Revisiting the 1,2,4-Triaza-3,5-diborolyl Ligand: σ and π Coordination Modes in the Alkali Metal and Rhodium Complexes of a Planar, 6-π-Electron B<sub>2</sub>N<sub>3</sub><sup>-</sup> Ring
作者:Hanh V. Ly、Joanna H. Chow、Masood Parvez、Robert McDonald、Roland Roesler
DOI:10.1021/ic7013286
日期:2007.10.1
precursor 1. The alkali metal derivatives were characterized by multinuclear NMR, mass spectrometry, and single-crystal X-ray diffraction. The structural determinations revealed extended 2D structures for 2a and 2b and an extended 1D structure for 2c. All three solvent-free structures are dominated by sigma interactions, and pi interactions are also present for the potassium derivative. Addition of triphenylborane
1-甲基-3,5-二苯基-4-甲基氨基-1,2,4-三氮杂-3,5-二硼烯丙基的锂(2a),钠(2b)和钾(2c)盐是通过将其去质子化而制得的中性前体1中的环氮。通过多核NMR,质谱和单晶X射线衍射对碱金属衍生物进行了表征。结构确定显示2a和2b的扩展2D结构和2c的扩展1D结构。所有三个无溶剂结构均以sigma相互作用为主,并且钾衍生物也存在pi相互作用。将三苯基硼烷加到2a,2b和2c中分别生成加合物3a,3b和3c,并通过多核NMR和质谱对其进行表征。已经对锂盐和钾盐进行了结构确定,表明Ph3B配位在环的2位,而碱金属则被侧基甲基氨基配位。锂离子还由3a的单体结构中的三个乙腈分子配位,而钾离子由3个苯基的配位结构,形成3c的一维聚合物结构。2a与[Rh(cod)Cl] 2的反应生成二聚体4,该二聚体4包含两个1,2,4-三氮杂3,5-二硼烯丙基环,该两个桥环通过无取代基的环氮原子桥接两个Rh(cod)片段。