Cationic rhodium(III) bisdimethylglyoximates with water and triphenylphosphine axial ligands
摘要:
Preparations of [Rh(Hdmg)(2)(H2O)(2)]ClO4 (1) (Hdmg=dimethylgyoximate) from [Rh(H2O)(6)](ClO4)(3) and dimethylglyoxime and of [Rh(Hdmg)(2)(PPh3)(2)]ClO4 (2) from 1 and PPh3 are described. 1 crystallizes in the C2/c space group with a=14.910(3), b=6.058(1), c=18.617(4) Angstrom, beta=107.649(8)degrees Z=4. The structure was refined up to R=0.021 for 1849 reflections. The IR and NMR spectra and electrochemical behavior of 1 and 2 are discussed and compared with other rhodoximes. Three polarographic and CV processes can be detected for 2, the first two, respectively to Rh(Il) and Rh(I), being followed by fast reactions.