Diversification of ligand families through ferroin–neocuproin metal-binding domain manipulation
作者:Edwin C. Constable、Catherine E. Housecroft、Markus Neuburger、Pirmin J. Rösel、Silvia Schaffner
DOI:10.1039/b905988a
日期:——
Derivatization of 5,5â²-bis(3-hydroxyphenyl)-2,2â²-bipyridine to give two new ligands, 3 and 4, which possess terminal alkene functionalities is described. The syntheses and characterization of the palladium(II) complexes [Pd(3)2][BF4]2 and [Pd(4)2][BF4]2, and the related [Pd(2)2][BF4]2 in which 2 is 5,5â²-bis(3-methoxyphenyl)-2,2â²-bipyridine are reported. The labile nature of the ligand leads to [Pd(2)2][BF4]2 co-crystallizing with the free ligand as [Pd(2)2][BF4]2·2; in the solid state, the ligands in the [Pd(2)2]2+ cation distort (a âbow-inclineâ distortion) to alleviate bpy H6â¯H6 repulsions. Compound 2 has been converted to 5,5â²-bis(3-methoxyphenyl)-6-methyl-2,2â²-bipyridine (5) and 5,5â²-bis(3-methoxyphenyl)-6,6â²-dimethyl-2,2â²-bipyridine (6) to produce ligands suited to forming air-stable, copper(I) complexes of type [CuL2]+. [Cu(5)2][PF6] and [Cu(6)2][PF6] have been prepared and characterized, and the single crystal structures of 6 and [Cu(5)2][PF6]·0.1C2H4Cl2·0.15CH2Cl2 are described. By altering the conditions under which 2 is methylated, competitive formation of 5,5â²,5â³,5â´-tetrakis(3-methoxyphenyl)-2,2â²:3â²,3â³:2â³,2â´-quaterpyridine occurs.
描述了 5,5-双(3-羟基苯基)-2,2-联吡啶的衍生化,得到两个具有末端烯烃官能团的新配体 3 和 4。钯(II)配合物[Pd(3)2][BF4]2和[Pd(4)2][BF4]2以及相关[Pd(2)2][BF4]2的合成和表征报道了其中2是5,5-双(3-甲氧基苯基)-2,2-联吡啶。配体的不稳定性质导致[Pd(2)2][BF4]2 与游离配体共结晶为[Pd(2)2][BF4]2·2;在固态下,[Pd(2)2]2+ 阳离子中的配体发生扭曲(“弓形倾斜”扭曲)以减轻 bpy H6−H6 排斥。化合物 2 已转化为 5,5-双(3-甲氧基苯基)-6-甲基-2,2-联吡啶 (5) 和 5,5-双(3-甲氧基苯基)-6,6â 2-二甲基-2,2-联吡啶 (6) 生成适合形成空气稳定的 [CuL2]+ 型铜 (I) 配合物的配体。制备并表征了[Cu(5)2][PF6]和[Cu(6)2][PF6],以及6和[Cu(5)2][PF6]·0.1C2H4Cl2·的单晶结构描述了0.15CH2Cl2。通过改变 2 甲基化的条件,竞争性形成 5,5-,5-,5-四(3-甲氧基苯基)-2,2-:3-,3-:2-生成3,2-四联吡啶。