Synthesis and reactions of the cyclooctadienylmolybdenum complexes [MoBr(CO)2(NCMe)2(η3-C8H11)] (η3-C8H11 = 1–3-η:4,5-C8H11 or 1–3-η:5,6-C8H11)
作者:Dale M. Spencer、Roy L. Beddoes、Rasika K. Dissanayake、Madeleine Helliwell、Mark W. Whiteley
DOI:10.1039/b107581k
日期:2002.3.8
The first examples of cyclooctadienylmolybdenum complexes, [MoBr(CO)2(NCMe)2(1â3-η:5,6-C8H11)] and [MoBr(CO)2(NCMe)2(1â3-η:4,5-C8H11)], accessible by reaction of [Mo(CO)3(NCMe)3] with bromocyclooctadienes, are precursors to [MoBr(CO)2(L2)(η3-C8H11)] [L2
= 2,2â²-bipyridine; Ph2P(CH2)nPPh2 (n
= 1 or 2); 2CNBut]; [Mo(CO)2(η3-C8H11)Cp], and [Mo(CO)2(L3)(η3-C8H11)]+ (L3
= NCMe or CNBut). The X-ray crystal structures of [MoBr(CO)2(L2)(1â3-η:5,6-C8H11)] (L2
= 2,2â²-bipyridine
or Ph2PCH2CH2PPh2) and [Mo(CO)2(CNBut)3(1â3-η:4,5-C8H11)][BF4] have been determined and the solid state conformations of the two types of trihapto-bonded cyclooctadienyl ring investigated. The characteristic 1H and 13C1H} NMR spectral features of the 1â3-η:5,6-C8H11 and 1â3-η:4,5-C8H11 ligands are defined.
通过[Mo(CO)3(NCMe)3]与溴环辛二烯反应可获得的[MoBr(CO)2(L2)(δ-3-C8H11)][L2 = 2,2â²-联吡啶;Ph2P(CH2)nPPh2(n = 1 或 2);2CNBut];[Mo(CO)2(δ-3-C8H11)Cp]和[Mo(CO)2(L3)(δ-3-C8H11)]+(L3 = NCMe 或 CNBut)。测定了[MoBr(CO)2(L2)(1â3-δ-:5,6-C8H11)](L2 = 2,2â²-联吡啶或 Ph2PCH2CH2PPh2)和[Mo(CO)2(CNBut)3(1â3-δ-:4,5-C8H11)][BF4]的 X 射线晶体结构,并研究了这两种类型的三肽键环辛二烯环的固态构象。环辛二烯基环的 1H 和 13C1H}1â3-Î-:5,6-C8H11 和 1â3-Î-:4,5-C8H11 配体的 1H 和 13C1H} NMR 光谱特征。