Complexes of divalent Cu, Ni, Pd and Pt with 3S-aminopyrrolidine (S-ap) have been prepared and characterised by a combination of NMR, CD, electronic, IR and microanalytical techniques. The chosen chirality of the stereogenic carbon (S) forces the secondary nitrogen to adopt the R stereochemistry on co-ordination with the conformation of the 5-membered chelate being λ. The planar [M(S-ap)₂]²⁺ complexes exist as a mixture of cis and trans isomers in the solid state and in solution. The trans arrangement is forced upon co-ordination of an axial donor (X = halide, thiocyanate or nitrite) in the five-co-ordinate ions [Cu(S-ap)₂X]⁺. Methylation of the primary amine of S-ap generates another secondary nitrogen centre in the new ligand 3S-(methylamino)pyrrolidine, S-meap. This exocyclic nitrogen is not restricted to a single configuration on co-ordination. The complexes [M(S-meap)Cl₂], where M = Pd or Pt, have been prepared and characterised. Both diastereoisomers (R- and S-N_Me) of [Pd(S-meap)Cl₂] crystallise from aqueous solution as distinct crystal forms which can be separated by mechanical means. The structure of the N_Me(R) isomer has been determined by X-ray crystallography.

中文翻译：

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3的协调化学小号-aminopyrrolidine和3小号（甲基氨基）吡咯烷- ：二氯的两种非对映的结晶[3小号- （[R ，小号甲氨基）吡咯烷]合钯（II）

已经制备了二价Cu，Ni，Pd和Pt与3 S-氨基吡咯烷（S -ap）的配合物，并通过NMR，CD，电子，IR和微量分析技术进行了表征。立体碳（S）的选定手性迫使次级氮在与5元螯合物的构象为λ配位的情况下采用R立体化学。平面[M（S -ap）₂ ] ²⁺络合物以顺式和反式异构体的混合物形式存在，呈固态且呈溶液状态。该反式在五坐标离子[Cu（S -ap）₂ X] ^+中轴向供体（X =卤化物，硫氰酸根或亚硝酸根）的配位时，强制进行排列。S -ap伯胺的甲基化在新的配体3 S-（甲基氨基）吡咯烷S -meap中产生另一个仲氮中心。该环外氮不限于配位的单一构型。已经制备并表征了配合物[M（S- meap）Cl ₂ ]，其中M ＝ Pd或Pt。[Pd（S -meap）Cl _2的两种非对映异构体（R-和S -N _Me）]从水溶液中结晶为不同的晶体形式，可以通过机械手段将其分离。N _Me（R）异构体的结构已通过X射线晶体学测定。