980.
The products of the reaction of [RhCl (NBD)]
2 (NBD = norbornadiene), with four equivalents tertiary phosphine and two equivalents of tin (II) bromide have been studied by
119Sn- and
31P-NMR. spectroscopy. The solution data suggest that halogen scrambling occurs during the preparation and results in a mixture of complexes containing SnBr
3, SnClBr
2, and SnCl
2Br and SnCl
3 ligands, and this is confirmed by independent synthesis of the SnCl
3 and SnBr
3 complexes. The metalmetal coupling constants,
1J (
119Sn,
103Rh), vary from 452 to 580 Hz and are linearly related to: (a) δ(
119Sn) in the complexes [Rh (SnCl
nBr
(3-n))NBD (PEtPh
2)
2] and (b) the sum of the
Pauling electronegativities for the halogens on tin.
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