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119 Sn‐ and 31 P‐NMR. Spectroscopy of the 5‐coordinate complexes [Rh (SnCl n Br (3−n) ) (norbornadiene) (tertiary phosphine) 2 ]
Author(s) -
Garrlda Maria,
Garcia Victoria,
Kretschmer Matthias,
Pregosin Paul S.,
Ruegger Heinz
Publication year - 1981
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19810640421
Subject(s) - chemistry , phosphine , norbornadiene , halogen , tin , nuclear magnetic resonance spectroscopy , bromide , spectroscopy , medicinal chemistry , electronegativity , stereochemistry , crystallography , inorganic chemistry , organic chemistry , catalysis , alkyl , physics , quantum mechanics
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 119 Sn‐ and 31 P‐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 2 Br and SnCl 3 ligands, and this is confirmed by independent synthesis of the SnCl 3 and SnBr 3 complexes. The metalmetal coupling constants, 1 J ( 119 Sn, 103 Rh), vary from 452 to 580 Hz and are linearly related to: (a) δ( 119 Sn) in the complexes [Rh (SnCl n Br (3‐n) )NBD (PEtPh 2 ) 2 ] and (b) the sum of the Pauling electronegativities for the halogens on tin.