The crystal structure of the trimethylsilyl derivative of the seven-membered ring silicate anion – [(CH3)3Si]14[Si7O21]

Yu. I. Smolin, Yu. F. Shepelev, A. S. Ershov and D. Hoebbel


The structure of trimethylsilyl cyclohepta silicic acid ester has been determined by direct methods. [(CH3)3Si]14[Si7O21] is monoclinic, B2/b, with a = 26.81(1) Å, b = 22.37(1) Å, c = 16.48(1) Å, γ = 94.96(5)°, V = 9847 Å3, dcalc = 1.048 g/cm, Z = 4. The structure refinement with 1506 independent reflections having Fo2 > 3σ(Fo2) led to R = 0.057 (anisotropic, without hydrogen atoms). The central part of the ester molecule is a single seven-membered ring formed by silicon-oxygen tetrahedra, Every tetrahedron is connected with two neighbouring tetrahedra by common oxygen atoms.

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Zeitschrift für Kristallographie – Crystalline Materials offers a place for researchers to present results of their crystallographic studies. The journal includes theoretical as well as experimental research. It publishes Original Papers, Letters and Review Articles in manifold areas of crystallography.