Electron paramagnetic resonance spectroscopic studies on the zero-valent rhodium complex [Rh(P(OPr i) 3) 4] at X-and Q-band frequencies
The EPR spectroscopic properties of the zero-valent rhodium complex [Rh(P(OPr i) 3) 4] have been examined at both X- and Q-band frequencies. The spectra show a large, essentially axial anisotropy and ligand hyperfine coupling to four equivalent 31P phosphorous nuclei. No resolved coupling to 103Rh was detected. The data indicate a tetragonally compressed tetrahedral structure (D 2d) rather than the alternative C 3v geometry provisionally proposed for the related [Co(P(OMe) 3) 4] complex.