Two Polymorphs of Cobalt(II) Imidazolate Polymers Synthesized Solvothermally by Using One Organic Template N,N-Dimethylacetamide

Abstract

Two structurally different polymorphs of cobalt(II) imidazolate frameworks are solvothermally synthesized by using N,N-dimethylacetamide as a template: The polymorph 6 (a = 9.797 (4) angstroms, b = 15.301(6) angstroms, c =14.902(6) angstroms, beta = 98.904(6) degrees, monoclinic, P21/n) shows structures of silicate CaAl2Si2O8 with CrB4 topology, while polymorph 7 (a = 15.173(4) angstroms, b = 15.173(4) angstroms, c = 19.089(5) angstroms, Pbca) shows CaGa2O4-related topological structures. In addition, the 7' (a = 15.9712(18) angstroms, b = 15.9253(19) angstroms, c = 18.475(2) angstroms, Pbca), a compound isostructural with 7, is synthesized by using cyclohexanol as a template. Thus, these cobalt(II) imidazolate polymers are reminiscent of the zeolite syntheses in that not only the same topological structure can be synthesized by using the different organic templates, but also different topological structures can be synthesized by using the same organic template.

Magnetic functionalities in MOFs: from the framework to the pore

“…7). [35][36][37] The robustness of the porous framework was nevertheless proven in one of these polymorphs by exchanging the included template with EtOH and removing it later by vacuum treatment. 35 Although imidazolates transmit the antiferromagnetic coupling between the Co II ions in these structures, the uncompensated antiferromagnetic couplings arising from the non-centrosymmetric structures have often led to the appearance of weak ferromagnets (also known as canted-antiferromagnets) as a consequence of spin-canting.…”

Two new d10 metal-directed coordination polymers based on an unsymmetrical ligand 3-pyrimidin-5-ylbenzoic acid

“…In recent years, the design and synthesis of coordination polymers (CPs) have attracted much attention not only for their intriguing variety of architectures but also for potential applications in catalysis [1], magnetism [2], fluorescence [3], nonlinear optics [4], ion exchange [5] and adsorption [6]. In the self-assembled process, the choice of organic ligands and metal ions plays an important role in the formation of metal-organic frameworks (MOFs).…”

“…While for the unsymmetric ligand with both aromatic carboxylate group and pyrimidine group, no compound has been reported except that two mononuclear coordination compounds based on this kind of unsymmetric ligand have been reported by us recently [15]. With the focus on understanding the construction and luminescent properties of the coordination polymers assembled by the 3-pyrimidin-5-ylbenzoic acid ligand with d 10 metal ions, we obtained two novel coordination polymers [Cd(3,5-PMBC) 2 Solvothermal treatment of asymmetric ligand 3,5-PMBC and Cd (NO 3 ) 2 ⋅ 4H 2 O affords a one-dimensional (1D) double-stranded chain coordination polymer of 1 [16]. Selected bond lengths and angles for 1 are listed in Table S1.…”

“…Two novel d 10 metal coordination polymers [Cd (3, 2 (3, 2 (H 2 O) 2 ]⋅2H 2 O} (2) (3,5-PMBC = 3-pyrimidin-5-ylbenzoic acid) have been synthesized under solvothermal conditions, and characterized by IR spectroscopy, powder and single crystal X-ray diffractions. In 1 and 2, the d 10 metal ions (Zn 2+ and Cd 2+ ) directed the self-assemblies to form two types of significantly different coordination structures: 1 exhibits one-dimensional double-stranded chain, while 2 displays a unique two-dimensional undulated double layer.…”

Synthesis, crystal structures and electrochemical properties of two new metal-centered ferrocene complexes

“…In addition, the organic-inorganic hybridized coordination complexes containing imidazole derivatives, which were designed based on topologies, have been frequently reported [20][21][22][23][24] . In our previous studies, we have successfully designed and synthesized a functional imidazole ligand, and obtained a series of organic-inorganic hybridized supramolecular polymers [25,26] , which are different from other reported imidazole-containing coordination polymers [27,28] .…”