Design and Synthesis of Pentadentate N3O2-Type Donor Schiff Bases and their Interactive Behavior with UO2(VI) Ion: An Instance of Strange Behavior of Pyridine in a Uranyl (UO22+) Complex

Publication Name

Journal of Chemical Crystallography


Mononuclear uranyl(VI) Schiff base complexes of formula [UO2(L1)]·py (1·py) {[UO2(L2)]}2·MeCN·H2O (2·MeCN·H2O) have been prepared and characterized by both IR and 1H NMR spectroscopy and X-ray crystallography. The complex species 1·py crystallizes as orange needle-like crystals in the orthorhombic space group, Pbca, with 8 molecules per unit cell. Interestingly, the pyridine molecule does not participate in coordination to the metal center and was found as a solvent molecule embedded in the crystal structure with weaker interactions to the metal complex. The crystals of the complex species, 2·MeCN·H2O, crystallized in a monoclinic form, space group, P21, with 2 molecules in the asymmetric unit. The two molecules [(UO2)(L2)(CH3CN or H2O)] in the asymmetric unit of 2·MeCN·H2O exhibit a competitive (CH3CN/H2O) scenario without any direct coordination to the uranyl ion. Graphical Abstract: Uranyl(VI) Schiff base complexes of general formula [UO2(L1)]·py (1·py) and {[UO2(L2)]}2·MeCN·H2O (2·MeCN·H2O) have been prepared and characterized by spectroscopic analysis and X-ray crystallography. [Figure not available: see fulltext.]

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