The role of the base nature during complexation of 2-hydroxy-9(10),16(17),23(24)-tri-tert-butyl-29H,31H-phthalocyanine ligand (1) with zinc acetate was studied by the UV-vis spectroscopy and DFT calculations. The latter allowed us to explain the selective formation of double-coordinated J-type dimer in the presence of lithium methoxide. Spectropotentiometry was used to study the nucleophilic properties of the dimeric complex in comparison with the corresponding monomer and has demonstrated the strong intramolecular interactions of macrocycles.
This article discusses the aspects of the use of intumescent flame retardants to reduce the fire hazard of technical fabrics made of natural fibers. The effectiveness of bulging compositions based on tannic acid is shown. Experimental data on the fire-hazardous properties of the starting material and its constituent textile fibers, as well as fabrics treated with an intumescent flame retardant, are presented.
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