Supramolecular isomers of metal–organic frameworks: the role of a new mixed donor imidazolate-carboxylate tetradentate ligand

Abstract

Five new metal-organic frameworks prepared from the ligand 5-bis(3-(1-imidazolyl)propylcarbamoyl)terephthalate (bipta(2-)) and transition metal salts, Zn(2+) (1), Co(2+) (2), Mn(2+) (3, 4) and Cu(2+) (5), are reported. Single crystal X-ray studies reveal that the bipta(2-) ligand acts as a tetradentate ligand and combines with four-coordinate cationic metal nodes to give four-connected framework structures. Whilst reaction of bipta(2-) 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(SO(4)) (cds) and square 4(4) nets (sql), respectively, reaction of Mn(II) with bipta(2-) forms two supramolecular isomers of topology cds for 3 and sql for 4.

Manganese(ii) and copper(ii) nitrate bis-imidazole coordination polymers: dimensionality and product morphology

“…Indeed, these two coordination networks can be considered supramolecular structural isomers, 14,21,22 where the networks possess the same overall composition and similar metal coordination, yet different structural features. Indeed, these two coordination networks can be considered supramolecular structural isomers, 14,21,22 where the networks possess the same overall composition and similar metal coordination, yet different structural features.…”

“…Inspired by a study by Maspoch et al 12 we decided to investigate the use of bis-imidazole ligands in the synthesis of coordination polymer nanospheres. 14 Secondly, the ligand we have chosen, BIPNDI, is built around a 1,4,5,8-naphthalene-tetracarboxylicdiimide (NDI) core and thus imparts a greater likelihood of intermolecular π-π stacking interactions 15 in comparison to simpler bis-imidazole ligands such as 1,4-bis(imidazol-1-ylmethyl)benzene employed by Maspoch and co-workers. Our choice of ligand was inspired by two key features.…”

Hydrothermal synthesis, crystal structure, and luminescent property of a cobalt(II) complex based on carbazole derivative

“…The structural topologies of the resulting supramolecular complexes are affected by many factors such as organic ligands, metal ions, synthetic methods, and so on [11][12][13]. Among these, organic ligands have signif icant influences on the desirable supramolecular coor dination complexes.…”

Solvent‐Ratio Dependency of Polymorphism of Silver(I) Complexes Containing 1,2,3‐Tris(Isoniconitoyloxy)Benzene

“…[6][7][8][9] In many cases, introduction of flexible organic ligands as spacers for supramolecular assemblies provides an opportunity to adopt at least two different conformations and various coordination modes together with their traditional role including the coordination to the central metal ions. [14][15][16][17] In this context, whereas there have been a number of reports on the formation of isomeric coordination polymers taking into account solvent-, template-, additive-, and temperature-dependency during last decades, [18][19][20][21][22] rational control of the construction of particular supramolecules formed from the same components by means of external conditions such as pH, additives, solvent, and crystallization temperature remains a significant challenge. [10][11][12][13] Systematic studies on supramolecular isomerism by the same molecular building blocks will allow us to obtain better insight into the factors influencing the structures and crystal growth of novel crystalline materials.…”