对位取代苯甲酸铽配合物的合成及其荧光性质

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.

Terbium complexes with 4-substituted benzoic acid: synthesis and luminescence properties

Eight terbium complexes were synthesized with 4-tert-butylbenzoic acid(HL1),4-methylbenzoic acid(HL2),4-ethylbenzoic acid(HL3),benzoic acid(HL4),4-chlorobenzoic acid(HL5),4-bromobenzoic acid(HL6),4-cyanobenzoic acid(HL7) and 4-nitrobenzoic acid(HL8).The complexes were characterized by IR、DTA-TG and fluorescence spectrum in the solid state.The luminescence properties of the complexes were investigated.The results showed that all complexes emitted characteristic luminescence of Tb(Ⅲ) except the complex with HL8.But the luminescence intensities of the eight complexes have differences because of the different substitutional groups in the ligands.Besides,the lowest triplet state energies of the ligands are determined by the phosphorescence spectra at 77 K and the Gaussian calculations.And the reason was explained for the differences among the eight complexes’ luminescence intensities.Meanwhile,the linear relationship between Hammett constant σ and the lowest triplet state energies for the ligands is obtained.It explaine the the luminescence properties of the eight complexes further.