The 31P{1H} NMR spectrum of a CDC13 solution of the square planar rhodium(I) complex 3.12...

The 31P{1H} NMR spectrum of a CDC13 solution of the square planar rhodium(I) complex 3.12 exhibits a doublet of doublets (J 38 Hz, 145 Hz) and a doublet of triplets (J 38 Hz, 190 Hz). Rationalize these data. [Hint: look at Table]

The structure of the [(PCMe3)3Me]+ cation in the salt [(PCMe3)3Me][CF3S03] determined by X-ray diffraction [N. Burford et al. (2005) Angew. Chem. Int. Ed., vol. 44, p. 6196]. Colour code: P, orange; C, grey; H, white.