首页|Synthesis, characterization, crystal structures and thermochemical properties of five lanthanide complexes with mononuclear and binuclear structures
Synthesis, characterization, crystal structures and thermochemical properties of five lanthanide complexes with mononuclear and binuclear structures
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NSTL
Elsevier
Five new lanthanide complexes were synthesized by two different experimental methods: two mononuclear complexes and three binuclear complexes. Their chemical formula is: [Gd(2-Cl-4-FBA)(3)(terpy)H2O]1.5H(2)O(1); [Dy(2-Cl-4-FBA)(3)(terpy)H2O].0.5H(2)O(2)) (2-Cl-4-FBA = 2-chloro-4-fluorobenzoate,terpy = 2,2':6',2 ''-terpyridine); [Ln(3,4-DFBA)(3)(5,5'-DM-2,2'-bipy)(H2O)](2)(Ln = Pr(3),Er(4);[Ln(3,4-DFBA)(3)(5,5'-DM-2,2'-bipy)](2)(Ln = Ho(5)) (3,4-DFBA = 3, 4-difluorobenzoate,5,5'-DM-2,2'-bipy = 5,5'-dimethyl-2,2'-bipyridine). A series of characterization and properties of the complexes were studied, such as elemental analysis, single crystal X-ray diffraction, thermogravimetric analysis, fluorescence properties and so on. The coordination number of complexes 1-2 is 9, showing a muffin geometry. The results show that complex 1-5 crystallized in the triclinic system and space group P(i)over bar . Complexes 1 and 2 are isostructural except for the number of free water molecules. Complexes 3-5 are binuclear molecules with different structures. Although the structures of the five complexes are different, they all form one and two-dimensional supramolecular structures along a chain and a plane. The thermal decomposition mechanism of complexes 1-5 was studied by synchronous thermal analyzer infrared spectroscopy (TG/DSC-FTIR). The results show that the coordination water, neutral ligand and acidic ligand are lost in turn when the complex undergoes thermal decomposition. And the three-dimensional infrared images of gas escaping during the thermogravimetric process were analyzed. In addition, the solid state fluorescence spectra of complex 2 was measured and the results showed that the characteristic fluorescence of Dy(III) ion was emitted.
NSTL
Elsevier
