Structural refinement and luminescent property of a novel europium(III) complex with a proton transfer compound containing 2,6-pyridinedicarboxylate and 2,6-pyridinediammonium ligands synthesized by ultrasonic method

• A novel complex (H5O2)(pydaH)2Eu(pydc)3⋅2H2O (1) is reported.
• Di-hydronium ion, H5O2+, exists in the crystal lattice of complex 1.
• Complex 1 shows a three-dimensional supramolecular framework.
• Complex 1 is held together by ion pairing, H-bonding and π–π stacking interactions.
• Complex 1 exhibits a red emission under ultraviolet light.

In this paper, we reports on the structure of europium(III) complex, in short (H5O2)(pydaH)2Eu(pydc)3⋅2H2O (pyda = 2,6-pyridinediamine, pydc = 2,6-pyridinedicarboxylate), obtained from europium(III) nitrate with a proton transfer compound containing 2,6-pyridinedicarboxylate and 2,6-pyridinediammonium by ultrasonic method. This complex was characterized by means of single-crystal X-ray diffraction, Rietveld refinement, elemental analysis, infrared spectroscopy, thermogravimetric analysis and fluorescence spectra. The X-ray crystal structure analysis reveals that the 3D networks of complex (H5O2)(pydaH)2Eu(pydc)3⋅2H2O are held together by ion pairing, H-bonding, and π–π stacking interactions. Moreover, the solid-state fluorescence spectra of complex exhibit a red emission under ultraviolet light.

A novel rare metal complex, (H5O2)(pydaH)2Eu(pydc)3⋅2H2O (pyda = 2,6-pyridinediamine, pydc = 2,6-pyridinedicarboxylate) was synthesized and characterized. The X-ray crystal analysis reveals that the 3D framework of the complex is held together by metal-ligand coordination, ion pairing, H-bonding, and π–π stacking interactions. The solid-state fluorescence spectra exhibit a red emission under ultraviolet light.Figure optionsDownload as PowerPoint slide