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[SbCl3(C9H11N3S2)2], monoclinic, P21/n (no. 14), a = 13.8069(4) Å, b = 13.5739(6) Å, c = 14.0182(5) Å, β = 94.231(3)°, V = 2,620.04(17) Å3, Z = 4, Rgt(F) = 0.0329, wRref(F2) = 0.0726, T = 153 K.

[C3H10N][C12H24BO4]·B(OH)3, orthorhombic, Fdd2 (no. 43), a = 30.3986(6) Å, b = 40.4094(13) Å, c = 7.0603(2) Å, V = 8672.8(4) Å3, Z = 16, R gt(F) = 0.0324, wR ref(F 2) = 0.0828, T = 153 K.

C23H19NO3Si, monoclinic, P21/n (no. 14), a = 8.5543(3) Å, b = 24.0927(8) Å, c = 9.7971(4) Å, β = 113.265(3)°, V = 1854.96(12) Å3, Z = 4, Rgt (F) = 0.0355, wRref (F 2) = 0.0932, T = 153 K.

Triethylammonium dichloro[N-[(2-oxyphenyl)methylidene]valinato]-phenyl-tin(iv) was prepared and characterized by spectroscopic methods and single crystal X-ray crystallography. The compound consists of a triethylammonium cation and a tin complex as anion. The tin complex is composed of a tridentate O,N,O-Schiff base ligand coordinated to a SnCl2Ph unit. The tin atom is in distorted octahedral coordination geometry. NMR spectroscopic studies have shown that the unusual hexa-coordinated tin complex was formed as a kinetically controlled product. Storage of the solid product for several years led to a transformation into a thermodynamically stable penta-coordinated tin complex.

C29H25NO4Si·CHCl3, monoclinic, P21/c (no. 14), a = 17.1316(8) Å, b = 10.1173(3) Å, c = 18.2252(8) Å, β = 117.195(3)° $117.195(3){}^{\circ}$ , V = 2809.7(2) Å3, Z = 4, R gt(F) = 0.0431, wR ref(F 2) = 0.1050, T = 153 K.

C16H14Cl3NO3Sn·CH2Cl2, monoclinic, P21/n (no. 14), a = 11.1341(4) Å, b = 10.5867(2) Å, c = 18.6979(6) Å, β = 93.126(3)°, V = 2200.7(1) Å3, Z = 4, Rgt(F) = 0.0405, wRref(F2) = 0.0847, T = 213 K.

C10H20BNO3, monoclinic, P21/c (no. 14), a = 11.0681(8) Å, b = 6.1883(3) Å, c = 18.1603(13) Å, β = 105.111(6)°, V = 1200.84(14) Å3, Z = 4, R gt(F) = 0.0338, wR ref(F 2) = 0.0861, T = 153 K.

The syntheses of three different amidinosilanes of the type Me2Si[N=C(Ph)R]2 with R = pyrrolidino, morpholino, and diethylamino and one derivative with the composition R2Si[N=C(Ph)R]2 with R = morpholino are reported. These compounds were prepared in one-pot syntheses including three consecutive steps. All products are analysed by single crystal X-ray diffraction, NMR, and Raman spectroscopy. The Si–N=C–N units of these compounds show characteristic structural features and cause a significant high field shift of the 29Si NMR signals.

New cyclic and spirocyclic aminosilanes were synthesised using ethylenediamine, 2-aminobenzylamine, 1,8-diaminonaphthalene, o-phenylenediamine, and trans-cyclohexane-1,2-diamine as starting material. These diamines were converted into aminosilanes using silicon tetrachloride and dimethyldichlorosilane directly and via the N,N’-bis(trimethylsilylated) amino derivatives. 15 new compounds of the type (diamino)(SiMe3)2, (diamino)2Si, (diamino)SiMe2, and (diamino)SiCl2 have been prepared. The formation of two cyclotrisilazane derivatives was observed starting from (N,N’-2-aminobenzylamino)dichlorosilane by trimerisation. All synthesised compounds have been characterised with NMR-, Raman-, or IR-spectroscopy, mass-spectrometry, and boiling or melting point. Single-crystal X-ray structure analyses of several derivatives have been performed.

Substances like 3-aminopropyltriethoxysilane are often used as adhesive promoters in various formulations for coatings or to adjust the properties of siloxanes and other polymers. Cyclisation of similar substances is also interesting because of the formation of the Si-N bond. 1-Aza-2-silacyclopentanes were synthesised from 3-aminopropylalkoxysilanes by intramolecular condensation reactions and substitution reactions at the silicon atom. The products tend to undergo ring-opening polymerisation. In contrast to literature reports, they can only be isolated as N-substituted derivatives. Phenylisocyanate inserts into the Si-N bonds of cyclic aminosilanes to form seven-membered heterocycles. Furthermore, phenylisocyanate reacts with N-H bonds in the same molecule. Two insertion products were isolated, and their crystal structures were determined.