一种新型酰腙配体及其Sn配合物的荧光特性研究

用稳态荧光和时间分辨荧光研究了一种新型酰腙配体2-羟基甲醛-5-氯水杨酰腙(H3L)及Sn配合物(n-Bu2)Sn(HL)晶体、溶液和旋涂膜的光谱特性与分子结构的关系。实验结果表明,对H3L而言,与其稀溶液相比,晶体及旋涂膜的荧光强度依次增强,荧光峰位都有所红移,荧光寿命有所延长,其单分子跃迁能为240.2kJ.mol-1;对(n-Bu2)Sn(HL)]而言,其晶体稳态荧光强度比在溶液中强且荧光峰位红移,旋涂膜产生了荧光猝灭,单分子跃迁能为230.4kJ.mol-1;与H3L相比较,(n-Bu2)Sn(HL)晶体的荧光强度要强接近4倍,荧光寿命变长。这些现象的物理机制是分子的共轭体系越大、分子的刚性越大其荧光强度越强,荧光寿命越长。

Studies on fluorescence properties of a novel acylhydrazone ligands and its Sn metal complexes

The molecular structure and spectral properties of a novel acylhydrazone ligands 2-hydroxy-naphthaldehyde-5-chloro-salicyloylhydrazone (H3L) and its Sn metal complexes (n-Bu2)Sn(HL)] in solution, crystal and thin films were investigated by using steady state and time resolved fluorescence spectrum. The experimental results show that for H3L, compared with it in solution, the fluorescence intensity is enhanced as it is crystal and thin films, the fluorescence peak is red-shift, and the excited state lifetime is longer. The transition energies of the unimolecule is 240.2 kJ x mol(-1). For (n-Bu2)Sn(HL), the fluorescence intensity is stronger as it is crystal than it is in solution and the fluorescence peak is red-shilft, the excited state lifetime is longer. The fluorescence is quenched as it is in thin films. The transition energies of the unimolecule is 230.4 kJ x mol(-1). The fluorescence intensity of (n-Bu2)Sn(HL) is four times higher than the H3L. The excited state lifetime of (n-Bu2) Sn(HL) is longer than H2L too. In theory, these phenomena could be explained by that with the increase of the conjugated system and the rigid construction, the fluorescence intensity is stronger and the excited state lifetime is longer.