been investigated in dichloromethane solution. In the dendrimer absorption spectra contributions from both the branches and the core are clearly identified. The fluorescence spectra show only the characteristic fluorescence of the terphenyl unit. Energy transfer from the appended chromophoric groups to the core does not occur. In the dendrimers, the terphenyl core exhibits a very high fluorescence quantum yield (ca. 0.75) and a short emission lifetime (0.8 ns). These properties allowed investigations of the fluorescence depolarization caused by rotation of the dendrimers. The dendrimers show a very high steady-state anisotropy in dichloromethane solution at room temperature (0.24 for the largest one), compared to that of the parent terphenyl under the same experimental conditions (<0.01) and in rigid matrix (0.33). Both the n-octyl chains and the sulfonimide branches play important roles to slow down the molecular rotation.
authors.affiliation: Dipartimento di Chimica "G. Ciamician", Università di Bologna via Selmi 2, 40126 Bologna, Italy.
authors.forename: Giacomo
authors.initials: G
authors.lastname: Bergamini
authors.forename: Paola
authors.initials: P
authors.lastname: Ceroni
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Balzani
authors.forename: Maria Del Mar
authors.initials: Mdel M
authors.lastname: Villavieja
authors.forename: Ramchandra
authors.initials: R
authors.lastname: Kandre
authors.forename: Igor
authors.initials: I
authors.lastname: Zhun
authors.forename: Oleg
authors.initials: O
authors.lastname: Lukin
mesh_terms: D016880:Anisotropy; D002627:Chemistry, Physical / Q000379:methods*; D050091:Dendrimers; D008027:Light; D008752:Methylene Chloride / Q000737:chemistry; D008956:Models, Chemical; D008968:Molecular Conformation; D015394:Molecular Structure; D010777:Photochemistry / Q000379:methods*; D013050:Spectrometry, Fluorescence; D013053:Spectrophotometry / Q000379:methods*; D013452:Sulfonium Compounds / Q000737:chemistry*; D013696:Temperature; D013730:Terphenyl Compounds / Q000737:chemistry*; D013997:Time Factors
chemical_list: D050091:Dendrimers; D013452:Sulfonium Compounds; D013730:Terphenyl Compounds; D008752:Methylene Chloride