Abstract
The 9Be quadrupole coupling constants, eQq/h, in 2.15 mol kg−1 [Be(acac)2]–CD3CN (acac− = pentane-2,4-dionate ion) at eight temperatures between 240 and 309 K were determined by the dual spin probe technique. The value of eQq/h was 348 kHz independent of temperature. By using the eQq/h value, the rotational correlation time of the complex in CH3CN at infinite dilution, τr∞, was evaluated from the 9Be relaxation rate measured in 12.7 mmol kg−1 [Be(acac)2]–CH3CN. The τr∞ thus obtained was proportional to η0/T, where η0 is the viscosity of the solvent at temperature T. The proportional constant was compared with that of [Co(acac)3] in CH3CN, which was determined elsewhere. We deduce that [Be(acac)2] interacts with acetonitrile molecules more weakly than [Co(acac)3].
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