ISSN:
0749-1581
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The 195Pt NMR parameters of several phosphorus-platinum(O) complexes [LnPt(O), L = phosphine or phospite, n = 2, 3, 4] have been investigated to illustrate the particular NMR properties of a spin-1/2 heavy metal nucleus, and for elucidation of their dependence on the geometry of the complexes. In these compounds the T1 values vary as a function of the coordination number, n, over several orders of magnitude and, therefore, can be used as structure-dependent parameters. In L2Pt complexes the relaxation rate varies with Bo2, and chemical shift anisotropy (CSA) is the dominant relaxation mechanism. In the L3Pt and L4Pt complexes spin-rotation increasingly contributes to the relaxation. For the tirethylphosphine-platinum complex (L3) the contribution of CSA is reduced by 45% at 7 T and 240 K, whereas the tetrahedral trimethylphosphine-platinum (L4) and triethyl phosphite-platinum (L4) complexes relax mainly by spin-rotation even at 9.4 T.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260230715
