Abstract
Abstract The ligands RN(CH2-2-C5H4N)2, L1, R = CH2C6H4-2-OH; L2, R = CH2C6H3-4-Me-2-OH; L3, R = CH2C6H3-5-Cl-2-OH; L4, R = CH2C6H3-5-NO2-2-OH; give dimethylplatinum(II) complexes that activate dioxygen in the absence of a protic solvent. The initial reaction with [Pt2Me4(SMe2)2] gives [PtMe2(κ2-N,N’-L)], and these react with oxygen to give [Pt(OH)Me2(κ3-N,N’,N”-L-H)], which exist as a mixture of isomers. The factors influencing reactivity and mechanism in these reactions are elucidated, and the presence of both a free pyridyl donor (push group) and a free hydroxyl (pull group) is suggested to give a synergy for dioxygen activation. Some platinum(II) complexes and trimethylplatinum(IV) complexes with these ligands are also reported.
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