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- W2317562258 abstract "The salt (DMI+)2·(C60•–)·{Cd(Et2NCS2)2I–} (1) containing fullerene radical anions, the anions of cadmium diethyldithiocarbamate iodide, and N,N′-dimethylimidazolium cations was obtained. Fullerenes are monomeric in 1 at 250 K and form three-dimensional packing in which each fullerene has nearly tetrahedral surroundings from neighboring fullerenes. Fullerenes with a shorter interfullerene center-to-center distance of 10.031(2) Å form spiral chains arranged along the lattice c axis. The convolution consists of four fullerene molecules. Dimerization realized in 1 within the spiral chains below 135 K manifests a strong dependence on the cooling rate. The “frozen” monomeric phase was obtained upon instant quenching of 1. This phase is stable below 95 K for a long time but slowly converted to the dimeric phase at T > 95 K. It exhibits a weak antiferromagnetic interaction of spins below 95 K (the Weiss temperature is −4 K), which results in the splitting of the electron paramagnetic resonance (EPR) signal into two components below 10 K. A disordered phase containing both C60•– monomers and singly bonded (C60–)2 dimers with approximately 0.5/0.5 occupancies is formed at an intermediate cooling rate (for 20 min). The position of each fullerene in this phase is split into three positions slightly shifted relative to each other. The central position corresponds to nonbonded fullerenes with interfullerene center-to-center distances of 9.94–10.00 Å. Two other positions are coincided to dimeric fullerenes formed with the right and left fullerene neighbors within the spiral chain. This intermediate phase is paramagnetic with nearly zero Weiss temperature due to isolation of C60•– by diamagnetic species and exhibits a strongly asymmetric EPR signal below 20 K. A diamagnetic phase containing ordered singly bonded (C60–)2 dimers can be obtained only upon slow cooling of the crystal for 6 h." @default.
- W2317562258 created "2016-06-24" @default.
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- W2317562258 date "2012-02-29" @default.
- W2317562258 modified "2023-09-25" @default.
- W2317562258 title "Effect of the Cooling Rate on Dimerization of C<sub>60</sub><sup>•–</sup> in Fullerene Salt (DMI<sup>+</sup>)<sub>2</sub>·(C<sub>60</sub><sup>•–</sup>)·{Cd(Et<sub>2</sub>NCS<sub>2</sub>)<sub>2</sub>I<sup>–</sup>}" @default.
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- W2317562258 doi "https://doi.org/10.1021/ic201732t" @default.
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