Conformational analysis of coordination compounds. IX. ¹H N.M.R. study of diamagnetic complexes of (R)-1-Phenylethane-1,2-diamine

Abstract

The conformational analyses of the complexes [Co(CN)₄L]^-, [Co(NH₃)₄L]³⁺, [Mo(CO)₄L], and [PtL₂]²⁺, where L is (R)-1-phenylethane-1,2-diamine, have been carried out by a method based on the vicinal proton coupling constants of the CHCH₂ fragment. In the three octahedral complexes, the phenyl showed a similar preference for the equatorial orientation with n_λ values of 0.87±0.05, 0.84±0.11, and 0.77±0.01, respectively. For the bis(diamine)platinum(II) complex, the λλ and δλ configurations were found to be equally populated, with the δδ configuration 3.4 kJ mol^-1 less favoured.