Neodymium ternary complexes with 2,4,6-tri(2-pyridyl)-1,3,5-triazine: Synthesis, crystal structure and fluorescence property

Add time:08/16/2019    Source:sciencedirect.com

Two neodymium β-diketonates metal-organic complexes, Nd(TTA)3TPTZ (1) and Nd(BFA)3TPTZ (2), have been synthesized by using two β-diketone ligands 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione (HTTA) and 4,4,4-trifluoro-1-phenyl-1,3-butanedione (HFBA), and a macrocyclic conjugate ligand, 2,4,6-tri(2-pyridyl)-1,3,5-triazine (TPTZ). The crystal structures of these two complexes were determined by single crystal X-ray diffraction. The X-ray diffraction analysis showed that each neodymium ion in the two complexes formed a Nine-Coordinated structure with six oxygen atoms of HTTA (or HBFA) ligands and three nitrogen atoms of TPTZ ligand by the characteristic of triclinic with P1(—) space group both. In the crystal structure of the two complexes, a very obvious aromatic donor-acceptor interaction can be observed between adjacent TPTZ ligand molecules, which play an important role in the formation of three-dimensional structures. The complexes were also characterized by infrared spectroscopy, elemental analysis, thermogravimetric and fluorescence spectra. Fluorescence analysis showed that the two complexes exhibited characteristic neodymium-centered emission due to the significant antenna effect of these ligands.

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