Structure of Hexatitanooctadecatungstodigermanate

Abstract

The structure of a dimeric Keggin-typed polyoxotungstate, [Ge₂Ti₆W₁₈O₇₇]¹⁴⁻, was investigated by X-ray diffractometry and ¹⁸³W NMR spectroscopy. K₉H₅[Ge₂Ti₆W₁₈O₇₇]·16H₂O crystallizes in triclinic a = 17.582(4), b = 22.139(5), c = 12.960(2) Å, α = 101.26(2), β = 94.07(2), γ = 109.20(2)°, V = 4622(4) ų. The D_3d [Ge₂Ti₆W₁₈O₇₇]¹⁴⁻ anion, which gives two ¹⁸³W NMR resonances at −107.45 and −127.76 ppm, consists of two C_3v α-A-[GeTi₃W₉O₄₀]¹⁰⁻ moieties fused together at the terminal O atoms of the 6 Ti atoms.