
TY  - JOUR
A1  - Colton, R 
A1  - Dakternieks, D 
T1  - Phosphorus-31 and Mercury-199 N.M.R. studies on mercury(II) halidetributylphosphine complexes
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1980
VL  - 33
IS  - 5
SP  - 955
EP  - 963
KW  - 
UR  - https://doi.org/10.1071/CH9800955 
N2  - Phosphorus-31 and mercury-199 N.M.R. studies have been carried out on HgX2P2,Hg2X4P2, mixtures thereof and the oligomers Hg2X4P3, Hg3X6P2 and Hg4X8P2 where X = Cl, Br, I and P = tributyl-phosphine. The results are consistent with exchange of both phosphine and halogen. The phosphine exchanges slowly on the N.M.R. time scale at room temperature, but rapidly on the preparative time scale. Halogen exchange is fast on both the N.M.R. and preparative time scales at room temperature; cooling to -120&#176;C reduces exchange of terminal halogens to a slow rate on the n.m.r. time scale. Increase in the coupling constant JP,Hg at low temperature is attributed to the slowing down of halogen exchange. Exchange of bridging halogens is still fast at -120&#176;C.      Mercury-199 chemical shifts span a range of over 3000 ppm and shifts have been correlated with 31P chemical shifts and with the coupling constants JP,Hg The 199Hg n.m.r. data confirm the existence of an asymmetrical isomer of Hg2I4(PBu3)2. 
ER  -

