Beryllocene: a microwave dielectric loss study

Abstract

Microwave dielectric loss measurements at 1.141, 3.031, and 8.543 GHz are reported for beryllocene [bis(cyclopentadienyl)beryllium] in cyclohexane, decalin, benzene, and 1,4-dioxane solutions. The dipolar nature of beryllocene is confirmed. Anomalously large atomic polarization is found. The dielectric absorption is interpreted to suggest rocking movements of the cyclopentadienyl groups synchronous with oscillation of the beryllium atom between two equivalent positions in an η⁵,σ structure. Evidence is presented for interaction with solvating benzene and 1,4-dioxane molecules.