Preparation Of Porphyrin Phthalocyanine-Based Compounds And Research On Sensing Properties

Porphyrin phthalocyanine-based derivatives have uniqueπ-conjugated electronic structures and molecular structures with excellent characteristics such as easy functional modification.With a rich variety of derivatives,it has become a research focus in the field of optoelectronic functional materials.In this thesis,porphyrin phthalocyanine-based derivatives are used as the electroactive center.Aiming at the problem of insufficient analyte recognition ability in electrochemical sensing,calixarene,one of the representatives of host compounds with molecular size recognition and enrichment capabilities in the third-generation supramolecules,is selected as the selective recognition group for molecule with a specific size.And combining it with porphyrin,exploring the influence of different assembly methods on the sensing properties of the material to obtain the new type of gas sensing molecular material with excellent responsiveness.In order to further improve the sensitivity and stability of the sensor,we choose phthalocyanine with more excellent conductivity as the active layer of the sensor.And a stable and highly selective gas sensing material which can be used in air at room temperature was prepared via introducing trifluoroethoxy groups to the phthalocyanine,and constructing the aggregate active layer on it by the drip coating method.This work not only provides innovative ideas but also explores new ways for the development of new types of gas sensing materials which can be measured under air.The specific research content is as follows:1)Research on high-selectivity sensor for NO₂ gas at room temperature based on calixarene-modified porphyrin-based derivativesThe existing para-hydroxy porphyrin compound H₂[trans-（OH）₂PP]and calix[4]arene（C[4]A）was used for physical combination as the active layer material of the sensor.The new sensor material combining the excellent photoelectric properties of porphyrin and the selective recognition ability of calix[4]arene was created and characterized through some characterization analysis.The sensors,which were prepared by the simultaneous phase transfer method and the Quasi-Langmuir-Sh?fer（QLS）method,which are simple,convenient,efficient,low cost,and can be prepared quickly,have excellent sensing properties and are significantly better than the national NO₂ and detection standards（37-112 ppb）.By comparing the properties of sensor materials prepared by physical assembly and intermolecular force regulation,the preparation strategy of sensor materials is expanded,which provides a research idea for simple and efficient preparation of sensor materials.2)Research on the sensing properties of trifluoroethoxy copper phthalocyanine based on different substitution sites at room temperatureIn order to explore the feasibility of detecting NO₂ in colleges and universities,the phthalocyanine compounds CuPc（α-OCH₂CF₃）₈ and CuPc（β-OCH₂CF₃）₈ with two substituent sites were determined and prepared via various screenings and tests.Through a series of characterization and analysis of its properties,the two kinds of phthalocyanine aggregate sensing active layers were synthesised by the simple and convenient drip coating method in the previous work.First,N₂ was used as a carrier gas to test its sensing properties for NO₂,and it was found that both materials have good high-response properties at room temperature.Based on this,the carrier gas was changed to synthetic air and found that,it can also show exceptional sensing due to the dense morphology of CuPc（α-OCH₂CF₃）₈ aggregates and the non-external orientation of trifluoroethoxy groups.nature.Furthermore,the amazing selectivity was proved because they have no obvious response to H₂S,NH₃,SO₂ and CO₂.