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A new chromogenic and ratiometric agent for copper(II): Synthesis, structure and spectroscopy

机译:一种新型的生铜配色剂(II):合成,结构和光谱

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摘要

A heterocyclic hydrazone ligand, pyridine-2-carboxaldehyde-2-hydrazino-2- imidazoline hydrobromide, HL (1), was investigated as a new chromogenic and ratiometric agent for selective detection of Cu~(2+). The ligand 1 gives a characteristic absorption peak in the UV region (λ_(max) = 328 nm). It interacts selectively with Cu~(2+) and addition of Cu ~(2+) shifted the UV absorption wavelength from 328 to 410 nm due to formation of the complex [CuBr_2(HL)] (1a). The red-shift of the absorption spectrum allowed a ratiometric analysis of the signalling behavior. The formation of 1a was accompanied by a color change from light yellow to bright green, which can easily be distinguished from other metal complexes by the naked eye. The association constant (K_(ass), UV-Vis) of 1a was found to be (5.58 ± 0.006) × 10~4 at 298 K. The molecular structures of 1 and 1a have been successfully determined by single crystal X-ray diffraction studies.
机译:研究了一种杂环配体吡啶-2-羧醛-2-肼基-2-咪唑啉氢溴酸盐HL(1),作为一种选择性检测Cu〜(2+)的生色剂和配比剂。配体1在UV区域(λ_(max)= 328nm)给出特征吸收峰。它与Cu〜(2+)选择性地相互作用,并且由于形成了[CuBr_2(HL)](1a),Cu〜(2+)的添加使UV吸收波长从328 nm移至410 nm。吸收光谱的红移允许对信号行为进行比例分析。 1a的形成伴随着从浅黄色到亮绿色的颜色变化,用肉眼可以容易地将其与其他金属配合物区分开。发现在298 K时1a的缔合常数(K_(ass),UV-Vis)为(5.58±0.006)×10〜4。通过单晶X射线衍射已成功确定1和1a的分子结构学习。

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