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- W2085755794 abstract "[η5-C5H2(SiMe3)3-1,2,4]K reacts with LaI3(THF)4 in tetrahydrofuran (THF) to form the mono-ring complex [η5-C5H2(SiMe3)3-1,2,4]LaI2(THF)x (1). Elemental analysis and 1H NMR spectroscopy indicate that the coordinated THF molecules are labile and are easily removed under vacuum. The THF adduct 1 is readily converted to the more stable pyridine complex [η5-C5H2(SiMe3)3-1,2,4]LaI2py3 (2) by the addition of excess pyridine to a toluene solution of 1. Although solid samples of 2 lose pyridine less readily, the pyridine molecules exchange with solvent molecules, and in the presence of a large excess of THF, 1 is re-formed. Complex 2 may be crystallized from toluene, and an X-ray diffraction study revealed a monomeric species with the two iodide ligands trans to each other, and three pyridines arranged in a meridional fashion. The addition of one equivalent of 2,2′-bipyridine to a toluene solution of 1 yields the bipyridine adduct, [η5-C5H2(SiMe3)3-1,2,4]LaI2(bipy) (3). In contrast to 1 and 2, the bipyridine molecule in 3 remains ligated to the lanthanum center in all solvents. Complex 3·py may be crystallized from THF–pyridine; in this case, the presence of bipyridine forces a cis orientation of the two iodide ligands. Copyright © 2003 John Wiley & Sons, Ltd." @default.
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- W2085755794 date "2003-01-01" @default.
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- W2085755794 title "Syntheses and structures of mono-cyclopentadienyl di-iodide complexes of the lanthanides: X-ray crystal structures of Cp?LaI2py3 (Cp? = [?5-C5H2(SiMe3)3-1,2,4]?; py = pyridine) and Cp?LaI2(bipy)py (bipy = 2, 2?-bipyridine)" @default.
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- W2085755794 doi "https://doi.org/10.1002/aoc.461" @default.
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