Eight Two-Dimensional and Three-Dimensional Metal−Organic Frameworks Based on a Flexible Tetrakis(imidazole) Ligand: Synthesis, Topological Structures, and Photoluminescent Properties

Abstract

Eight new metal-organic frameworks based on the tetrakis(imidazole) ligand tetrakis(imidazol-1-ylmethyl)methane (L), namely, [Zn 2 (L) O (8), where H 2 L 1 = 1,4-benzenedicarboxylic acid, H 3 L 2 =1,3,5-benzenetricarboxylic acid, and H 4 L 3 =1,2,4,5-benzenetetracarboxylic acid, have been synthesized under hydrothermal conditions. Compounds 1 and 2 were isolated by the reactions of L with inorganic SO 4 2anions. Compound 1 displays a 2-fold interpenetrated PtS net. Compound 2 possesses a binodal (4,6)-connected topology with the Schl€ afli symbol of (3 3 4 3 5 3 3 6)(3 2 3 4 3 5 4 3 6 7 3 7). Compounds 3-8 have been obtained by the reactions of L with organic carboxylate ligands. Compound 3 shows a trinodal (3,4)-connected topology with the Schl€ afli notation of (6 6 )(6 5 3 8)(6 3 ). Compound 4 is isostructural with 3. The compound 5 is a binodal (3,4)-connected two-dimensional (2D) net with the the Schl€ afli notation of (6 2 3 8) (4 3 6 4 3 8). 6 shows a trinodal (3,4)-connected framework with the Schl€ afli symbol of (4 3 8 2 ) 2 (4 2 3 8 4 )(8 4 3 12 2 ). Compound 7 exhibits a pentanodal net with the Schl€ afli symbol of (4 3 6 3 8 4 )(4 2 3 6 4 )(4 2 3 8 4 )(4 2 3 8 3 3 10)(4 3 6 2 3 8 3 ). Compound 8 is a rare 4-connected 2D net with the Schl€ afli symbol of (4 3 3 6 3 ). The influence of the metal atoms and ligands on the structures of the coordination polymers has been discussed. The infrared spectra, thermogravimetric analysis, and luminescent properties were also investigated for the compounds.

Crystal structure of poly[1,4-bis(2-methylbenzimidazol)butane-κ2 N:N′)bis(4,4′-oxybis(benzoato-κ4 O,O′:O′′,O′′′)dicadmium] monohydrate, C48H38Cd2N4O10

“…And the exibility of ligands is essential to forming some particular properties and structures [8][9][10]. The secondary ligands are selected to tune up the structures of complexes [11]. It is well-known that multidentate O-donor organic aromatic carboxylate ligands, such isomeric aromatic dicarboxylate ligands as phthalate (1,2-benzenedicarboxylate, 1,2-bdc), isophthalate (1,3-bdc), or terephthalate (1,4-bdc) [12], have been extensively employed in the construction of a variety of high-dimensional structures [8].…”

Crystal structure poly-(μ2-1-(4-(1H-imidazol-1-yl)benzyl)-1H-1,2,4-triazolyl-κ2 N N 1:N 2 N)-(μ3-2,2′-(1,2-phenylene)diacetato-κ5-O 1,O 2:O 2:O 3,O

“…Assemble of coordination polymers (CPs) based on metal and organic building blocks has been expanding in recent years, not only because of fascinating structural diversities and framework topologies, but also due to their potential applications in the elds of gas storage, catalysis, magnetism, luminescence, and so on [1][2][3][4]. The extension of framework topologies or chemical compositions for such materials has been tremendously accelerated because new frameworkforming elements can adopt various coordination geometries to produce some previously unknown framework structures.…”

Co-Crystal structure of 1,3-phenylenediacetic acid and 2,5-bis(4-pyridyl)- 1,3,4-oxadiazole (1:1), C22H18N4O5

“…Featuring two carboxyl groups in the title molecule may provide hydrogen-bonding interactions which may endow enormous potential for assembling multi-dimensional supramolecular architectures [6,7]. On the other hand, the introduction of nitrogen heterocyclic compound can alter the electron density in different parts of the molecules due to the prototropy and conjugation between aromatic nitrogen heterocyclic [8,9]. Formation of the 1:1 cocrystal of 1,3-phenylenediacetic acid and 2,5-bis(4-pyridyl)-1,3,4-oxadiazole, results in the formation zig-zag chains by virtue of O4-H4×××N1 #1 and O1-H1×××N4 hydrogen bonding interactions in the title structure.…”