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In this work a flexible multi-dentate 1-(4-aminobenzyl)-1,2,4-triazole (abtz) ligand has been employed, two novel triazole-Cu(II) coordination polymers {[Cu(abtz) 2 (Br) 2 ]·(H 2 O) 2 } n ( 1 ) and {[Cu(abtz) 2 ]·(SiF 6 )·(H 2 O) 2 } n ( 2 ) have been isolated under solvo-thermal conditions. 1 is a 2D neutral Cu II coordination polymer while 2 is 2D cation micro-porous Cu II coordination polymer with the channel dimensionalities of 11.852(1) Å × 11.852(1) Å (metal-metal distances). Variable-temperature magnetic susceptibility data of 1 and 2 have been recorded in the 2–300 K temperature range indicating weak anti-ferromagnetic interactions. Further absorption properties of anion pollutants for 2 also have been investigated. 2 presents the novel example of cationic triazole-copper(II) coordination framework for effectively capturing anion pollutants Cr 2 O 7 2− in the water solutions and selectively capturing Congo Red in the methanol solutions. [ABSTRACT FROM AUTHOR]

The reaction of 2,5-bis(2-pyridyl)-1,3,4-oxadiazole (L1) with Cu(OAc)2·H2O salt in a CH3OH/CH3CN medium produces a new monometallic copper(II) complex 1 [Cu(L4)(OAc)(H2O)](H2O)2(CH3CN), where HL4=N-(α-hydroxyl-2-pyridyl)-N′-(α-methoxy-2-pyridyl)ketazine (C13H12N4O2), which was characterized by IR, UV–vis and elemental analysis, and established by X-ray diffraction technique. The results reveal that metal-assisted alcoholysis of L1 leads to the open of the central oxadiazole ring to give a new ligand HL4 during this course. In the crystal structure of complex 1, L4 acts as a tridentate chelating anionic ligand to coordinate to the CuII center, which lies in a square-pyramid coordination environment. Additionally, hydrogen-bonding interactions also play an important role in the self-assembly process. The mechanism of the metal-assisted alcoholysis of L1 in formation of complex 1 was discussed in detail and the spectral properties of 1 were also investigated. [Copyright &y& Elsevier]

Cobalt(II) and copper(II) complexes with deprotonated N-[2'-(4-methyl)pyrimidinyl]-2-nitrobenzenesulfonylurea were synthesized and their structures were characterized by IR spectrum, elemental analysis and X-ray diffraction. The deprotonated sulfonylurea is a bidentate ligand to Co(II) or Cu(II) in octahedral geometry. In the packing diagrams of the complexes, C-H ··· O hydrogen bonds are observed. The UV and fluorescence spectra of the complexes are described, and the thermogravimetric analyses of the complexes were performed. [ABSTRACT FROM AUTHOR]