Unusual Luminescence of Hexapyrrolidine Derivatives of C₆₀ with T_h and Novel D₃-Symmetry

Photophysics and Photochemistry of a Water-Soluble C60 Dendrimer: Fluorescence Quenching by Halides and Photoinduced Oxidation of I-

“…720 nm. The recorded absorption spectrum is similar to those reported for other C 60 monoderivatives: 11b, [19][20][21][22][23][24][25][26] It is broader and extends to longer wavelengths than that of C 60 and shows the same characteristic sharp peak at ∼430 nm, absent in C 60 . 20 The determined molar absorption coefficients are in good agreement with reported values.…”

Synthesis and light-emitting properties of C60-containing poly(1-phenyl-1-butyne)s

“…We have repeatedly measured the PL spectra of the copolymers and con®rmed that the results were well reproducible within experimental error. GrarciaGaribay, Rubin and co-workers have recently synthesized highly luminescent low molecular weight C 60 derivatives [22]. Our work, thus, represents a new example of highly luminescent high molecular weight C 60 polymer.…”

Synthesis, EPR and ENDOR of [60]Fulleropyrrolidine Bisadducts with Nitroxide Addends: Magnitude and Sign of the Exchange Interaction

“…Derivatives 6 ± 10 were synthesized via the [32] dipolar cycloaddition of azomethine ylides [12] to C 60 by a modified procedure of Schick et al [13] Thus, C 60 in 1,2-dichlorobenzene was treated with acetone and 2-aminoisobutyric acid at 180 8C for 2 h in the presence of anhydrous Na 2 SO 4 . The mixture of NH-fulleropyrrolidines was purified from unreacted C 60 (eluent: toluene, 16 %), from the monoaddition product 2,2,5,5-tetramethylfulleropyrrolidine (eluent: toluene/ethyl acetate 95/5, 29 %) and, partially, from traces of higher molecular weight adducts by SiO 2 flash column chromatography.…”

“…Oxidation with MCPBA in toluene at room temperature gave the binitroxides 1 ± 5 that were isolated by semipreparative HPLC on a SiO 2 column (5 mm (Phenomenex Primesphere), 250 Â 10 mm 2 , toluene/ethyl acetate mixtures). The binitroxides were identified by comparison of their absorption spectra with those of the corresponding bis-2,2,5,5-tetramethylpyrrolidines, [13] bis-N-methylfulleropyrrolidines, [14] and bis mTEG-fulleropyrrolidines, [15] respectively, and by mass spectrometry. The purity was checked by analytical HPLC.…”