The emission spectrum of Zn(DIQ)₂ with DIQ=5,7-diiodo-8-quinolinolate consists of an intraligand (IL) fluorescence at λ_max=550 nm and a rather weak IL phosphorescence at λ_max=804 nm. While the appearance of the phosphorescence under ambient conditions is certainly caused by the heavy atom effect of the iodine substituents their influence is smaller than might be expected.

中文翻译：

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溶液中5,7-二碘-8-喹啉锌（II）的光学性质。环境条件下的磷光

锌（DIQ）的发射光谱₂与DIQ = 5,7-二碘-8-羟基喹啉包括在intraligand（IL）的荧光的λ_最大= 550nm和在一个相当弱的IL磷光λ_最大= 804纳米。尽管在环境条件下磷光的出现肯定是由碘取代基的重原子效应引起的，但它们的影响小于预期的影响。