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

Two neodymium β -diketonates metal-organic complexes, Nd(TTA) 3 TPTZ ( 1 ) and Nd(BFA) 3 TPTZ ( 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 P 1 ( — ) $\text{P}1(—)$ 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.