A new dipyrromethane-based tetramide 1 has been designed and synthesized. It serves as potential chemosensor for fluorometric detection of hydrogenpyrophosphate (HP₂O₇³⁻; HPPi) in organic and semi-aqueous medium. In CH₃CN, the tetramide 1 shows strong excimer formation upon complexation with HPPi and results in a ratiometric change in fluorescence. Other anions did not bring such change. In aqueous CH₃CN, this is observed although the change is less pronounced. Hydrogen bonding of HPPi in the cleft pulls the pendant naphthalene to form the excimer. The complexation has been established by spectroscopic and theoretical studies. The tetramide 1 selectively senses HPPi in CH₃CN with binding constant and detection limit of 3.2×10³ M⁻¹ and 2.08×10⁻⁵ M, respectively.

中文翻译：

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基于二吡咯甲烷的受体用于焦磷酸氢的荧光传感

设计并合成了一种新的基于二吡咯甲烷的四酰胺1。它可作为潜在的化学传感器，用于有机和半水介质中焦磷酸氢盐 (HP ₂ O ₇ ³⁻ ; HPPi) 的荧光检测。在 CH ₃ CN 中，四酰胺1在与 HPPi 络合后显示出强烈的准分子形成，并导致荧光的比例变化。其他阴离子没有带来这样的变化。在 CH ₃ CN水溶液中，虽然变化不那么明显，但可以观察到这种情况。裂隙中 HPPi 的氢键会拉动悬垂的萘形成准分子。已经通过光谱和理论研究建立了络合。四酰胺1选择性地检测CH ₃ CN 中的HPPi ，结合常数和检测限分别为3.2×10 ³  M ^-1和2.08×10 ^-5  M。