188638-36-0Relevant articles and documents
Platinum(II)- and palladium(II)-amide complexes [M{NC(O)CH2CH2}2L2] derived from 2-azetidinone (β-propiolactam); a synthetic, electrospray mass spectrometric and X-ray crystallographic study
Henderson, William,Sabat, Michal
, p. 1662 - 1678 (2008/10/09)
A number of platinum(II) and palladium(II) complexes 3 and 4 containing amido ligands derived from β-propiolactam (2-azetidinone, Haz) havebeen synthesized in high yield by the silver(I) oxide-mediated reaction s of the complexes cis-[MCl2L2] [M = Pt, L = cycloocta-1,5-diene (COD) or PPh3; M = Pd, L = 2,2'-bipyridine (BIPY) or 1,10-phenanthroline (PHEN)with 2-azetidinone. Displacement of the COD ligand allowed the synthesi s of a number of other derivatives containing phosphine, phosphite and isocyanide ligands. Electrospray mass spectrometry has also been used to further characterize these complexes, to probe the strength of binding of the amide ligands and to investigate the ability of the complexes to act as metallo-ligands towards other mono-, di- and trivalent cations. A detailed study on the bis(triphenylphosphine)platinum complex 3b shows that fragmentation, induced by higher cone voltages, proceeds initially via loss of a deprotonated azetidinone monoanion (az(-)) ligand, yielding[Pt(az)(PPh3)2](+). Upon further increasing the cone voltage, cyclometa llation of one of the triphenylphosphine ligands occurs. Complex 3b readily forms adducts with a range of alkali-metal cations, Ag(+), divalent cations (Ba(2+), Cu(2+), Zn(2+) and Pb(2+)) and a trivalent cation (Pr(3+)). Complex 3b shows selectivity for Na(+) ions over other alkali-metalcations in forming a dipositively charged aggregate of the type [2M*2Na ](2+) at low cone voltages. The X-ray structure of complex 3b is also reported.
