A new chemosensor molecule 3 based on a ferroceneâimidazophenanthrophenazine dyad effectively recognizes Hg2+ in an aqueous environment through three different channels. Upon recognition, an anodic shift of the ferroceneâferrocenium oxidation potential (ÎE1/2 = 240 mV) and a progressive red shift (Îλ = 17 nm) of the low energy band in its absorption spectrum is produced. The emission spectrum of 3 in an aqueous environment, CH3CNâEtOHâH2O (65â:â25â:â10), and conducted at pH = 7.4 (20 à 10â3 M HEPES) (Φ = 0.003), is perturbed after addition of Hg2+ cations and an intense and structureless red shift emission band at 494 nm (Îλ = 92 nm) appeared along with an increase of the intensity of the emission band (CHEF = 77), the quantum yield (Φ = 0.054) resulted in a 18-fold increase. The combined 1H NMR data of the complex and the theoretical calculations suggest the proposed bridging coordination mode.
一种新的
化学传感器分子 3 基于
二茂铁咪唑吩吩
蒽嗪二元化合物,通过三种不同的途径有效识别
水环境中的 Hg2+。识别后,
二茂铁的氧化电位会发生阳移(δE1/2 = 240 mV),其吸收光谱中的低能段会发生渐进的红移(δ" = 17 nm)。3 在
水环境 CH3CNâEtOHâ
H2O (65â:â25â:â10) 中的发射光谱在 pH = 7.4 (20 Ã 10â3 M
HEPES) 条件下进行(δ = 0.在加入 Hg2+ 阳离子后,494 nm(δ" = 92 nm)处的无结构红移发射带受到扰动,同时发射带强度(CHEF = 77)增加,量子产率(δ = 0.054)增加了 18 倍。该复合物的 1H NMR 数据和理论计算相结合,表明了所提出的桥接配位模式。