Clustering and polymerization of Li15C60

Electrochemical synthesis of lithium fullerides

“…One can observe three distinct reduction steps: a -formation of Li 4 C 60 at ~1 V vs. Li; b -Li 10 C 60 is formed at 0.75 V vs. Li and c -finally, the structure accommodates additional Li up to approximately 16 atoms per C 60 . This is in good agreement with the compositions obtained by a chemical method [8]. Fig.…”

“…However, it was found that such metalreach fullerides can be formed only with smaller (Li) atoms. Moreover, in the case of Li, further doping is possible, resulting in the formation of a product of composition Li 15 C 60 with fcc packing of the fullerene ions [8]. The aim of this paper was to study the possibility of preparation of such Li-rich fullerides by the electrochemical method.…”

spin counting

“…These techniques, initially developed for 1 H NMR, were later modified for application to 13 C NMR [19,26], creating multiple-pulse sequences which take into account the chemical shift anisotropies which are much larger for 13 C than are the dipolar interactions. Whilst these methods are restricted to multiple-quantum filters on spins IZ1/2, there are also techniques which have been developed for application to quadrupolar nuclei, specifically the IZ3/2 7 Li nucleus, under static conditions [15,27], for use in spin counting experiments. These made use of a magic echo, with a spin lock being applied during excitation (rotatingframe defocusing) followed by an echo sequence during detection (laboratory-frame refocusing).…”

“…Consideration of this third factor alone has led to a method for interpreting spin counting results by fitting the signal intensities from the different coherence orders to statistical models. Although doubt has been cast on the validity of these models [44,45], their wide use [2,9,15,27,33,[46][47][48][49][50][51][52][53][54][55][56][57][58][59][60] necessitates a discussion in this review.…”

“…Spin counting has not been restricted to spin IZ1/2 nuclei. The spin IZ3/2 7 Li nucleus has also been the focus of spin counting studies [15,27], with clusters of lithium in Li x C 60 being studied. In addition to using a distinct method for multiple-quantum filtration to those used for spin IZ1/2 (see Section 3.5), these studies also need a different method for analysing their results, since the coherence order in such systems is limited not to GN, where N is the number of spins, but to G3N.…”