R-Isophthalate (R = –H, –NO₂, and –COOH) as modular building blocks for mixed-ligand coordination polymers incorporated with a versatile connector 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole

Abstract

A series of nine Co II , Cu II , and Cd II mixed-ligand coordination complexes with a 3,39-dipyridyl connector 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole (3-bpt) have been achieved, by changing the incorporated benzenedicarboxylic co-ligands from isophthalic acid (H 2 ip) to its 5-substituted derivatives 5-nitroisophthalic acid (-NO 2 , H 2 nip) and trimesic acid (-COOH, H 3 tma). All compounds have been structurally determined by the X-ray diffraction technique. It is indicated that most of them are coordination polymers, with the ligands of benzenecarboxylic acids being doubly deprotonated to compensate the charge and bridge the metal ions, except for a monomeric ion-pair product 2 (H 2 O) 4 ]?(H 2 tma) 2 ?(H 2 O) 2 (1c). These polymers display a variety of coordination frameworks, such as 1-D double-strand chain, 2-D layer with (4,4) topology, 2-D double layer, 2-D layer with (6,3) topology and 1-D molecular ladder etc. The results evidently reveal the profound substituent effect of the R-isophthalate building blocks on engineering such coordination arrays, in virtue of the versatility of 3-bpt with diversiform configurations and binding fashions. Nevertheless, the choice of metal ion is also significant in the structural assembly, and the low-dimensional coordination networks are further extended to diverse 3-D supramolecular crystalline lattices via noncovalent interactions especially hydrogen bonding. Solid-state properties such as thermal stability and fluorescence have also been investigated.

Crystal structure of triaqua-(2,2′-bipyridine)-(5-nitroisophthalato)- nickel(II) monohydrate, Ni(H2O)3(C10H8N2)(C8H3NO6) · H2O

“…They can be regarded not only as hydrogenbonding acceptors but also as hydrogen-bonding donors, depending upon the number of deprotonated carboxylate groups. 5-Nitroisophthalic acid (NIP) is an appropriate ligand for the construction of metal-containing supramolecular networks, exemplified by many transition-metal-based coordination polymers [5][6][7][8]. The asymmetric unit of the title crystal structure contains one Ni atom, one NIP 2-ligand, one 2,2'-bipyridine ligand, three aqua ligands and one lattice water molecule.…”

Crystal structure of poly[bis-μ3-[(2-(1,2,4-triazol-1-yl)acetato-κ3 O:O':N)]- cobalt(II), [Co(C4H4N3O2)2]n, C8H8CoN6O4

“…Al arge number of mononuclear,o ligonuclear,a nd polynucleart ransitionmetal complexes of 1-and 4-substituted 1,2,4-triazole derivatives have been synthesized and characterized [5][6][7][8]. On the other hand, because of the diversity of the coordination modes and high structural stability, carboxylate ligands are frequently used for the construction of MOFs [9][10][11]. In this paper, we select 2-(1,2,4-triazol-1-yl)acetate (tza)toreactwith Co(II)ions to obtainanew MOF.…”

Crystal structure of aqua-(1,10-phenanthroline)-(2-(1,2,4-triazol-1-yl)- acetate)copper(II)nitrate, C16H14CuN6O6

“…A large number of mononuclear, oligonuclear, and polynuclear transition metal complexes of 1-and 4-substituted 1,2,4-triazole derivatives have been synthesized and characterized due to their interesting properties and novel topologies [5][6][7][8]. On the other hand, because of the diversity of the coordination modes and high structural stability, carboxylate ligands are frequently used for the construction of MOFs [9][10][11]. In this paper, we selected 2-(1,2,4-triazol-1-yl)acetate (tza) and 1,10-Phenanthroline (phen) to react with Cu(II) ions to obtain a new MOF.…”