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We present a detailed analysis of the magnetic properties of two Cu(II) coordination compounds with the tetrazole-1-acetate ligand (t1a), previously reported in literature by Yu et al. [Q. Yu, X. Zhang, H. Bian, H. Liang, B. Zhao, S. Yan, D. Liao, Cryst. Growth Des. 8 (2008) 1140] and simultaneously synthesised independently by ourselves. We focus on methods of describing the susceptibility and magnetisation of a ferromagnetically-coupled S = 1/2 square network (2) and a tetranuclear S = 1/2 'butterfly' cluster (4) as well as discussion of the energy levels of such a cluster.
We have synthesized a new one-dimensional coordination polymer, [CuII(HL)2(4,4′-bpy)]n·2nH2O (1), (HL– = monodeprotonated 3-nitrophthalic acid, 4,4′-bpy = 4,4′-bipyridine) consisting of infinite chains of [CuII(HL)2(4,4′-bpy)]n and have investigated its structure and magnetic properties. Compound 1 crystallizes in the monoclinic C2/c space group with the [CuII(HL)2(4,4′-bpy)]n chains running parallel to the b axis. The chains are linked together by hydrogen bonding between the HL– groups and water molecules to form the three-dimensional crystal structure. The magnetic susceptibility of 1 can be well described using an antiferromagnetic S = 1/2 chain model with g = 2.11(1) and 2J = –0.61(1) cm–1. Several techniques for describing the susceptibility of S =1/2 chains are examined to compare their validity at lowvalues of kT/|2J|, includin...
Prussian blue (PB) nanoparticles, one of many cyano-bridged coordination polymers, are successfully incorporated into chitosan (CS) polymer to prepare PB/CS mixed matrix membranes (MMMs). The PB nanoparticles are uniformly distributed in the MMMs without the collapse of the original PB structure. As-prepared PB/CS MMMs are used for ethanol dehydration at 25 degrees C in the pervaporation process. The effect of loading PB in CS matrix on pervaporation performance is carefully investigated. The PB/CS membrane with 30 wt% PB loading shows the best performance with a permeate flux of 614 g.m(-2).h(-1) and a separation factor of 1472. The pervaporation using our PB/CS membranes exhibits outstanding performance in comparison with the previously reported CS-based membranes and MMMs. Furthermore, the addition of PB allows PB/CS MMMs to b...
Despite much progress in the development of mixed matrix membranes (MMMs) for many advanced applications, the synthesis of MMMs without particle agglomeration or phase separation at high nanofiller loadings is still challenging. In this work, we synthesized nanoporous zeolitic imidazole framework (ZIF-8) nanoparticles with a particle size of 60nm and a pore size of 0.34nm in water and directly added them into an aqueous solution of the organic polymer poly(vinyl alcohol) (PVA) without an intermediate drying process. This approach led to a high-quality PVA/ZIF-8 MMM with enhanced performance in ethanol dehydration by pervaporation. The permeability of this MMM is three times higher than that of pristine PVA, and the separation factor is nearly nine times larger than that of pristine PVA. The significantly improved separation perfo...
Pt-Based mesoporous bimetallic alloy particles with low Co and Ni contents were synthesized successfully through a hard-templating method and show great potential as effective catalysts for methanol oxidation reactions.
A new two-dimensional microporous metal organic framework (MOP), Al-MOF, [Al(OH)(MBA)] (CYCU-7, MBA = diphenylmethane-4,4'-dicarboxylate anion) and its reported analogue, [Al(OH)(SBA)] (CAU-11, SBA = 4,4'-sulfonyldibenzoate anion), have been synthesized using hydrothermal and solvothermal methods, respectively, and their structural crystallinities and defect porosities were carefully controlled and characterized by N-2 sorption isotherms and Al-27 solid-state nuclear magnetic resonance measurements. Interestingly, the MOF synthesized by the ethanol-based solvothermal method (CYCU-7) show a significant degree of linker-missing defects compared to that synthesized by the water-based hydrothermal method (CAU-11). We further incorporated the synthesized CYCU-7 and CAU-11 with chitosan (CS) biopolymer to make CYCU-7@CS and CAU-11@CS m...
Iron pyrite has long been an attractive material for environmental and energy applications, but is hampered by a lack of control over morphology and purity. Hollow porous iron pyrite nanoparticles were synthesized by a direct sulfurization of iron oxide derived from Prussian blue. The high efficiencies of these hollow porous iron pyrite nanoparticles as effective dye-sensitized solar cell counter electrodes were demonstrated, with an efficiency of 7.31%.
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