A Series of Zinc(II) 3D → 3D Interpenetrated Coordination Polymers Based On Thiophene-2,5-dicarboxylate and Bis(Imidazole) Derivative Linkers

Abstract

Six coordination polymers of Zn(II) ions and three organic linkers namely, [Zn(μ 4 -tdc)(μ-bmeib) 0.5 ] n (1), [Zn(μ 4 -tdc)(μ-betib) 0.5 ] n (2), [Zn(μ 4 -tdc)(μ-bisopib) 0.5 ] n (3), [Zn(μ 4 -tdc)(μ-pbmeix) 0.5 ] n (4), [Zn(μ 4 -tdc)(μ-pbetix) 0.5 ] n (5), [Zn(μ 4 -tdc)(μ-pbisopix) 0.5 ] n (6), bisopib, pbetix, and pbisopix, where H 2 tdc = thiophene-2,5-dicarboxylic acid, bmeib = 1,4-bis(2-methyl-1H-imidazol-1-yl)butane, betib = 1,4-bis(2-ethyl-1H-imidazol-1-yl)butane, bisopib = 1,4-bis(2-isopropyl-1H-imidazol-1-yl)butane, pbmeix = 1,4-bis((2-methyl-1H-imidazol-1-yl)methyl)benzene, pbetix = 1,4-bis((2-ethyl-1H-imidazol-1-yl)methyl)benzene, pbisopix = 1,4-bis((2-isopropyl-1H-imidazol-1-yl)methyl)benzene, have been synthesized and structurally characterized by elemental analysis, IR spectra, NMR spectra and single-crystal and powder X-ray diffractions. Compounds 1−6 are isostructural and display a 3D cubic structure with 2-fold interpenetrated nets. Two crystallographically independent Zn(II) ions are bridged by four different thiopehene-2,5-dicarboxlylate linkers adopting a bis(monodentate) coordination mode to form a paddle-wheel unit forming two-dimensional layers. These 2D layers containing paddle-wheel unit are further pillared by bridging bis(imidazole) derivative linkers forming a 3D framework. Moreover, topological analyses show that two 3D frameworks are interlocked with each other to give a 2-fold interpenetrating pcu net with 4 12 .6 3 topology. Interestingly, compound 3 is a 2-fold heterointerpenetrating 2(1 + 1) three-dimensional (3D) framework. In addition, photoluminescence properties, thermal stabilities and Cu(II) ion exchange properties of the compounds were also investigated.

Cobalt(II) and silver(I) coordination polymers containing flexible bis (benzimidazol‐1‐yl)hexane ligands: synthesis, crystal structures, sensing and photocatalytic properties

“…[28,29] SHELXT-2014 was applied to solve the structures, which were further refined by SHELXL-2018 with full-matrix least-squares based on F 2. [30,31] Crystallographic data and parameters of 1 and 2 are sorted into Table 1 and a significant portion of bond lengths and angles are listed in Table 2.…”

Syntheses, Structures, and Photoluminescence of Lanthanide Coordination Polymers Based on 4‐Oxo‐1,4‐dihydro‐2,6‐pyridinedicarboxylic acid

“…have been synthesized and characterized although reports of lanthanide clusters are limited. Though there are appropriate ligands and metal ions to obtain coordination polymers, it is still a great challenge to predict the final structure, depending on reaction conditions in the self‐assembly , …”

“…Though there are appropriate ligands and metal ions to obtain coordination polymers, it is still a great challenge to predict the final structure, depending on reaction conditions in the self-assembly. [19,20] Lately, we have been investigating 4-oxo-1,4-dihydro-2,6pyridinedicarboxylic acid (H 2 CDA) as a directed ligand. Considering a rigid 120°angle between the central pyridine ring synthesized and characterized.…”

Synthesis, Crystal Structure and Luminescent Properties of 2D Zinc Coordination Polymers Based on Bis(1,2,4-triazol-1-yl)methane and 1,3-Bis(1,2,4-triazol-1-yl)propane

“…Metal-organic frameworks based on tdc 2− donors demonstrating potential photocatalytic [19,20] and magnetic [21] applications were also reported. Bitopic heterocyclic ligands based on semi-rigid di(1,2,4-triazol-1-yl) derivatives [22] or flexible bis(imidazol-1-yl)alkanes [19,[23][24][25][26][27][28] are usually used in combination with tdc 2− and metal ions to build coordination networks. Despite a very large number of reported bis(imidazol-1-yl)alkane-linked frameworks based on H 2 tdc, no examples of coordination polymers with structurally similar bis(1,2,4-triazol-1-yl)alkanes have been prepared so far.…”