Four 3D Cd(II)-Based Metal Organic Hybrids with Different N,N′-Donor Spacers: Syntheses, Characterizations, and Selective Gas Adsorption Properties

Abstract

Four new metal organic frameworks with bivalent cadmium, disodium succinate (Na2suc), and four different N,N′-donor ligands, i.e., {[Cd(L1)(suc)]­·(H2O)3} n (1), {[Cd(L2)(suc)]­·(H2O)2} n (2), {[Cd(L3)(suc)]­·(H2O)4} n (3), {[Cd3(L4)3(suc)2(H2O)2]­·(NO3)2 (H2O)4} n (4) [L1 = 2,5-bis-(4-pyridyl)-3,4-diaza-2,4-hexadiene, L2 = trans 4,4′-azobispyridine, L3 = 2,5-bis-(3-pyridyl)-3,4-diaza-2,4-hexadiene, L4 = 1, 2-bis(4-pyridyl) ethane and suc = succinate dianion] have been synthesized at room temperature and characterized by single-crystal X-ray diffraction and other physicochemical methods. Structure determination reveals that compounds 1 and 2 show honeycomb-like three-dimensional (3D) architecture with water-filled channels. The dehydrated frameworks of 1 and 2 exhibit hydrogen and carbon dioxide adsorption properties. In compound 3, change of linker (linear to bent) led to the blockage of such regular channels which also affected the porosity and adsorption properties of its dehydrated framework. In 4, the used spacer is linear but the resulting 3D framework contains blocked channels filled with nitrate (NO3 –) anions and lattice water.

Coordination Polymers Comprised of an Exo Bifunctional Schiff Base Ligand and Succinate Dianion: Critical Analysis of Factors Affecting the Structures and Framework Dimensionality

“… Coordination environment around Cd(II) in (a) CP2 (Structure generated from CCDC 1426874) and (b) CP3 (Structure generated from CCDC 930300)…”

“…In contrast, in 2013, Bhattacharya et al . synthesized a 3D CP, CP3 , {[Cd( L1b )(C 4 H 4 O 4 )]⋅(H 2 O) 4 } n , with Cd(NO 3 ) 2 using this ligand in combination with disodium succinate and in 2015 synthesized another 3D CP, CP2 , {[Cd( L1b )( C 4 H 4 O 4 )(H 2 O)]⋅3(H 2 O)} n with Cd(ClO 4 ) 2 and L1b in combination with disodium succinate (Scheme ). Thus it was important to analyze the structural features of the Cd(II) CPs of L1b and succinate with a focus on the following points:…”

P–C Bond Cleavage-Assisted Lanthanide Phosphate Coordination Polymers

“…[18][19][20][21][22] In contrast to molecular complexes, coordination polymers containing lanthanide ions have been much less studied. [23][24][25][26][27][28] This is surprising in view of the considerable interest in transition metal ioncontaining coordination polymers in general, [29][30][31] and metal-organic frame works (MOFs) in particular. The utility of dicarboxylate ligands in MOFs has also resulted in their use in lanthanide chemistry in the assembly of coordination polymers.…”

Temperature dependent structural variation from 2D supramolecular network to 3D interpenetrated metal–organic framework: In situ cleavage of S–S and C–S bonds

“…Considerable progress has also been made in the construction of functional MOFs by using various bipyridyl spacers along with carboxylate ligands [30,31]. The bipyridyl spacers not only pillar the metal-carboxylate motifs into higher dimensionality but also support diverse structural topologies.…”