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2004
Germanium
I 4700
49- 016
K2[Ge(B4O9)]·2H2O: A Unique 3D Alternating Linkage Mode of a B4O9 Cluster
and GeO4 Unit in Borogermanate with Two Pairs of Interweaving Double Helical
Channels. — Single crystals of the title compound, the first noncentrosymmetric potassium templated borogermanate, are prepared solvothermally from a mixture of
K2B4O5(OH) 4, GeO2, and diethylenetriamine in Py/H2O (pH 8.5, autoclave, 170 °C,
7 d; 78% yield). K2[Ge(B4O9)]·2H2O crystallizes in the monoclinic space group Cc with
Z = 4. Interestingly, the structure possesses a unique three-dimensional alternating linkage mode of B4O9 clusters and GeO4 units and contains two pairs of interweaving double helical channels with a 10-membered ring. In one, the right- and left-handed helices
couple each other, and in the other, the left- and right-handed helices couple together.
The compound exhibits distinct nonlinear optical (NLO) properties because it lacks a
symmetric center. — (ZHANG, H.-X.; ZHANG, J.; ZHENG, S.-T.; WANG, G.-M.;
YANG*, G.-Y.; Inorg. Chem. 43 (2004) 20, 6148-6150; State Key Lab. Struct. Chem.,
Fujian Inst. Res. Struct. Matter, Chin. Acad. Sci., Fujian, Fuzhou 350002, Peop. Rep.
China; Eng.) — Schramke
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