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Triclinic structural isomer of cerium(III)–picrate complexes with triethylene glycol

Two new isomers of [Ce(NO3)(Pic)(H2O)2(EO3)](Pic) complex (where EO3 = triethylene glycol and Pic = picrate anion) have been synthesized by one-pot reaction and structurally characterized. Both isomers, orange and yellow in color, respectively, have a triclinic P-1 crystal lattice with different unit cell dimension, and Ce(III) adopts a different coordination number. In orange isomer, the Pic anion is chelated to Ce(III) via phenolic and ortho-nitro oxygens in a bidentate mode, while in yellow isomer the Pic anion is chelated only monodentate through the phenolic oxygen. Coordination geometries can be described as a distorted bicapped square antiprism and a distorted tricapped trigonal prism for 1 and 2, respectively. Alcohol groups from EO3 form a 1-D chain with symmetry direction [1 0 0] through intermolecular O–H ··· O hydrogen bonding. Photoluminescence spectra of the complexes showed a broad band at 515–540 nm due to the 5d → 4f transition from the Ce(III) with electric dipole allowed.