spectroscopy, and the structure was confirmed by X-ray crystallography. The P was employed as an effective hydrogen-bond-donor catalyst for Michael reactions of a series of water-insoluble nitro-olefins in an aqueous medium. The P showed better catalytic activity compared to the urea-based ligand L1 and the triangle T. Moreover, the confined nanospace of P in addition to large product outlet windows makes
双位尿素“支柱”(L1) 与顺式-(tmen)Pd(NO3)2 反应产生 [3+3] 自组装分子三角形 (T) [L1 = 1,4-di(4-pyridylureido)苯; tmen = N,N,N',N'-四甲基乙烷-1,2-二胺]。用 Pd(NO3)2 和夹式供体 (L2) 的等摩尔混合物代替上述反应中的 cis-(tmen)Pd(NO3)2 产生了无模板的多组分 3D 三棱柱 (P),并用多种尿素装饰[L2 = 3,3'-(1H-1,2,4-三唑-3,5-二基)二吡啶]。该棱镜 (P) 由 NMR 光谱表征,其结构由 X 射线晶体学证实。P被用作一系列水不溶性硝基烯烃在水性介质中的迈克尔反应的有效氢键供体催化剂。与尿素基配体 L1 和三角形 T 相比,P 表现出更好的催化活性。此外,除了大的产品出口窗口外,P 的受限纳米空间使这种 3D 结构成为催化 9-羟甲基蒽与 N-取代马来酰亚胺在水性介质中的