NMR detection of thermal and photochemical dihydrogen addition products of mono- and tri-nuclear ruthenium complexes containing carbonyl and triphenylphosphine ligands through para-hydrogen induced polarisation
Abstract
Enhancement of NMR signals by para-hydrogen induced polarisation is shown to facilitate the detection of isomers of Ru(CO)2(H)2(PPh3)2 and Ru(CO)3(H)2(PPh3) which contain inequivalent hydride ligands, and to demonstrate that Ru3(CO)9(PPh3)3 adds H2 to form Ru3(CO)8(H)(µ-H)(PPh3)3, as well as undergoing fragmentation to form Ru(CO)3(H)2(PPh3).