Electron spin relaxation times of C−60 in solution

EPR and MMMA Study of C60upon K-Doping

“…A comparison of such results with the data obtained from EPR studies of electrochemically produced C60 radicals with different valences (υ) in solution [6][7][8] would permit verification of the EPR signals due to ion radicals of speciflc valence which are known to occur in pure C60 or in Me x C60 admixtured with alkali metals [2,9,10]. Therefore we could ascribe the following g-factor values: g+ .^.s 2.0025, g1-1.9998, g3-2.0014 to the C 6 0, CL and C ion radicals, respectively.…”

Discrete Fulleride Anions and Fullerenium Cations

“…104 They have also been used successfully in solution, typically in an ether (e.g., tetrahydrofuran, dimethoxyethane) [105][106][107][108][109] or liquid ammonia. 110,111 C 60 n-fullerides up to n ) 5 have been produced in this manner.…”

“…The variation with cation is substantial. Room-temperature line widths have been reported in the range 10-54 G. 133 These features have led Eaton et al to conclude that electron-spin relaxation rates are the main determinant of the line width variation, but the whole problem of line width variation is made complex by the presence of low-lying excited states, 179 motional effects, 106,220 and environmentally induced distortions. 346 A more quantitative understanding of the broad, temperature-dependent signal is coming from pulsed EPR measurements of the traverse and longitudinal relaxation times of C 60 -in a tetraphenylphosphonium salt.…”

Solid State Physicochemical Properties and Applications of Organic and Metallo- Organic Fullerene Derivatives

“…This in turn allows depositing organic films without resorting to the high vacuum deposition methods usually employed to deposit pristine fullerenes. For example, thin films of C 60 derivatives such as PCBM and other monoadducts [27,28] may be obtained by solution casting, self-assembly or Langmuir-Blodgett techniques [29,30,31]. Such films are better suited for application in electronic and photovoltaic devices.…”

“…Early studies on C 60 and C 70 electrodes to investigate their possible implementation in electrochemical cells showed however poor reversibility of lithium intercalation [224]. More recent studies on (poly)crystalline lithium fullerides have demonstrated the possibility of intercalating up to 28 Li atoms per C 60 molecules, with the formation of Li clusters in the interstitial sites [225]. Such high concentration is clearly not compatible with total ionization and charge transfer from lithium to the C 60 units, as these can accommodate only up to 6 electrons in their LUMO-derived level, so that partial covalency and hybridization of electronic levels have been suggested [226].…”