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使用溶剂热法合成了三种具有不同分子对称性的三明治结构的铒酞菁,并用时间飞行质谱、元素分析、紫外-可见-近红外吸收谱和近红外光致发光谱对它们的结构和近红外光谱特性进行了表征.在酞菁铒[Er(Pc)2]的吸收谱中,可以明显看到其中位于318 nm附近的吸收带为B带,对应着酞菁配体的π-π*电子跃迁.位于667 nm附近的吸收带为Q带,也对应着酞菁配体的π-π*电子跃迁,1528 nm附近有一个强度非常弱的吸收,对应着三价铒离子4I15/2-4I13/2跃迁的吸收.在二苯甲酰基甲烷酞菁铒[Er(Pc)(DBM)]的吸收谱中,与Er(Pc)2的吸收谱类似,只是Q带红移了11 nm,达到672 nm,B带红移了24 nm,达到342 nm.值得注意的是:随着配合物分子结构不对称性的增加1530 nm附近的发射增强.这被认为是由于三价铒离子所处的配体场的不对称性的增加导致原本宇称禁阻的4f-4f跃迁几率增加,从而使1530 nm附近发射增强.1530 nm处的发光对应着三价铒离子4I15/24-I13/2跃迁.
Three kinds of erbium phthalocyanines with different molecular symmetries were synthesized by solvothermal method. Their structures and their structures were characterized by time-of-flight mass spectrometry, elemental analysis, UV-Vis-NIR and near-infrared photoluminescence The absorption band of Er (Pc) 2 phthalocyanine in the vicinity of 318 nm is B band, corresponding to π-π * of the phthalocyanine ligand The transition of the band near 667 nm is the Q band, which corresponds to the π-π * electron transition of the phthalocyanine ligand. A very weak absorption near 1528 nm corresponds to the trivalent erbium ion 4I15 / 2- The absorption spectrum of Er (Pc) 2 was similar to that of Er (Pc) 2 in the absorption spectrum of erbium dibenzoylmethane phthalocyanine except that Q band was red-shifted by 11 nm, Reached 672 nm, and band B redshifted 24 nm to 342 nm.It is worth noting that the emission near 1530 nm increases with the asymmetry of the molecular structure of the complex, which is believed to be due to the presence of trivalent erbium ions Of the asymmetric ligand field increases the probability of the 4f-4f transition, which was previously known as a forbidden block, to increase the emission near 1530 nm.153 The luminescence at 0 nm corresponds to the trivalent erbium ion 4I15 / 24-I13 / 2 transition.