Synthesis and photophysical characterisation of luminescent zinc complexes with 5-substituted-8-hydroxyquinolines
作者:Mauro Ghedini、Massimo La Deda、Iolinda Aiello、Annarita Grisolia
DOI:10.1039/b202945f
日期:2002.8.29
New 5-substituted-8-hydroxyquinoline ligands HLn (1–3), in which the quinoline and the p-N,N-dimethylphenyl fragments are connected through the –NN– (1), –CHN– (2) or –CH2–NH– (3) group, were designed and synthesised. Their reaction with a Zn(II) salt gave the pertinent Zn(Ln)2 complexes (4–6). The compounds 1–4 and 6 are stable in solution and their photophysical properties were explored. Zinc complexes 4 and 6
are both luminescent (4, λem: 620 nm, Φ < 1 × 10−4; 6, λem: 475 nm, Φ
= 7 × 10−3), although the states responsible for the radiative deactivation processes were different: CT in nature for 4 and from a π–π* transition localised on the quinoline fragment for 6. The roles exerted by both the metal and bridge on the photophysical properties are discussed.
新设计的5-取代-8-羟基喹啉配体HLn(1-3),其中喹啉和p-N,N-二甲基苯基片段通过-NN-(1)、-CHN-(2)或-CH2-NH-(3)基团连接。它们与Zn(II)盐反应得到相应的Zn(Ln)2配合物(4-6)。化合物1-4和6在溶液中稳定,并探究了它们的光物理性质。锌配合物4和6均具有发光性(4,λem: 620 nm,Φ < 1 × 10−4;6,λem: 475 nm,Φ = 7 × 10−3),尽管负责辐射失活的态不同:4为CT本质,6为喹啉片段上的π-π*跃迁。讨论了金属和桥对光物理性质的影响。