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The Reversible Formation of a Single-Bonded (C<sub>60</sub><sup>-</sup>)<sub>2</sub> Dimer in Ionic Charge Transfer Complex: Cp*<sub>2</sub>Cr·C<sub>60</sub>(C<sub>6</sub>H<sub>4</sub>Cl<sub>2</sub>)<sub>2</sub>. The Molecular Structure of (C<sub>60</sub><sup>-</sup>)<sub>2</sub>
90
Citations
7
References
2002
Year
Inorganic ChemistryMagnetic MomentEngineeringReversible FormationChemical BondX-ray DiffractionCoordination ComplexFullerenePhysical ChemistryMolecular ComplexChemistryMolecular ChemistrySupramolecular ChemistryNew Ionic ComplexCrystallographyBiophysicsIon Structure
A new ionic complex of C60 with decamethylchromocene, Cp*2Cr.C60(C6H4Cl2)2 (1), has been obtained. The fullerides are monomeric in 1 at room temperature, whereas they form a single-bonded (C60-)2 dimer at low temperatures, the structure of which has been studied by the X-ray diffraction on a single crystal at 100 K. The length of the intercage C-C bond is 1.597(7) A and the interfullerene distance is equal to 9.28 A. A phase transition attributed to the reversible C60*- dimerization is observed in the 220-200 K range. The transition is accompanied by changes in the unit cell parameters, the decrease of the magnetic moment from 4.20 muB (S = 3/2, 1/2) to 3.88 muB (S = 3/2) and the appearance of EPR signal from Cp*2Cr+, simultaneously.
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