Synthesis and NMR structural studies of allyl(polypyrazolylborate)palladium and platinum complexes
作者： Kenzo Ohkita , Hideo Kurosawa , Takeya Hasegawa , Tomohide Shirafuji , Isao Ikeda
DOI: 10.1016/S0020-1693(00)92370-3
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摘要: Abstract Mono- and binuclear palladium platinum complexes containing the tetrakis(pyrazolyl)borate ligand were prepared. The solution structure dynamic properties of these investigated with NMR techniques. In mononuclear triphenylphosphine complexes, PtX(PPh3)(BPz4), activation energy for inversion boat-like B(NN)2Pt ring decreased in order, XI > Cl Br> η1-methallyl, as a result combined effects exerted by electronic steric requirements. Complexes M(η3-methallyl)(BPz4) (MPd, Pt) accepted metal ions (Ag+, [(η3-methallyl)M]+) to give complexes. 1D 2D NOE spectra complex [(η3-methallyl)Pt(BPz4)Pt(η3-methallyl)]BF4 suggested occurrence fast intramolecular interconversion between some conformational isomers arising from Pt(NN)2B inversion.
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