UEBER GEMISCHTE BINDUNGEN IN DER IV. HAUPTGRUPPE. III. OCTAPHENYLPROPAN-ANALOGA Ph3SnSiPh2SnPh3 UND Ph3SnGePh2SnPh3, KORRELATION ZWISCHEN GEMINALEN NMR-KOPPLUNGEN 2J(Sn-M-Sn) UND NICHT-BINDENDEN Sn...Sn-ABSTAENDEN

Article abstract of DOI:10.1016/0022-328X(87)87124-3

Reaction of Ph3SnLi with Ph2SiCl2 or Ph2GeCl2 at -78 deg 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) deg, and a central C3Sn-SiC2-SnC3 molecular skeleton with symmetry close to C2.The geminal NMR coupling ²J(119 Sn...119 Sn) 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).