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Isotope effects on 31 P nuclear shielding in thiophosphites
Author(s) -
Démarcq Michel C.,
Le Gleut Louis,
Van Hemelryck Bruno G.
Publication year - 1991
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260290307
Subject(s) - chemistry , isotope , kinetic isotope effect , sulfur , shielding effect , radiochemistry , electromagnetic shielding , deuterium , atomic physics , organic chemistry , nuclear physics , physics , layer (electronics) , electrical engineering , engineering
The 34 S isotope effect on the chemical shift of P III nuclei in P(SR) 3 esters [R = Et, (C 12 H 25 ) n , Ph] is close to 20.6 ppb per P III 34 S bond, i.e. 3–4 times larger than for thiolo sulphur atoms in S = P(SR) 3 or O = P(SR) 3 . A similar behaviour is noted for the P(S) 3 sites in P 4 S 9 and P 4 S 3 and for the downfield triplet of P 4 S 8 , which, accordingly, is assigned to the tri‐coordinate P atoms of this sulphide. 13 C isotope effects are also reported for trialkyl(aryl) phosphorotrithioites and S , S , S ‐phosphorotrithioates.
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