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The mixed-ligand copper(II) iminodiacetates [Cu(ida)(2-mim)(H 2 O) 2 ]·H 2 O ( 1 ), [Cu(ida)(2-mim) 2 ]·2H 2 O ( 2 ), [Cu(ida)(2-mim)(H 2 O)] n ·4.5nH 2 O ( 3 ), and [Cu 2 (ida) 2 (2-mim) 2 ] n ·nH 2 O ( 4 ) (H 2 ida = iminodiacetic acid, 2-mim = 2-methylimidazole) were obtained from neutral or alkaline solutions at different temperatures. The novel complex 4 contains very small holes with diameters of 2.9 Å, which can adsorb O 2 selectively and reversibly between 1.89 to 29.90 bars, compared with the different gases of N 2 , H 2 , CO 2 , and CH 4 . This complex is stable up to 150 °C based on thermal analyses and XRD patterns. The four complexes show catalytic activities that facilitate the conversion of cyclohexane to cyclohexanol and cyclohexanone with hydrogen peroxide in a solution. The total conversion is 31% for 4 .

2-Methylimidazole Copper Iminodiacetates for the Adsorption of Oxygen and Catalytic Oxidation of Cyclohexane