Emmanuel N. Nfor

Copper(II) malonate coordination frameworks with amino-1,2,4-triazole: Crystal structures and magnetic properties of [Cu2(mal)2(datz)2(H2O)]·5H2O and [Cu2(mal)2(atz)2(H2O)]·3H2O

Two new malonato-bridged copper(II) complexes of the composition [Cu2(mal)2(datz)2(H2O)]·5H2O (1) and [Cu2(mal)2(atz)2(H2O)]·3H2O (2) (mal = malonate, atz = 4-amino-1,2,4-triazole, datz = 3,5-diamino-1,2,4-triazole) are prepared and characterized by X-ray crystal structure determination and magnetic studies. The environment of each copper atom in 1 and 2 has distorted square pyramidal and octahedral geometries. The intrachain copper-copper separation is 6.305 Å and 3.640 Å across the carboxylates and trizolates bridges respectively for complexes 1 and 2. The magnetic properties of 1 and 2 are investigated in the temperature range 2–300 K. The overall antiferromagnetic behavior is observed in both cases.

Dynamic cobalt metal–organic framework and application

Metal-organic frameworks (MOFs) are an emerging class of crystalline materials made by connecting a metal ion or cluster to polytypic organic linkers. They have a wide range of potential applications in gas storage, catalysis, drug delivery, sensing, separation and magnetism. [1, 2] Flexible MOFs described as MOFs with structural transformability upon stimuli are of special interest in many fields. [2, 3] In this work, one dynamic MOF, {[Co(34pba)(34pbaH)(OH2)] (DMF)0.5(H2O)}n (A), where 34pba = 3-(4-pyridyl)benzoate and DMF= N,N-dimethylformamide, was synthesized using the solvothermal method. It was fully characterized using X-ray diffraction methods, infrared spectroscopy, elemental analysis and thermal methods. X-ray analysis reveals that A crystallizes in the triclinic system, space group P-1. Its structure has been elucidated and its applications as a chromophoric sensor for volatile organic solvents have been investigated.