Optically active co-ordination compounds. Part XXXVII. Circular dichroism of labile trioxalatometallate(III) complexes
作者:R. D. Gillard、D. J. Shepherd、D. A Tarr
DOI:10.1039/dt9760000594
日期:——
From solutions of kinetically labile or inert racemic complexes of the type [M(C2O4)3]3–(M = V, Cr, Mn, Fe, or Co), addition of the resolving ions Λ- or Δ-[M′(en)3]3+(M′= Co or Rh; en = ethylenediamine) causes precipitation of diastereoisomeric salts [M′(en)3][M(C2O4)3]·xH2O. All the salts except that of FeIII show circular dichroism in the visible region when measured as dispersions in CsCl discs
从[M(C 2 O 4)3 ] 3–型(M = V,Cr,Mn,Fe或Co)的动力学不稳定或惰性外消旋复合物的溶液中,添加解析离子Λ-或Δ-[ M'(en)3 ] 3+(M'= Co或Rh; en =乙二胺)引起非对映异构盐[M'(en)3 ] [M(C 2 O 4)3 ]· x H 2 O的沉淀。除Fe III以外的所有盐当以CsCl圆片中的分散体进行测量时,在可见光区域显示出圆二色性。所有的盐都是同晶的,因此,根据难溶性非对映异构体的规律,可以进行立体化学相关。绝对构型分配给了三草酸酯物种。圆二色性光谱还证实了(–)[Rh(en)3 ] 3+的Λ构型。