two-stranded helical structures; racemization of the P and M enantiomers is much more facile in the Ag(I) case 3 but has a barrier of around 65 kJ/mol in the Cu(I) case 6, which is rationalized on the basis of the different coordination chemistry preferences of these two metal ions. 3 may bind two further Ag(I) ions to the central pyridazine N, giving 5. Treatment of 1Br with Br2 leads to bromination at the
哒嗪桥联的NHC /
吡唑配体L(HL = 3- [3-(2,4,6-三甲基苯基)-3 H-
咪唑-1-基] -6-(
3,5-二甲基吡唑-1-基) (-
哒嗪)提供了有机
金属和经典的N供体隔室,可作为多种均
金属和异
金属
金(I)卡宾配合物的多功能支架。络合物[
LAuX](1 Cl,X = Cl; 1 Br,X = Br),[L 2 Au](PF 6)(2),[L 2 AuAg](BF 4)(PF 6)(3), [L 2 AuAg 3(MeCN)6 ](BF 4)4(5),和[L 2 AuCu的](OTF)0.75(PF 6)1.25(6)已经被用X射线晶体学。在所有情况下的Au(I)结合到NHC部位,同时所述附加的Ag(I)在3中或Cu(I)6被容纳在
吡唑衍生的位点。两个3和6形成两个链螺旋结构; P和M对映异构体的消旋化在Ag(I)情况3下更容易实现,但在Cu(I)情况6下具有约65 kJ /