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分别合成了以对叔丁基苯甲酸(HL1)、对甲基苯甲酸(HL2)、对乙基苯甲酸(HL3)、苯甲酸(HL4)、对氯苯甲酸(HL5)、对溴苯甲酸(HL6)、对氰基苯甲酸(HL7)以及对硝基苯甲酸(HL8)为配体的8种铽的配合物,并通过红外光谱、荧光光谱以及热重-差热分析对其进行表征.结果表明,除HL8与Tb(Ⅲ)形成的配合物外,其它配合物均发出较强的铽(Ⅲ)的特征荧光,但是配体的差异即配体取代基不同,对配合物的荧光强度有较大的影响.此外,采用低温磷光光谱和高斯计算2种方法确定了配体三重态能级,解释和说明了各配合物荧光强度存在差异的原因,并且得到了配体三重态能级与取代基性质Hammett常数σ的线性关系,进一步地解释了该系列配合物的荧光性质.
The compounds were synthesized by the following methods respectively: HL1, HL2, HL3, HL4, p-bromobenzoic acid (HL6), p-cyanobenzoic acid (HL7) and p-nitrobenzoic acid (HL8) as ligands, and characterized by FTIR, FTIR and TG-DTA The results showed that all the complexes except for the complexes formed by Tb (Ⅲ) and HL8 emit strong characteristic fluorescence of terbium (Ⅲ), but the differences of ligands, that is, the ligand substituents, In addition, two kinds of methods were used to determine the triplet energy levels of the ligands by means of low-temperature phosphorescence spectroscopy and Gaussian calculation. The reasons for the difference in the fluorescence intensity of the complexes were explained and explained, and the triplet energy The linear relationship between the order and the Hammett constant σ of the substituent group further explains the fluorescence properties of the series of complexes.