Departamento de Química Orgánica, Universidad de Murcia, Campus de Espinardo, 30100 Murcia, Spain.
Dalton Trans. 2012 Apr 21;41(15):4437-44. doi: 10.1039/c2dt12156e. Epub 2012 Feb 22.
A new chemosensor molecule 3 based on a ferrocene-imidazophenanthrophenazine dyad effectively recognizes Hg(2+) in an aqueous environment through three different channels. Upon recognition, an anodic shift of the ferrocene-ferrocenium oxidation potential (ΔE(1/2) = 240 mV) and a progressive red shift (Δλ = 17 nm) of the low energy band in its absorption spectrum is produced. The emission spectrum of 3 in an aqueous environment, CH(3)CN-EtOH-H(2)O (65:25:10), and conducted at pH = 7.4 (20 × 10(-3) M HEPES) (Φ = 0.003), is perturbed after addition of Hg(2+) cations and an intense and structureless red shift emission band at 494 nm (Δλ = 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 (1)H NMR data of the complex and the theoretical calculations suggest the proposed bridging coordination mode.
一种基于二茂铁-咪唑并苯并菲咯嗪偶联物的新型化学传感器分子 3 通过三种不同的通道在水相环境中有效识别 Hg(2+)。识别后，其吸收光谱中低能量带的铁-铁氧化还原电位（ΔE(1/2) = 240 mV）发生阳极位移，并且发生渐进的红移（Δλ = 17 nm）。在水相环境中，在 pH = 7.4（20 × 10(-3) M HEPES）（Φ = 0.003）下进行的 3 的发射光谱，在添加 Hg(2+)阳离子后受到干扰，并且在 494nm 处出现强烈的无定形的红移发射带（Δλ = 92nm），同时发射带的强度增加（CHEF = 77），量子产率（Φ = 0.054）增加了 18 倍。配合物的（1）H NMR 数据和理论计算表明了所提出的桥联配位模式。
