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Luminescence Detection of Ag+ and Phosphate Ions by a Ruthenium(II) Complex-Based Multianalyte Probe: A Combined Spectroscopic, Crystallographic, and Theoretical Approach
European Journal of Inorganic Chemistry ( IF 2.2 ) Pub Date : 2021-08-20 , DOI: 10.1002/ejic.202100293
Bhaskar Sen 1 , Sumit K. Patra 1 , Monosh Rabha 1 , Sanjoy K. Sheet 1 , Kripamoy Aguan 2 , Debabrata Samanta 3 , Snehadrinarayan Khatua 4
Affiliation  

A bis-heteroleptic Ru(II) complex, 1[PF6]2, of substituted pyridyl-1,2,3-triazole ligand (L1) has been developed for the photoluminescence(PL) detection of phosphate (HP2O73−/PPi) and Ag+ ion in distilled CH3CN and mixed aqueous buffer (carbonate-bicarbonate buffer/CH3CN; v/v, 9.5 : 0.5; 0.1 M; pH 10.6) at two different wavelengths, respectively. The multianalyte probe, 1[PF6]2 showed significant PL enhancement in the presence of H2PO4, PPi, and Ag+ with low detection limits of 0.48 μM, 0.43 μM, and 0.46 μM, respectively. The PL enhancement with phosphate ions is due to the triazole C−H⋅⋅⋅anion H-bonding interaction that has been supported by 1H NMR titration (for PPi) and single-crystal X-ray structure (for H2PO4). A unique Ag(I)-triazolide complex formation is responsible for the PL enhancement in Ag+ ion detection. Triplet state TDDFT calculations were carried out to explain the PL enhancement of 1 ⋅ PPi and 1-Ag adducts. In 1-Ag, the L1 ligand becomes a better σ-donor as well as π-donor. Consequently, the 3MLCT-3MC energy gap is increased and the 1-Ag emits efficiently from the 3MLCT state. The probe also shows low cytotoxicity against Hela cells and is used for intracellular Ag+ imaging.

中文翻译:

基于钌 (II) 络合物的多分析物探针对 Ag+ 和磷酸盐离子的发光检测:一种组合光谱、晶体学和理论方法

已开发出取代吡啶基-1,2,3-三唑配体 ( L1 )的杂配 Ru(II) 配合物1[PF 6 ] 2用于磷酸盐 (HP 2 O 7 3 ) 的光致发光 (PL) 检测- /PPi) 和 Ag +离子在蒸馏的 CH 3 CN 和混合水性缓冲液(碳酸盐-碳酸氢盐缓冲液/CH 3 CN;v/v,9.5 : 0.5;0.1 M;pH 10.6)中分别在两种不同的波长下。多分析物探针1[PF 6 ] 2在 H 2 PO 4 -、PPi 和 Ag存在下显示出显着的 PL​​ 增强+检测限分别为 0.48 μM、0.43 μM 和 0.46 μM。磷酸根离子的 PL 增强归因于三唑 C−H⋅⋅⋅ 阴离子 H 键相互作用,该相互作用已得到1 H NMR 滴定(对于 PPi)和单晶 X 射线结构(对于 H 2 PO 4 -)的支持)。独特的 Ag(I)-三唑化物复合物形成是 Ag +离子检测中PL 增强的原因。进行三重态 TDDFT 计算以解释1  ⋅ PPi 和1 -Ag 加合物的 PL 增强。在1 -Ag 中,L1配体成为更好的σ -供体以及π-捐赠者。因此,3 MLCT- 3 MC 能隙增加并且1 -Ag 从3 MLCT 状态有效地发射。该探针还显示出对 Hela 细胞的低细胞毒性,可用于细胞内 Ag +成像。
更新日期:2021-09-15
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