Synthesis And Properties Of Ternary Complexes Of Terbium And Green Fluorescent Macromolecules

Rare earth elements possess luminescent, electric and magnetic properties due to their particular electron structure, and these properties can also be changed, modified and strengthened through interacting them with the ligands. So the research of the rare earth luminescent complexes is helpful to develop new rare earth function materials with particular properties.Fluorescence counter-imitated printing ink is a kind of special printing ink producing visible light under UV, so it can be used as counter-imitated material, and print various counter-imitated brands, securities, light identified system, bar code label, mail and RMB's invisible signs. Chemosynthesis rare earth complexes possess good luminescent properties and consistency; it is possible to develop new counter-imitated materials to apply them to the fluorescence printing ink resins. The main work is as follows:1. Through ligand selection and synthesis conditions optimisation, sixteen new ternary complexes of terbium with the first ligand of aromatic carboxylic acid (p-methylbenzoic acid, methoxybenzoic acid, m-chlorobenzoic acid, benzoic acid, p-hydroxylbenzoic acid, salicylic acid, p-aminobenzoic acid, sulfosalicylic acid) and the second ligand of acrylonitrile and undecenoic acid have been synthesized. Their molecular compositions and structures were characterized by FT-IR, UV spectroscopies, elemental analysis and EDTA titrimetric method. Their thermal properties were studied by thermal analysis instrument. The basic order of the thermal stability of terbium ternary complexes was Tb(SSA)(UA)·3H₂O < Tb(BA)₂(UA)·3H₂O < Tb(MCBA)₂(UA)₂·3H₂O < Tb(MBA)₂(UA)·3H₂O < Tb(PHBA)₂(UA)·3H₂O < Tb(PABA)₂(UA)·3H₂O < Tb(SA)₂(UA)·3H₂O < Tb(PMBA)₂(UA)·3H₂O. Their luminescent properties were investigated by means of fluorescence instrument, The results indicate that all the spectra of terbium ternary complexes are similar, and emit the characteristic green fluorescence of ⁵D₄—⁷F₆,⁵D₄—⁷F₅,⁵D₄—⁷F₄ of terbium ion. Among the terbium complexes of aromatic carboxylic acid and acrylonitrile, the ability order that the ligands transfer energy to the central terbium was methoxybenzoic acid > p-methylbenzoic acid > m-chlorobenzoic acid > sulfosalicylic acid > benzoic acid > p-hydroxylbenzoic acid > salicylic acid > p-aminobenzoic acid. While for the terbium complexes of aromatic carboxylic acid and the undecenoic acid, the ability order that the ligands transfer energy to the central terbium ion was p-methylbenzoic acid > sulfosalicylic acid >benzoic acid > 1,10-phenanthroline > thienyltrifluoroacetone > methoxybenzoic acid > p-hydroxylbenzoic acid > m-chlorobenzoic acid. Among the...