2,5-Diaryl-1,3,4-oxadiazoles: synthesis, spectral-luminescent properties, and complexation with beryllium(ii)

• Published in: Russian chemical bulletin Vol. 69; no. 12; pp. 2302 - 2306
• Main Authors: Mikhailov, I. E., Artyushkina, Yu. M., Dushenko, G. A., Minkin, V. I.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2020
• Subjects: Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Full Articles; Inorganic Chemistry; Organic Chemistry; metal complexes; 2,5-diaryl-1,3,4-oxadiazoles; organic and metal complex phosphors; luminescence
• ISSN: 1066-5285; 1573-9171
• DOI: 10.1007/s11172-020-3039-5

Cyclization of aroylbenzohydrazides in SOCl 2 was used to obtain 2,5-diaryl-1,3,4-oxadiazoles, and to study their spectral-luminescent properties. Oxadiazoles with phenyl or 2-methoxyphenyl substituents at position 2 of the oxadiazole ring have a luminescence with a high quantum yield in polar and nonpolar solvents (λ fl max = 378−424 nm, φ = 0.88−0.98). Replacement of these groups with a 2-phenol substituent results in a ligand with strong emission only in highly polar aprotic DMSO (λ fl max = 397 nm, φ = 0.18). Based on this ligand, a chelated beryllium complex with the composition L 2 Be was obtained, which has a strong luminescence in the violet region of the visible spectrum (λ fl max = 410−414 nm, φ = 0.34−0.48).