Observation of triple-quantum effects in the HMQC spectra of substituted derivatives of Rh6(CO)16†

Abstract

Triple-rhodium quantum effects in the HMQC spectra of [Rh₆(C0)₁₅L][L = MeCN, I, PBuⁿ₃, P(0Ph)₃, P(4-XC₆H₄)₃; X = H. 0Me, F] modulate the intensity and position of the correlations in the rhodium dimension; cross peaks are displaced from the true chemical shift, additional cross peaks are seen, and the intensity of the coherences varies as a function of the mixing time and coupling constant, going to zero at the conventional valueof 1/(2J).