Abstract
Abstract New{poly(1-pyrazolyl)borato}palladium(II) complexes, [Pd{CH=CCl–CMe2(NMe2)–1-C,N}(BPz4)] (Pz=1-pyrazolyl) 1, [Pd{CH2CMe(OMe)–CH2S–t-Bu–1-C,S}(BPz3Y)] (Y=Pz or H), and [Pd{CH2CMe(OMe)–CH2NMe2–1-C,N}(BPz3Y)] were prepared and characterized by means of elemental analysis and IR and 1H-NMR spectroscopy. The stereochemical nonrigidity of these complexes was discussed on the basis of 1H-NMR data. The fluxional behavior of the BPz4 ligand in 1 was analyzed in detail by means of an approximate method based on the Bloch equation, and found to consist of three kinds of motions: inversion of the Pd—(N–N)2–B boat-type six-membered ring, rotation of the BPz4 ligand about the Pd-pyrazolyl nitrogen bond accompanying the inversion, and a tumbling process.
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