A smart photosensitive fluorescent probe for sensing Co2+ in extremely alkaline aqueous solution

IF 4.6 2区化学 Q1 SPECTROSCOPY Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2025-03-31 DOI:10.1016/j.saa.2025.126159

Yiming Zhang , Yujie Wang , Ruilin Shi , Bingxuan Huang , Shaoyin Wei , Yuji Wang , Nao Xiao

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Abstract

A novel pH-, viscosity-, and photo-sensitive polymorphic fluorescence probe NHP for sensing Co²⁺ has been developed. The hydrazone-based NHP can be synthesized by only one step of reflux reaction and purified by washing with poor solvents. Three single crystals of NHP-1, NHP-2, and NHP-3 with different conformations were resolved. As a photo acid generator (PAG), the hydrogen atom on the imino group of the probe NHP can be shed with 365 nm ultraviolet (UV) light illumination or in alkaline conditions. Due to the above two conditions, the negatively charged ligand obtained after dehydrogenation of NHP can accelerate its chelation with Co²⁺. When irradiated with 365 nm UV light, the product (NHP₂-Co²⁺ (I)) of NHP chelating with Co²⁺ appears yellowish in aqueous solution. In a strong alkali aqueous solution, the chelate product (NHP₂-Co²⁺ (II)) of NHP and Co²⁺ showed bright blue-green fluorescence. The formed divalent Co(II) complex NHP₂-Co²⁺ can be oxidized to trivalent Co(III) complex NHP₃-Co³⁺, as confirmed by the resolution of single crystals of NHP₃-Co³⁺.

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一种智能光敏荧光探针，用于检测极碱性水溶液中的Co2+

一种新型的pH-，粘度-光敏多晶荧光探针NHP用于传感Co2+。基于腙的NHP只需要一步回流反应就可以合成，并用劣质溶剂洗涤纯化。对不同构象的NHP-1、NHP-2和NHP-3三个单晶进行了解析。作为光酸发生器（PAG），探针NHP的亚胺基上的氢原子可以在365 nm紫外光照射下或在碱性条件下脱落。由于上述两种情况，NHP脱氢后得到带负电荷的配体可以加速其与Co2+的螯合作用。在365 nm紫外光照射下，NHP与Co2+螯合的产物（NHP2-Co2+ (I)）在水溶液中呈淡黄色。在强碱水溶液中，NHP与Co2+的螯合产物NHP2-Co2+ (II)显示出明亮的蓝绿色荧光。形成的二价Co（II）配合物NHP2-Co2+可被氧化为三价Co（III）配合物NHP3-Co3+，由NHP3-Co3+单晶的分解证实。

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来源期刊

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 物理-光谱学

CiteScore

8.40

自引率

11.40%

发文量

1364

审稿时长

40 days

期刊介绍： Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (SAA) is an interdisciplinary journal which spans from basic to applied aspects of optical spectroscopy in chemistry, medicine, biology, and materials science. The journal publishes original scientific papers that feature high-quality spectroscopic data and analysis. From the broad range of optical spectroscopies, the emphasis is on electronic, vibrational or rotational spectra of molecules, rather than on spectroscopy based on magnetic moments. Criteria for publication in SAA are novelty, uniqueness, and outstanding quality. Routine applications of spectroscopic techniques and computational methods are not appropriate. Topics of particular interest of Spectrochimica Acta Part A include, but are not limited to: Spectroscopy and dynamics of bioanalytical, biomedical, environmental, and atmospheric sciences, Novel experimental techniques or instrumentation for molecular spectroscopy, Novel theoretical and computational methods, Novel applications in photochemistry and photobiology, Novel interpretational approaches as well as advances in data analysis based on electronic or vibrational spectroscopy.