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首页> 外文期刊>Polyhedron: The International Journal for Inorganic and Organometallic Chemistry >Tertiary phosphine oxide complexes of lanthanide diiodides and dibromides
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Tertiary phosphine oxide complexes of lanthanide diiodides and dibromides

机译:镧系元素二碘化物和二溴化物的叔膦氧化物复合物

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The reaction of OPR3 (R = Me, Ph) with YbI2, EuI2 and EuBr2 in rigorously anhydrous MeCN under N-2 produces the divalent lanthanide complexes [LnX(2)(OPR3)(4)] (Ln = Yb, Eu, X = I; Ln = Eu, X = Br) in moderate to good yield, whilst [SmI2(OPR3)(4)] were obtained from SmI2 and OPR3 in dry, degassed thf. These are the first examples involving divalent lanthanide ions and the complexes have been characterised by micro-analysis, IR, UV-Vis and P-31{H-1} NMR spectroscopy. The X-ray crystal structure of [EuI2(OPPh3)(4)]center dot MeCN confirmed the six-coordinate Eu(II) species with a cis-octahedral geometry, which IR spectroscopy suggests is present in all of the OPPh3 complexes. In contrast the [LnX(2)(OPMe3)(4)] complexes appear to be trans isomers. The OPPh3 complexes are readily oxidised by dry O-2 or I-2, yielding the corresponding trivalent cations, [LnX(2)(OPPh3)(4)](+); a crystal structure of the product formed by oxidation of [EuI2(OPPh3)(4)] in MeCN solution confirms this to be [EuI2(OPPh3)(4)]I-3 center dot 1.5MeCN, containing a trans-octahedral cation. (C) 2018 The Author(s). Published by Elsevier Ltd.
机译:在N-2下,用YBI2,EUI2和EUBR2的OPR3(R = ME,pH)的反应产生二价镧系元素[LNX(2)(OPR3)(4)](LN = YB,EU,X. = I; Ln = Eu,x = Br)以中等至良好的产量,而在干燥的SMI2和OPR3中获得[SMI2(OPR3)(4)],干燥,脱气的THF。这些是涉及二价镧系元素离子的第一个实例,并且该配合物的特征在于微观分析,IR,UV-Vis和P-31 {H-1} NMR光谱。 [EUI2(OPPH3)(4)]中心点Mecn的X射线晶体结构证实了具有顺式八面体几何形状的六坐标EU(II)物种,其中IR光谱表明存在于所有OPPH3复合物中。相反,[LNX(2)(OPME3)(4)]复合物似乎是反式异构体。 OPPH3复合物通过干O-2或I-2容易地氧化,得到相应的三价阳离子,[LNX(2)(OPPH3)(4)](+);在Mecn溶液中氧化通过氧化形成的产物的晶体结构证实含有含有反式八面体阳离子的[EUI2(OPPH3)(4)] I-3中心点1.5MYCN。 (c)2018年作者。 elsevier有限公司出版

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