Addition of the pendant amine ligand PNRP (PNRP = Ph2PCH2NRCH2PPh2; R = Me, Ph, n-Bu) to Mn(CO)5Br gives fac-Mn(PNRP)(CO)3Br. Photolysis of fac-Mn(PNRP)(CO)3Br with dppm [dppm = 1,2-bis(diphenylphosphino)methane] provides mixed bis(diphosphine) complexes, trans-Mn(PNRP)(dppm)(CO)(Br). Reaction of trans-Mn(PN RP)(dppm)(CO)(Br) with LiAlH4 leads to trans-Mn(PN RP)(dppm)(CO)(H), which has been characterized by crystallography. Mn(P2PhN2Bn)(dppm)(CO)(H) [P 2PhN2Bn = 1,5-diphenyl-3,7-dibenzyl- 1,5-diaza-3,7-diphosphacyclooctane] can be prepared in a similar manner; its structure has one chelate ring in a chair conformation and the second in a boat conformation. The boat-conformer ring directs the nitrogen of the ring toward the carbonyl ligand, and the N⋯C distance between one N of the P 2PhN2Bn ligand and CO is 3.171(4) Å, indicating a weak interaction between the N of the pendant amine and the CO ligand. Reaction of NaBArF4 (ArF = 3,5-bis(trifluoromethyl)phenyl) with Mn(P-P)(dppm)(CO)(Br) produces the cations [Mn(P-P)(dppm)(CO)]+. The crystal structure of [Mn(PN MeP)(dppm)(CO)][BArF4] shows two very weak agostic interactions between C-H bonds on the phenyl ring and the Mn. The cationic complexes [Mn(P-P)(dppm)(CO)]+ react with H2 to form dihydrogen complexes [Mn(H2)(P-P)(dppm)(CO)]+ (K eq = 1-90 atm-1 in fluorobenzene, for a series of different P-P ligands). Similar equilibria with N2 produce [Mn(N 2)(P-P)(dppm)(CO)]+ (Keq generally 1-3.5 atm-1 in fluorobenzene).
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry