Two new Ni^II and Zn^II metal–organic frameworks of glutarate and 1,4-bis[(2-methyl-1H-imidazol-1-yl)methyl]benzene ligands: syntheses, structures and luminescence sensing properties

Abstract

Two new metal-organic frameworks (MOFs), namely, three-dimensional poly[diaquabis{ 2 -1,4-bis [(2-methyl-1H-imidazol-1-yl)methyl]benzene}bis( 2 -glutarato)dinickel(II)] monohydrate], {[Ni 2 (C 5 H 6 O 4 ) 2 (C 16 H 18 N 4 ) 2 (H 2 O) 2 ]ÁH 2 O} n or {[Ni 2 (Glu) 2 (1,4-mbix) 2 (H 2 O) 2 ]ÁH 2 O} n , (I), and two-dimensional poly[[{ 2 -1,4bis[(2-methyl-1H-imidazol-1-yl)methyl]benzene}( 2 -glutarato)zinc(II)] tetrahydrate], {[Zn(C 5 H 6 O 4 )(C 16 H 18 N 4 )]Á4H 2 O} n or {[Zn (Glu)(1,4-mbix)]Á4H 2 O} n (II), have been synthesized hydrothermally using glutarate (Glu 2À ) mixed with 1,4bis[(2-methyl-1H-imidazol-1-yl)methyl]benzene (1,4-mbix), and characterized by single-crystal X-ray diffraction, IR and UV-Vis spectroscopy, powder X-ray diffraction, and thermogravimetric and photoluminescence analyses. Ni II MOF (I) shows a 4-connected 3D framework with point symbol 6 6 , but is not a typical dia network. Zn II MOF (II) displays a two-dimensional 4 4 -sql network with onedimensional water chains penetrating the grids along the c direction. The solidstate photoluminescence analysis of (II) was performed at room temperature and the MOF exhibits highly selective sensing toward Fe 3+ and Cr 2 O 7 2À ions in aqueous solution. research papers Acta Cryst. (2020). C76, 148-158 Zhao et al. Two Ni II and Zn II metal-organic frameworks 149 research papers Acta Cryst. (2020). C76, 148-158 Zhao et al. Two Ni II and Zn II metal-organic frameworks 157

Multifunctional Porous Coordination Polymers Synthesized by the Variation of Chain Length and Flexibility of Dicarboxylates and Size of the Metal Ions

“…It is confirmed by single-crystal X-ray analysis that both complexes 1 and 2 crystallize in the monoclinic P21/c space group. The single crystal study of complex 2 indicates that it has similar structural parameters as reported by Zhao et al 33 even after following a different synthetic pathway. The structural analysis clearly indicates the formation of a two-dimensional structure built up by the bridging of both glutarate and 1,4-(2-Me)-bix linkers with the Cd(II) and Zn(II) centers, respectively, for 1 and 2.…”

“…33 Complex 2 has been synthesized here following a different synthetic technique but have the same structure which has been confirmed by all physicochemical studies. 33 To examine the effect of substitution and the variation of chain length on the studied properties (electrical conductivity and gas adsorption), two dicarboxylates (glutarate and methyl succinate) having the same molecular weight but different chain length and substitutions have been chosen. It is quite obvious from the obtained data that this variation has retained a remarkable impact for measurement of the studied properties in this case.…”

“…To account for all these better possibilities, and to navigate the design principle above, three porous coordination polymers, namely, {[Cd­(1,4-(2-Me)-bix)­(glu)]·5­(H 2 O)} n ( 1 ), {[Cd 2 (1,4-(2-Me)-bix)­(msuc)]·(H 2 O)} n ( 3 ), and {[Zn­(1,4-(2-Me)-bix)­(msuc)]·(solvent) x } n ( 4 ) have been synthesized using an aromatic N-donor linker 1,4-bis­[(2-methyl-1-imidazolyl)-methyl]­benzene {1,4-(2-Me)-bix} along with two electron-rich metals, Zn­(II) and Cd­(II), and two dicarboxylates, disodium glutarate and disodium methyl succinate. To draw an understanding over the structure and property relationship, properties of a previously reported complex {[Zn­(1,4-(2-Me)-bix)­(glu)]·4­(H 2 O)} n ( 2 ) has also been discussed here . Complex 2 has been synthesized here following a different synthetic technique but have the same structure which has been confirmed by all physicochemical studies .…”

“…To draw an understanding over the structure and property relationship, properties of a previously reported complex {[Zn­(1,4-(2-Me)-bix)­(glu)]·4­(H 2 O)} n ( 2 ) has also been discussed here . Complex 2 has been synthesized here following a different synthetic technique but have the same structure which has been confirmed by all physicochemical studies . To examine the effect of substitution and the variation of chain length on the studied properties (electrical conductivity and gas adsorption), two dicarboxylates (glutarate and methyl succinate) having the same molecular weight but different chain length and substitutions have been chosen.…”