Triangular tricopper(i) clusters supported by donor-substituted triazacyclohexanes
作者:Randolf D. Köhn、Lorena Tomás Laudo、Zhida Pan、Fredy Speiser、Gabriele Kociok-Köhn
DOI:10.1039/b819268e
日期:——
Triazacyclohexanes (R3TAC, 1a–i) with pyridyl or thioether functionalities (R) in the N-substituents react with three equivalents of CuX (X = Cl (2), Br (3) or I (4)) in MeCN to give the triangular tri-copper clusters [R3TAC(CuX)3] (R = 2-pyridylmethyl (2a, 3a), 5-tbutyl-2-pyridyl (3b), 2-(3-phenylpropylthio)ethyl (3c), 2-(2-ethyl-butylthio)ethyl (3d), 2-(4-heptylthio)ethyl (2e, 3e), 2-(1-heptylthio)ethyl (3f), 2-(2,4,6-trimethyl-benzylthio)ethyl (3g), 2-(o-methyl-benzylthio)ethyl (3h) and 2-(o-fluoro-benzylthio)ethyl (2i, 3i, 4i)). The thioether complexes are stable towards air and water. The bromide bridge in the clusters can be replaced by chloride (2c, e, f, i) or iodide (4c, e, f, i) by the reaction of a dichloromethane solution of the cluster with aqueous NaI or AgCl, respectively. Crystal structures of 2a, 3a, 3b, 2e, 3h and 4i show triangular halide-bridged Cu3 clusters capped by the triazacyclohexane and stabilised by the coordination of one pyridyl or thioether arm to each copper atom. DFT calculations confirm the NMR assignments and reveal the electronic structure of the copper triangle.
N 取代基中含有吡啶基或硫醚官能团(R)的三氮杂环己烷(R3TAC,1a-i)与三当量的 CuX(X = Cl (2)、Br (3) 或 I (4))在 MeCN 中发生反应,生成三角形三铜簇 [R3TAC(CuX)3] (R = 2-吡啶甲基(2a,3a)、5-丁基-2-吡啶 (3b)、2-(3-苯基丙硫基)乙基 (3c)、2-(2-乙基丁硫基)乙基 (3d)、2-(4-庚硫基)乙基 (2e,3e)、2-(1-庚硫基)乙基 (3f)、2-(2,4,6-三甲基-苄硫基)乙基 (3g)、2-(邻甲基-苄硫基)乙基 (3h) 和 2-(邻氟-苄硫基)乙基 (2i、3i、4i))。硫醚络合物对空气和水都很稳定。通过将簇合物的二氯甲烷溶液与 NaI 或 AgCl 水溶液反应,簇合物中的溴桥可以分别被氯化物(2c, e, f, i)或碘化物(4c, e, f, i)取代。2a、3a、3b、2e、3h 和 4i 的晶体结构显示了由三氮杂环己烷封端的三角形卤桥 Cu3 簇,并通过每个铜原子上的一个吡啶基或硫醚臂的配位得到稳定。DFT 计算证实了核磁共振的分配,并揭示了铜三角的电子结构。