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A novel azocompound, 2-(4-phenylazoaniline)-4-phenylphenol: Spectroscopic and quantum-chemical approach

Authors

  • Inés Nicolás-Vázquez,

    Corresponding author
    1. Departamento de Ciencias Químicas, Campo 1, Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México, Av. 1ro de Mayo s/n, Col. Santa María de las Torres, Cuautitlán Izcalli, 54740, Estado de México
    • Departamento de Ciencias Químicas, Campo 1, Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México, Av. 1ro de Mayo s/n, Col. Santa María de las Torres, Cuautitlán Izcalli, 54740, Estado de México
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    • Fax: (01) 555 623 2056

  • Guadalupe Pérez-Caballero,

    Corresponding author
    1. Departamento de Ciencias Químicas, Campo 1, y Laboratorios de Fisicoquímica Analítica y Especiación Química. Unidad de Investigación Multidisciplinaria, Facultad de Estudios Superiores-Cuautitlán, Campo 4, Universidad Nacional Autónoma de México, Cuautitlán Izcalli, 54700, Edo. México, México
    • Laboratorios de Fisicoquímica Analítica y Especiación Química. Unidad de Investigación Multidisciplinaria, Facultad de Estudios Superiores-Cuautitlán, Campo 4, Universidad Nacional Autónoma de México, Cuautitlán Izcalli, 54700, Edo. México, México
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    • Fax: (01) 555 623 2056

  • Annia Galano Jiménez,

    1. Área de Química Analítica, Departamento de Química, Universidad Autónoma Metropolitana, Unidad Iztapalapa, México D.F. C.P. 09340, México
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  • Georgina Guzmán Rangel,

    1. Departamento de Ciencias Químicas, Campo 1, Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México, Av. 1ro de Mayo s/n, Col. Santa María de las Torres, Cuautitlán Izcalli, 54740, Estado de México
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  • René Miranda Ruvalcaba

    1. Departamento de Ciencias Químicas, Campo 1, Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México, Av. 1ro de Mayo s/n, Col. Santa María de las Torres, Cuautitlán Izcalli, 54740, Estado de México
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Abstract

A novel azocompound with two nonequivalents azo groups, 2-(4-phenylazoaniline)-4-phenylphenol, was synthesized and characterized by spectroscopic and computational analysis. An intramolecular hydrogen bonding (HB), [BOND]O1[BOND]H1···N1[BOND], involving the [BOND]N1[DOUBLE BOND]N2[BOND] group and the proton in a neighbor hydroxyl moiety, was identified. It was found responsible for a characteristic π-conjugated H1[BOND]O1[BOND]C18[DOUBLE BOND]C13[BOND]N2[DOUBLE BOND]N1[BOND] six-membered cyclic fragment. It is worth noting that this azo group is involved in an azo-hydrazo equilibrium, being the azo form the most stable one. This resonance-assisted HB was characterized using the OH-related infrared bands and the corresponding signals in 1H NMR. In addition, conformational studies and geometrical and electronic parameter calculations were performed using the density functional theory, at B3LYP/6-311++G** level. Bond and ring critical points were identified using the atoms in molecules theory, which allowed confirming the intramolecular HB. The second azo-group cannot be involved in HB, but it also presents two stereoisomerics forms corresponding to cis (Z) and trans (E) configurations, with the later being the one with the lowest energy. © 2013 Wiley Periodicals, Inc.

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