A. I. Gusev

Crystal and molecular structure of the complex of germanium dibromide with 1,4-dioxane

The ability of divalent germanium halides to form complexes with various organic !igands has been known for a long time [i], but the structures of such compounds have been investigated little. There are published data on the structure of the complexes of dich!orogermane with 1,4-dioxane [2] and of bis[(trimethylsilyl)methyl]germane with chromium hexacarbonyl [3]. Both researches were conducted in the seventies, and since that time there have been no new data on this interesting direction in structural chemistry. In the meantime reports have recently appeared on the effective utilization of the complex of germanium dibromide with 1,4-dioxane for the production of various carbofunctional derivatives of germanium, including such difficultly obtainable compounds as bromomethyland adamantylgermanes [4]. For the further development of this direction in the preparative chemistry of germanium it is desirable to obtain data on the molecular structure of the complex. On the basis of this consideration and also the need to extend the data on the structure of the complexes of germanium dihaiides we undertook the present investigation~

Crystal and molecular structure of (2,6-dimethoxyphenyl)-trichlorostannane

In addition to the chlorine and C(1) atoms, which are attached to the tin atom by covalent bonds, the O(i) and 0(2) atoms of the methoxy groups are situated at distances considerably less than the sums of the van der Waals radii of tin and oxygen (3.5 ~ [5]). The difference of 0.35 ~ in the Sn...O bond lengths [Sn-O(1) 3.20, Sn-O(2) 2.85 ~] is apparently due to the screened orientation of the plane of the benzene ring and the Sn-CI(2) bond. The Sn-C(1)-C(4) angle is 173.1 ~ The orientation of the trichlorostannyl group relative to the aromatic ring is such that CI(2) is close to the plane of the aromatic ring, its departure from this plane being 0.29 ~, and the torsion angles Cl(2)-Sn-C(1)C(2 ) and CI(2)_Sn-C(1)C(6) are ii.0 and 8.5 ~ , respectively. The repulsion betweenCl(2) and 0(I) [theCl(2)...0(1)