The first synthesis of the oxazolidinofullerene 2 has been achieved by cycloaddition of C-60 with N(3)CO(2)Et, followed by the treatment of the product with BBr3 at room temperature. The structure of 2 was unambiguously established by spectroscopic means (C-13 NMR and MS). Methylcyclohexane solutions of aziridinofullerene 1a and oxazolidinofullerene 2 exhibited, at ambient temperature, fluorescence emission at lambda(max) 686 and 691 nm, respectively. with vibronic fine structure. The fluorescence lifetimes and quantum yields for 1a and 2 have been measured.
The first synthesis of the oxazolidinofullerene 2 has been achieved by cycloaddition of C-60 with N(3)CO(2)Et, followed by the treatment of the product with BBr3 at room temperature. The structure of 2 was unambiguously established by spectroscopic means (C-13 NMR and MS). Methylcyclohexane solutions of aziridinofullerene 1a and oxazolidinofullerene 2 exhibited, at ambient temperature, fluorescence emission at lambda(max) 686 and 691 nm, respectively. with vibronic fine structure. The fluorescence lifetimes and quantum yields for 1a and 2 have been measured.
Fluorescence of fullerene derivatives at room temperature
作者:Syh-Kun Lin、Lung-Lin Shiu、Kuo-Ming Chien、Tien-Yau Luh、Tsung-I Lin
DOI:10.1021/j100001a019
日期:1995.1
The absorption and fluorescence spectral properties of fullerene (C-60) and its derivatives C60C4H6, C60C5H6, C(60)CHCO(2)Et, and C(60)NCO(2)Et at room temperature were investigated. Breaking the structural symmetry of C-60 results in enhancing the fluorescence quantum yield 2-3-fold in some derivatives. Thus, the room temperature fluorescence of fullerene compounds could be detected more readily. New absorption bands and altered fluorescence spectra were observed in the derivatives. The Stokes' shifts of the derivatives are small, about 4-5 nm, compared to 68 nm for the parent compound. The time-resolved fluorescence decay study indicates that all four fullerene derivatives have a single fluorescence lifetime of ca. 1.2-1.4 ns, which is about the same as that for C-60 (ca. 1.3 ns). Aliphatic solvents have little influence on the absorption or fluorescence spectral profile except on the extinction coefficient whereas aromatic and polar solvents strongly interact with the fullerene derivatives, causing a peak broadening effect.
Chemical transformations on the surface of [60]fullerene: Synthesis of [60]fullereno[1′,2′:4,5]oxazolidin-2-one
作者:Malcolm R. Banks、J.I.G. Cadogan、Ian Gosney、Philip K.G. Hodgson、Patrick R.R. Langridge-Smith、John R.A. Millar、Alan T. Taylor
DOI:10.1016/0040-4039(94)88429-3
日期:1994.11
acids has been used as a mild source of nitrenes for capture by [60]fullerene; rearrangment of the resulting [60]fullereno[1′,2′:2,3]aziridine bearing a N-ethoxycarbonyl grouping under the influence of phenol/chlorotrimethylsilane results in the quantitative formation of the title compound which can be cleaved to yield 1-hydroxy-2-N-methylamino[60]fullerene.