Crystallisation from MeCN solutions containing copper(I) tetrafluoroborate, 2,9-dimethyl-1,10-phenanthroline (dmp) and either 2-cyanoguanidine (cnge) or one of its substituted derivatives, 2-cyano-N,Nâ²-dimethylguanidine (dmcnge) and 2-cyanoimino-4,6-pyrimidine (cidmp), by Et2O vapour diffusion methods yielded [Cu(dmp)(nitrile)][BF4]· xMeCN (nitrile = cnge, x = 1 2; dmcnge, x = 0; or cidmp, x = 0). In the absence of an added nitrile [Cu(dmp)(NCMe)][BF4] 3 formed. Crystallisation from CH2Cl2 solutions containing copper(I) tetrafluoroborate, dmp and cnge by Et2O vapour diffusion methods yielded [Cu(dmp)(cnge)][BF4]·0.5Et2O 1. Structural studies of 1, 2 and 3 have established that the [Cu(dmp)(nitrile)]+ cations are three-co-ordinate trigonal planar (Y-shaped) species with bidentate dmp and monodentate nitrile ligands. The MeCN molecule in 2 is hydrogen bonded to the cnge ligand in a position adjacent to the copper(I) atom. When 1, 2 and 3 are combined with a tetrahedral copper(I) species co-ordinated by a bidentate ligand, cnge and MeCN, they represent stages in a crystallographic sequence depicting associative substitution at trigonal planar copper(I). In solution an equilibrium [Ke = 3.9(6) at 298 K] exists between [Cu(NCMe)4]+, [Cu(dmp)(nitrile)x]+ (x = 1 or 2) and [Cu(dmp)2]+ cations, indicating that the stability of the [Cu(dmp)(nitrile)]+ cations in the solid phase must be due to intermolecular packing interactions. For all three structurally characterised complexes, ÏâÏ (face-to-face) stacking interactions between co-ordinated dmp molecules generate an efficient parallel packing system thus promoting the trigonal planar copper(I) co-ordination geometry.
从含有四
氟硼酸铜(I)、2,9-二甲基-
1,10-菲罗啉(dmp)和 2-
氰基
胍(cnge)或其取代衍
生物之一的 MeCN 溶液中结晶、2-
氰基-N,N²-二甲基
胍(dmcnge)和 2-
氰基
亚胺-4,6-
嘧啶(cidmp),通过 Et2O 蒸汽扩散法得到 [Cu(dmp)(腈)][BF4]Â- xMeCN(腈 = cnge,x = 1 2;dmcnge, x = 0; 或 cidmp, x = 0)。在没有添加腈的情况下,形成[Cu(dmp)(NCMe)][BF4] 3。用 Et2O 蒸汽扩散法从含有四
氟硼酸铜、dmp 和 cnge 的
CH2Cl2 溶液中结晶得到 [Cu(dmp)(cnge)][BF4]Â-0.5Et2O 1。对 1、2 和 3 的结构研究表明,[Cu(dmp)(nitrile)]+ 阳离子是具有双齿 dmp 和单齿 nitrile
配体的三坐标三叉平面(Y 形)物种。2 中的 MeCN 分子与 cnge
配体氢键结合在
铜(I)原子的邻近位置。当 1、2 和 3 与由双齿
配体、cnge 和 MeCN 配位的四面体
铜(I)结合时,它们代表了晶体学序列中描述三叉平面
铜(I)关联置换的阶段。在溶液中,[Cu(NCMe)4]+、[Cu(dmp)(腈)x]+(x = 1 或 2)和[Cu(dmp)2]+阳离子之间存在平衡[Ke = 3.9(6),298 K],这表明固相中[Cu(dmp)(腈)]+阳离子的稳定性必须归功于分子间的堆积相互作用。对于所有三种结构表征的配合物,配位的 dmp 分子间的ÏâÏ(面对面)堆积相互作用产生了一个有效的平行堆积系统,从而促进了
铜(I)的三叉平面配位几何。