Developing a magnetic metal organic framework of copper bearing a mixed azido/butane-1,4-dicarboxylate bridge: magnetic and gas adsorption properties

Abstract

A magnetic metal organic framework {[Cu(but-1,4-dc)0.5(N3)(H2O)]·H2O}n (MFUM-1(Cu)) (but-1,4-dc = butane-1,4-dicarboxylate) was synthesized and characterized structurally and magnetically. In MFUM-1(Cu), each CuII ion has a distorted octahedral geometry with an obvious Jahn-Teller distortion, where the coordination environment is composed of mixed EO-azido/aliphatic based carboxylate/H2O threefold bridges. These bridges extend the structure of MFUM-1(Cu) in two dimensions by covalent connectivity and form square-shaped channels. Also, a study was done to determine the effectiveness of sonochemical synthesis for the preparation of nano-sheets of MFUM-1(Cu) and subsequently the influence of particle size on physical properties such as magnetic behavior and thermal stability. The particles were characterized by elemental analyses, infrared spectroscopy (IR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and powder X-ray diffraction (PXRD) analyses. The effects of parameters such as concentration, solvent, and reaction time on the size distribution, morphology, and yield of product were carefully studied. The magnetic properties of MFUM-1(Cu) and corresponding nano-structure were examined which indicated metamagnetism with strong intrachain ferromagnetic coupling versus the weak interchain antiferromagnetic coupling. Finally, the application of MFUM-1(Cu) in the separation of carbon dioxide from nitrogen and also from methane was theoretically investigated. High calculated selectivity of CO2 over N2 and CH4 reveals the potential application of MFUM-1(Cu) in practical systems of gas separation.

Power of Infrared and Raman Spectroscopies to Characterize Metal-Organic Frameworks and Investigate Their Interaction with Guest Molecules

“…164 cm –1 ) . Conclusions based on the split value have been drawn for highly asymmetric chelating mode or bidentate bonding mode of carboxylates.…”

“…At the same time acetates in the structure acted as bidentate chelating ligands (111 vs. 164 cm −1 ). 80 Conclusions based on the split value have been drawn for highly asymmetric chelating mode 81 or bidentate bonding mode 82 of carboxylates.…”

Structure, magnetic properties and spin density of two alternative Mn(ii) coordination polymers based on 1,4-bis(2′-carboxyphenoxy)benzene

“…3, Mode I), in which α and β correspond to the dihedral angles between rings A/B and A/A i (i = −x + 1, −y, −z + 1), respectively. The values of α and β are 68.82 (11)°and 0°. On the other hand, four Mn(II) ions are connected by a bcpb 2− in µ 4 -η 2 :η 2 -O 4 :O 4 -coordination mode (Fig.…”

“…Coordination polymers formed by metal cations and bridging ligands have attracted much attention. [1][2][3][4][5][6] Design and construction of coordination polymers (CPs) are currently of great interest in the fields of coordination chemistry and crystal engineering because the target materials display an intriguing variety of topologies, fascinating structures, interesting properties and potential applications, such as separation, catalysis, ion exchange, magnetism, luminescence and nonlinear optics; [7][8][9][10][11][12][13] this enumeration might well be expanded.…”

Adsorbents for Noxious Gas Sequestration: State of the Art

“…MIL-140 [41] and UTSA-120a [46] showed one of the highest selectivity of 1900 and ~600 for CO 2 in binary mixtures (CO 2 /N 2 ). Extremely high selectivity of 7531 for CO 2 /N 2 binary mixture was recorded for MOF MFUM-1(Cu) [139] without information on its adsorption capacity. MOFs 1-dmen [136] and 1-ipen [136] have also been reported to exhibit selectivities of 554 and 273, respectively.…”