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。