Molecular rectangles from metallomacrocycles: development of dibenzofuran ligands
作者:Paula L. Caradoc-Davies、Lyall R. Hanton
DOI:10.1039/b300761h
日期:2003.4.17
Two new ligands 4,6-bis(4′-pyridylsulfide)dibenzofuran L1 and 4,6-bis(methylsulfanylmethyl)dibenzofuran L2, based on dibenzofuran with exodentate thio-pyridine arms were prepared. The crystal structures of three metallomacrocycles were determined. Reaction of L1 with AgClO4 in a 1 : 1 metal-to-ligand ratio gave a ClO4− clamped metallomacrocycle, 1. The analogous reaction with CuCl2 gave a metallomacrocycle, 2, in which bridging chloride ions bisected the macrocycle. Both metallomacrocycles were rectangular in shape but their cavities were occluded by bridging interactions. Reaction of L2 with CuI in a 1 : 2 metal-to-ligand ratio gave a metallomacrocycle, 3, in which Cu2I2 moieties were incorporated into the edge of the macrocycle. This allowed for clearly defined cavities, which formed channels containing MeCN molecules in the overall three-dimensional honeycomb array.
基于二苯并呋喃并带有末端硫代吡啶配体臂的两个新配体,4,6-双(4′-吡啶硫醚)二苯并呋喃L1和4,6-双(甲硫基甲基)二苯并呋喃L2,已被合成。确定了三种金属大环化合物的晶体结构。L1与AgClO4以1:1的金属-配体比例反应,得到了一个由ClO4^-夹合的金属大环1。类似的反应中使用CuCl2得到了金属大环2,其中桥联的氯离子将大环一分为二。这两个金属大环均为矩形,但其内部空腔被桥联作用所阻塞。L2与CuI以1:2的金属-配体比例反应,得到金属大环3,其中Cu2I2单元嵌入大环边缘。这使得其空腔清晰定义,并在整体的三维蜂窝阵列中形成了包含MeCN分子的通道。