Synthesis and study Co, Mn, Cu, Ni and UO2-ion coordination complexes with aliphatic dinitrones

A series of new 3-d metal and UO2-ion complexes based on glyoxal (L1) and glutaric (L2) dinitrones were synthesized. Compounds of the general formula MLCl2·xSolv (M = Co2+, Mn2+, Cu2+, Ni2+) were prepared by the reaction of the above mentioned ligands with the corresponding chloride salts in isopropanol or in an isopropanol–water solution. Each complex was studied by spectroscopic methods. The molecular structure of L1, CoL1Cl2·2H2O, and UO2L21(NO3)2 have been characterized by X-ray diffraction. In cobalt case the coordination polyhedron of the cobalt atom is formed by two oxygen atoms from two ligands, two oxygen atoms from water, and two chloride ions. The geometry of the coordination sphere is a significantly distorted octahedron. L1 coordinates in a bridging, bidentate manner, forming a 1D coordination polymer. While in the uranyl-complex, one nitrone group of L1 is coordinated to the uranyl atom; the other remains free.

Graphical abstractA series of new 3-d metal and UO2-ion complexes based on glyoxal (L1) and glutaric (L2) dinitrones were synthesized. Each complex was studied by spectroscopic methods. The molecular structure of L1, CoL1Cl2·2H2O, and UO2L21(NO3)2 have been studied by X-ray diffraction. In case of cobalt complex L1 coordinates in a bridging, bidentate manner, forming a 1D coordination polymer. Whereas in uranyl-complex, one nitrone group of L1 is coordinated to the uranyl atom; the other remains free.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Glyoxal and glutaric dinitrones as ligands in complexes with 3-d metal and UO2-ion. ► Glyoxal dinitrone with Co coordinates in a bridging, bidentate manner, forming a 1D coordination polymer. ► In uranyl-complex glyoxal dinitrone is coordinated monodentate.