Thermodynamic, transport and optical properties of formamide + 1,2-ethanediol, 1,3-propanediol and poly (ethylene glycol) 200 binary liquid mixtures

2017 ◽  
Vol 233 ◽  
pp. 222-235 ◽  
Author(s):  
Meysam Hemmat ◽  
Mehrdad Moosavi ◽  
Marzieh Dehghan ◽  
Esmaeel Mousavi ◽  
Abbas Ali Rostami
Keyword(s):  
Optical Properties ◽  
Ethylene Glycol ◽  
Liquid Mixtures ◽  
Binary Liquid Mixtures ◽  
Poly Ethylene Glycol ◽  
Binary Liquid ◽  
Poly Ethylene

Synthesis, characterization, and optical properties of a novel azo-dye bearing an oligo(ethylene glycol) methyl ether side chain in solution and in the solid state

2003 ◽  
Vol 81 (10) ◽  
pp. 1076-1082 ◽  
Author(s):  
Ernesto Rivera ◽  
Michel Belletête ◽  
Almeria Natansohn ◽  
Gilles Durocher
Keyword(s):  
Optical Properties ◽  
Solid State ◽  
Ethylene Glycol ◽  
Intermolecular Interactions ◽  
Methyl Ether ◽  
Azo Dye ◽  
Side Chain ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
Glycol Methyl Ether

A novel azobenzene compound bearing a short poly(ethylene glycol) methyl ether side chain, N-methyl-N-{4-[(E)-(4-nitrophenyl)diazenyl]phenyl}-N-(3,6,9,12,15,18,21,24-octaoxapentacos-1-yl)amine (RED-PEGM-8) was synthesized and characterized. RED-PEGM-8 exhibits a thermal behavior similar to that of Disperse Red-1; however, its thermal stability, as well as its Tg and Tm values, are lower because of the presence of the PEGM segment. The optical properties of this compound in solution and in the solid state were studied by UV–vis spectroscopy. The appearance of a blue-shifted band in aqueous solutions at high concentrations of the chromophore reveals the existence of H-type aggregates, resulting from π–π intermolecular interactions between the azobenzene units. Strong intermolecular interactions were also confirmed by 1H NMR measurements. Optical properties of RED-PEGM-8 in the solid state (thin film) also suggest the presence of H aggregates. However, a tail is also detected in the red region of the absorption spectrum, which could be because of the formation of J-type aggregates in the thin film.Key words: aggregation, azo-dye, poly(ethylene glycol) methyl ether.

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