Based on the weak interaction between molecules, the construction of a new anionic photochemical sensor is a research hotspot in the field of molecular recognition chemistry. On the basis of systematically summarizing the research status and progress of anion photochemical sensor, this paper develops a new kind of anion photochemical sensor based on pyrrole NH.

And phenol OH

Study on colorimetric sensing of fluoroboron fluorescence sensor with anion recognition site and simple indole receptor. The interaction between receptor molecules and biologically related important anions was studied by various spectral methods, and the interaction mode and mechanism between receptor and guest anions were established and clarified. The main research contents of this paper are as follows:

1.

A series of fluoroboron fluorescent receptors and simple indole colorimetric receptors were designed and synthesized, and the structures of the compounds were studied by1h.

Nuclear magnetic resonance,

13C

Nuclear magnetic resonance,

IR，

Electrospray mass spectrometry

And elemental analysis.

2.

The photochemical sensing effect of pyrrole-fluoroboron fluorescent receptor with anions and the cationic effect of steric effects and alkyl ammonium salt of substituents in the recognition process were systematically studied. The results show that the introduction of fluorine and boron fluorescent groups into pyrrole skeleton obviously improves the macro signal expression in the process of anion recognition. Based on multiple hydrogen bonds, F-

Colorimetric and fluorescence dual-channel identification. Bicalix pyrrole units can form a "sandwich" complex with anions, which significantly enhances the binding ability of receptors with anions.

3.

The photochemical sensing effect of phenol-fluoroboron fluorescent receptor and anion was systematically studied. Among them, tert-butyl phenol derivatives with fluorine and boron fluorescence sites can selectively recognize F? ; And 3

Methyl-substituted tert-butyl receptors cannot distinguish three basic anions: F-, AcO- and H2PO4-. The results show that phenolic hydroxyl groups

Spatial response, σ-π? Super-yoke effect and different substitution positions of fluorine and boron fluorescence are the key factors of anion selectivity of system receptors.

4.

The photochemical sensing effect of simple indole receptor molecules on anions was studied. The results show that the introduction of chromophores with different electron-withdrawing abilities, such as anthrone, indanone and malononitrile, can adjust the NH of indole.

Protons are acidic, which makes them match with basic anions and realizes the selective colorimetric recognition of anions. In water system, NH has a strong electron-withdrawing chromophore receptor.

The group has strong acidity and can react with basic anions. The recognition mechanism and action mode are discussed.