Synthesis and spectral properties of phthalocyanine compounds

In order to effectively resist the threat of hyperspectral imaging and reconnaissance and achieve "the same spectrum and color" of camouflage paint and plants, based on the similarity between phthalocyanine and chlorophyll porphyrin structure, the synthesis of phthalocyanine compounds and the fitting of plant spectral features are carried out. The planar phthalocyanine structure of the electron-withdrawing substituent and the divalent transition center ion is constructed. The phthalocyanine compounds are synthesized by DBU catalysis and self-made synthesis equipment. The optimal synthesis conditions and purification methods are investigated. The absorption and reflectance spectra of the products are tested by spectrophotometer to study the influence of central ion and aggregation on the spectral properties of phthalocyanine compounds. The experimental results show that the reaction time of tetranitrometal phthalocyanine is the shortest at 240~250℃ under the action of catalyst; cobalt phthalocyanine has a sharper absorption peak than the phthalocyanine product formed by iron, zinc, copper and other centrally substituted ions, which is more similar to the green plant spectral curve; the spectral reflection curve of the phthalocyanine compound shifts with the influence of temperature, purity and dispersion state on the product aggregation state. The absorption spectrum of tetra-nitro cobalt phthalocyanine synthesized at 220~240℃ for 20~30 min are in agreement with the Q band absorption characteristics of phthalocyanine compounds, and its peak wavelengths are matched with the plant spectrum. It provides new methods and new approaches for the application of phthalocyanine pigments in the fields of military, textile, dye and bionic etc.