Supramolecular isomers of metal–organic frameworks: the role of a new mixed donor imidazolate-carboxylate tetradentate ligand
作者:Victoria J. Richards、Stephen P. Argent、Adam Kewley、Alexander J. Blake、William Lewis、Neil R. Champness
DOI:10.1039/c2dt12055k
日期:——
Five new metalâorganic frameworks prepared from the ligand 5-bis(3-(1-imidazolyl)propylcarbamoyl)terephthalate (bipta2â) and transition metal salts, Zn2+ (1), Co2+ (2), Mn2+ (3, 4) and Cu2+ (5), are reported. Single crystal X-ray studies reveal that the bipta2â ligand acts as a tetradentate ligand and combines with four-coordinate cationic metal nodes to give four-connected framework structures. Whilst reaction of bipta2â with Zn(II) gives rise to a framework of diamondoid topology 1, the analogous frameworks with Co(II), Mn(II) and Cu(II) afford frameworks that incorporate square-planar nodes. Whereas 2 and 5 form frameworks of Cd(SO4) (cds) and square 44 nets (sql), respectively, reaction of Mn(II) with bipta2â forms two supramolecular isomers of topology cds for 3 and sql for 4.
报告了由配体 5-双(3-(1-咪唑基)丙基氨基甲酰基)对苯二甲酸盐 (bipta2â) 和过渡金属盐 Zn2+ (1)、Co2+ (2)、Mn2+ (3, 4) 和 Cu2+ (5) 制备的五种新型金属有机框架。单晶 X 射线研究显示,bipta2â 配体作为四价配体,与四价阳离子金属节点结合,形成四连接框架结构。bipta2â 与 Zn(II)反应生成菱形拓扑结构的框架 1,而与 Co(II)、Mn(II)和 Cu(II)反应生成的类似框架则包含方形平面节点。2 和 5 分别形成 Cd(SO4)(cds)和 44 方网(sql)框架,而 Mn(II)与 bipta2â 反应则形成两种超分子异构体,3 的拓扑结构为 cds,4 的拓扑结构为 sql。