René Zimmer

Niedermolekulare diorganozinn-sauerstoff-verbindungen: di-t-butyl- und di-t-amylzinnoxid

Abstract Di-t-butyltin oxide (t-Bu2SnO)3 and di-t-amyltin oxide (t-Am2SnO)3 were synthesized by hydrolysis of the diorganotin dichlorides. Their molecular and crystal structures were investigated by X-ray diffraction techniques and vibrational spectroscopy. Both compounds form isolated molecules with planar six-membered tin-oxygen rings.

Röntgenographische und spektroskopische untersuchungen an di-t-butylzinn—chalkogen-vierringverbindungen

Abstract Di-t-butyltin chalcogenides (t-Bu2SnY)2 (Y  S, Se, Te) have been synthesized and have been characterized by X-ray crystallography and NMR spectroscopy. All compounds form planar four-membered tin-chalcogen rings but show different crystal packings. A correlation of the chemical shifts δ(119Sn) with the electronegativities of the chalcogenes is given.

Darstellung und strukturen von cyclischen tristanna-dichalkogen-verbindungen

Abstract Cyclic tin chalcogen compounds with tintin bonds (t-Bu 2 Sn) 3 Y 2 (Y  S, Se, Te) have been prepared starting with (t-Bu 2 Sn) 4 or (t-Bu 2 SnY) 2 . X-Ray analysis shows planar five-membered tin-sulfur rings and tin-selenium rings. The structure of the tellurium compound consists of puckered molecules with C 2 symmetry and a somewhat shorter tintin bond.

Darstellung und strukturen von cyclischen octa-t-butyl-tetrastanna-chalkogen-verbindungen

Abstract New cyclic compounds t-Bu8Sn4Y (Y =S, Se, Te) have been synthesized by reaction of I(t-Bu2Sn)4I with the corresponding hydrogen chalcogenides. The tin-chalcogen five-membered rings are almost planar and the tin-tin bonds are noticeably longer than in the organotin compounds studied until now.

Spiroverknüpfte diorganylzinn-chalkogenide mit unterschiedlicher konformation

Abstract The non-planarity of the Sn 3 Y 3 rings in octaorganylspirobis(cyclotristan-nachalcogenans) leads to an interesting conformational isomerism of these compounds. X-ray structure analysis shows taht the t-butyl-substituted spirobis-(cyclotristannathian) has molecular symmetry D 2 , whereas the isopropyl-substituted compound adopts S 4 -conformation. Octaisopropylspirobis(cyclotristannaselenan) crystallizes isotypically to the sulphur compound. As 13 C and 119 Sn NMR spectra indicate, there is an equilibrium between the two forms in solution.