Influence of the Electronics of the Phosphine Ligands on the H−H Bond Elongation in Dihydrogen Complexes
作者:Saikat Dutta、Balaji R. Jagirdar、Munirathinam Nethaji
DOI:10.1021/ic7016769
日期:2008.1.1
p-isopropylbenzyl, 5a) have been prepared by protonating the precursor hydride complexes trans-[RuCl(H)(PP)(2)] using HBF(4).OEt(2). The dihydrogen complexes are quite stable and have been isolated in the solid state. The intact nature of the H-H bond in these derivatives has been established from the short spin-lattice relaxation times (T1, ms) and observation of substantial H, D couplings in the HD isotopomers. The
反式-[RuCl(eta(2)-H(2))(PP)(2)] [BF(4)]类型的钌的五个新的单阳离子二氢络合物(PP =双-1,2(二芳基膦基)乙烷,芳基=对氟苄基,1a,苄基,2a,间甲基苄基,3a,对甲基苄基,4a,对异丙基苄基,5a)是通过对前体氢化物络合物反式-[RuCl(H)(PP))进行质子化制备的(2)]使用HBF(4).OEt(2)。二氢配合物非常稳定,并且已经以固态分离。这些衍生物中HH键的完整性质是通过较短的自旋晶格弛豫时间(T1,ms)和观察到的HD同位素异构体中大量的H,D偶联而建立的。随着二膦配体上取代基的电子给体能力从对氟苄基到对异丙基苄基部分的增加,HH键距(dHH,A)从0.97 A逐渐增加到1.03A。反式-[Ru(eta(2)-H(2))(Cl)((C(6)H(5)CH(2))(2)PCH(2)CH(2)的d(HH)通过X射线晶体学发现,P(CH(2)C(6)H(5))(2))(2)]