Syntheses, Characterizations, and Properties of Five Interpenetrating Complexes Based on 1,4-Benzenedicarboxylic Acid and a Series of Benzimidazole-Based Linkers

Abstract

Five interesting interpenetrating networks, namely, [Co(p-bdc)(beb) 0.5 ] n (1), {[Co(p-bdc)(bmb)]·H 2 O} n (2), {[Co(pbdc)(bmp)]·H 2 O} n (3), {[Zn(p-bdc)(bmp)]·H 2 O} n (4), and [Zn 2 (pbdc) 2 (bmp)(H 2 O) 2 ] n (5) [p-H 2 bdc = 1,4-benzenedicarboxylic acid, beb = 1,4-bis(2-ethylbenzimidazol-1-ylmethyl)benzene, bmb = 1,4-bis(2-methylbenzimidazol-1-ylmethyl)benzene, and bmp = 1,5-bis(2-methylbenzimidazol) pentane], have been synthesized by employing mixed ligands of various benzimidazole-based ligands with p-H 2 bdc. Complex 1 possesses a 2-fold interpenetrating 3D framework with (4 12 ·6 3 )-pcu topology. Complex 2 exhibits a 3-fold interpenetrating 3D network with 6 6 -dia topology, and complex 3 displays a 4-fold interpenetrating 3D diamond network containing Co/bmp left-and right-handed helical chains. Obviously, with the reducing of the steric hindrance of the Ndonor ligand, complexes 1−3 show interpenetrating networks from 2-fold to 3-fold and 4-fold. Complex 4 is isostructural to 3 and also forms a 4-connected 3D framework with a diamond topology. Complex 5 features a 3D framework generated by 2D → 3D interpenetration and exhibits (8 2 ·10) 2 topology. Our study shows that the steric hindrance changing of ligands can tune the final interpenetrating networks directly.

Structures and Photoluminescence Properties of Four Cadmium(II) Coordination Polymers Synthesized by Rigid Ligands and N-Donor Ligands

“…Each Cd atom in 4 is bridged by dna into a 1D zig-zag chain along the a-axis (Fig. 6b), and is similar to the previously reported complex [Zn 2 (p-bdc) 2 (bmp)(H 2 O) 2 ] n obtained from reaction of Zn(NO 3 ) 2 Á6H 2 O with p-bdc ligand, [11,12] where p-H 2 bdc ¼ 1,4-benzenedicarboxylic acid and bmp ¼ 1,5-bis(2methylbenzimidazol) pentane). The adjacent 1D chains are further connected by the long dpp ligands resulting in the formation of the 3D framework (Fig.…”

Synthesis and Crystal Structure of a New Zn(II) Interpenetrating Complex Based on 1,4-bis(2-methyl-imidazol-1-yl)butane and 5-bromoisophthalic Acid

“…[3][4][5] Among diverse entangled MOFs, interpenetration is the most familiar phenomenon. To date, considerable efforts have been invested in interpenetrating MOFs and a great many interpenetrating networks have been reported by many groups [6][7][8][9] and some comprehensive reviews have been made by Robson, Batten, and Ciani et al [10][11][12] Summarizing from the large amount of reported works, we can draw a conclusion that long and low steric hindrance ligands will lead to larger voids that may result in high-fold interpenetrating structures. [13] Therefore, the effective strategy for constructing interpenetrating MOFs is to use long and low steric hindrance ligands.…”

An acylamide metal–organic framework with an unprecedented four-connecting trinodal topology and amide oxygen coordination

“…6(b), an intense emission occurs at 400 nm with the excitation wavelength at 320 nm. In comparison, the free L ligand shows an emission at 428 nm upon excitation at 300-350 nm at room temperature (Tzeng et al, 2008) and free benzene-1,4-dicarboxylic acid shows an emission at 369 nm with an excitation at 331 nm (Guo et al, 2012). Accordingly, the emission in (1) is most likely to originate from the L ligand through atransition, given the significant blue shift (28 nm) on going from L to (1) (Guo et al, 2012).…”