A series of novel 6-oxo-1,6-dihydro-[2,2'-bipyridine]-5-carbonitriles has been synthesized and characterized. Their photophysical properties in DMSO solution and aqueous medium as well as fluorescence response to the presence of metal ions have been investigated. The obtained 4-(4-methoxyphenyl)-6-oxo-1,6-dihydro-[2,2'-bipyridine]-5-carbonitrile has been shown as a selective fluorescent “turn-ON” probe for Cd²⁺ ions with LoD 0.359 µM, 1:1 metal–ligand ratio and binding constant of 5.2 × 10⁴ M⁻¹.

中文翻译：

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新型氰基取代2,2'-联吡啶衍生物的合成及化学感应性质

合成并表征了一系列新型6-氧代-1,6-二氢-[2,2'-联吡啶]-5-腈。研究了它们在 DMSO 溶液和水性介质中的光物理性质以及对金属离子存在的荧光响应。^{获得的 4-(4-甲氧基苯基)-6-氧代-1,6-二氢-[2,2'-联吡啶]-5-甲腈已显示为 Cd 2+}离子的选择性荧光“开启”探针LoD 0.359 µM，1:1 金属配体比和 5.2 × 10 ⁴  M ^-1的结合常数。