6533b82efe1ef96bd12925e6

RESEARCH PRODUCT

Über gemischte bindungen in der IV. hauptgruppe

Martin DrägerStefan Adams

subject

biologyGeminalStereochemistryChemistryOrganic ChemistryNuclear magnetic resonance spectroscopyCrystal structurebiology.organism_classificationBiochemistryInorganic ChemistryBond lengthCrystallographyMolecular geometryMaterials ChemistryTetraMoleculePhysical and Theoretical ChemistryLinear correlation

description

Abstract Reaction of Ph3SnLi with Ph2SiCl2 or Ph2GeCl2 at −78°C in THF yields (Ph3Sn)2SiPh2 (1) and (Ph3Sn)2GePh2 (2). The crystal structure of 1 (R = 0.075) exhibits SnSi distances of 257.2(4) and 257.9(5) pm, an SnSiSn angle of 118.5(2)°, and a central C3SnSiC2SnC3 molecular skeleton with symmetry close to C2. The geminal NMR coupling 2J(119Sn ⋯ 119Sn) in 1, and in a tri-, tetra- and pentastannane series shows a linear correlation to their respective non-bonded d(Sn ⋯ Sn) distances (I(t-Bu2Sn)4I: 20 Hz/496 pm; 1: 724 Hz/443 pm).

https://doi.org/10.1016/0022-328x(87)87124-3