Cationic, arylbismuth(III) complexes of the form [BiR2L2]+ and [BiRL4]2+ where L is a neutral two-electron donor ligand
作者:Claire J. Carmalt、Louis J. Farrugia、Nicholas C. Norman
DOI:10.1039/dt9960000443
日期:——
Synthetic and structural studies have been made for a range of cationic, ten-electron, four-co-ordinate, diarylbis(ligand)bismuth(III) complexes. Reactions between BiPh2Br, AgBF4 and 2 equivalents of a two-electron donor ligand L afforded the ionic complexes [BiPh2L2][BF4][L = OPPh3 or pyridine (py)]. The first was characterised by X-ray crystallography and comprises [BiPh2(OPPh3)2]+ cations, tetrafluoroborate anions and CH2Cl2 molecules of crystallisation. The bismuth centre is four-co-ordinate with a disphenoidal geometry in which the aryl groups are in equatorial positions with the ligands in axial sites. A long interaction is present between the bismuth centre and one of the fluorines of the BF4 group. A series of similar reactions were also carried out between BiR2Br (R = aryl), TlPF6 and 2 equivalents of L affording the ionic complexes [BiR2L2][PF6][R = Ph, L = OP(NMe2)3 or py; R = 4-MeC6H4, L = OP(NMe2)3; R = 2,4,6-Me3C6H2, L = OP(NMe2)3 or OPPh3]. Two of the complexes have also been characterised by X-ray crystallography, the cations having similar structures to that found in [BiPh2(OPPh3)2][BF4]. The reaction between BiPhBr2, 1 equivalent of TlPF6 and an excess of OP(NMe2)3 afforded the ionic complex [BiPhOP(NMe2)3}4][PF6]2. The crystal structure of the dication comprises a square-based pyramidal bismuth centre with an apical phenyl group and four basal OP(NMe2)3 ligands. Examples of some dihalogenobismuth cations have also been obtained and their structures are described and compared with those of previously reported examples.
对一系列阳离子、十电子、四配位、二芳基双(配体)铋(III)络合物进行了合成和结构研究。 BiPh2Br、AgBF4 和 2 当量的双电子供体配体 L 之间的反应提供了离子配合物 [BiPh2L2][BF4][L = OPPh3 或吡啶 (py)]。第一个通过 X 射线晶体学进行表征,包含 [BiPh2(OPPh3)2]+ 阳离子、四氟硼酸根阴离子和 CH2Cl2 结晶分子。铋中心为四配位,具有蝶形几何形状,其中芳基位于赤道位置,配体位于轴向位点。铋中心和 BF4 基团的一个氟之间存在长相互作用。 BiR2Br(R = 芳基)、TlPF6 和 2 当量的 L 之间也进行了一系列类似的反应,得到离子配合物 [BiR2L2][PF6][R = Ph, L = OP(NMe2)3 或 py; R = 4-MeC6H4,L = OP(NMe2)3; R = 2,4,6-Me3C6H2,L = OP(NMe2)3 或 OPPh3]。其中两种配合物也已通过 X 射线晶体学进行了表征,其中的阳离子具有与 [BiPh2(OPPh3)2][BF4] 中发现的相似结构。 BiPhBr2、1当量的TlPF6和过量的OP(NMe2)3之间的反应提供了离子络合物[BiPhOP(NMe2)3}4][PF6]2。双阳离子的晶体结构包含一个带有顶部苯基的方形金字塔铋中心和四个基础 OP(NMe2)3 配体。还获得了一些二卤铋阳离子的实例,描述了它们的结构并与先前报道的实例进行了比较。