Synthesis and characterization of some azo-anil dyes

Article abstract of DOI:10.1080/10587259508038702

A number of azo-anil dyes of the type RR'N-φ-N--N-φ-N--6CH-φ-Y with Y=CN or NO₂ and R,R′=Me, Me; Me,C₆H₁₃; Et,Pr and C₆H₁₃,C₆,H₁₃ were synthesized by reactions of the aminosubstituted nitrosoamine with phenylene diamine followed by condensation of the resulting aniline with the appropriate 4-substituted benzaldehyde. Mesomorphic properties were determined both by hot-stage polarizing microscopy and DSC. A nematic phase was observed only when R=R′=CH₃ while smectic A phases occurred in the other homologs. Melting temperatures were greater than 130°. All had colors ranging from red to orange with UV λ_max ranging from 448-459 nm and ε 2.20-3.67 E+4. The ΔH melting values ranged from 16.8 to 30.7 KJ/mole and solubilities in a BDH-E7 liquid crystal mixture were low.

Full text of DOI:10.1080/10587259508038702

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Molecular Crystals and Liquid Crystals
Science and Technology. Section A.
Molecular Crystals and Liquid Crystals
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Synthesis and Characterization of Some
Azo-Anil Dyes
M. E. Neubert a , S. J. Hummel a , J. C. Bhatt a , S. S. Keast a , A. M.
Lackner b , J. D. Margerum b & E. Sherman b
a Liquid Crystal Institute, Kent State University , Kent, OH, 44242
b Hughes Research Laboratories , 3011 Malibu Canyon Road, Malibu,
CA, 20265
Published online: 23 Sep 2006.
To cite this article: M. E. Neubert , S. J. Hummel , J. C. Bhatt , S. S. Keast , A. M. Lackner , J. D.
Margerum & E. Sherman (1995) Synthesis and Characterization of Some Azo-Anil Dyes, Molecular
Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals,
260:1, 287-300, DOI: 10.1080/10587259508038702
To link to this article: http://dx.doi.org/10.1080/10587259508038702
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