Two 5-tetrazolylazo-8-hydroxyquinoline-based Zn(II) and Mn(II) complexes: syntheses, structures and optical properties

Qiu, Yan-Xuan; Lin, Wen-Ning; Li, Zhixin; Yang, Zhi-Jian Ou; Liu, Yang; Dong, Wen

doi:10.1080/00958972.2015.1080824

Cited by 3 publications

(1 citation statement)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…21 Recently, hetaryl azo dyes with a tetrazolyl fragment were synthesized as ligands for complex formation, and the structure and the luminescence properties of these complexes in the solid state were studied. 22,23 However, the solvent effects on the spectra of tetrazolyl-containing azo dyes were not considered in the literature.…”

Section: Introductionmentioning

confidence: 99%

Novel hetarylazo dyes containing tetrazole and hydroquinoline moieties: spectral characteristics, solvatochromism and photochemistry

Nekipelova

Khodot

Klimovich

et al. 2016

Photochem Photobiol Sci

View full text Add to dashboard Cite

Novel hetarylazo dyes containing tetrazole and tetra- or dihydroquinoline moieties were synthesized and their spectral properties in solvents of different polarities and H-bonding abilities were examined. The dyes exhibit solvatochromism dramatically depending on the proton accepting ability of solvents: (DMSO > HO > MeOH > ACN > CHCl) and the dye concentration. Upon dilution the absorption maximum of the visible band shows a blue shift and the absorption coefficient of the maximum decreases. This was accounted for by complex formation either between the dye molecules or between the dye and solvent molecules. The H-bond with partial proton transfer is formed between the acidic NH group of the tetrazole moiety of a dye molecule and the basic NH group of the hydroquinoline moiety of the other dye molecule or with a solvent with proton accepting ability. Upon dilution the equilibrium shifts to the complex with a solvent. The coexistence of several forms of the dye molecules with different absorption spectra was demonstrated in pulse photolysis upon excitation by light with different wavelengths. Three forms of cis-isomers were registered. The photogenerated cis-isomers decay with lifetimes from 200 μs to 5 ms. The fast cis-trans dark isomerization determines the photostability of the dyes.

show abstract

Section: Introductionmentioning

confidence: 99%