Interacción de derivados de Fenilhidrazona con aniones: efecto de los sustituyentes en el grupo fenilo

  • Glenys Ramírez-Valbuena La Universidad del Zulia
  • Marielis Chirinos-Iguarán Instituto Venezolano de Investigaciones Científicas
  • Katerin Boscán-Meleán Instituto Venezolano de Investigaciones Científicas
  • Rodolfo Izquierdo La Universidad del Zulia
  • Mayamaru Guerra La Universidad del Zulia
  • Jelen Restrepo Instituto Venezolano de Investigaciones Científicas
Palabras clave: fenilhidrazona, sensor colorimétrico, Job Plot, complejo receptor, huésped

Resumen

Se estudió la interacción de 16 derivados fenilhidrazonas con los aniones AcO-, H2PO4-, F- y Cl- mediante espectroscopía UV-Visible. Se sintetizaron los derivados 2-fenilhidracina sin nitro, 2-nitro, 4 nitro y 2,4-dinitro de 4-hidroxi (1-4), 4-metoxi (5-8), 4-dimetilamino bencilideno (9-12) y piridina (13-16). Se evaluó la relación entre la estructura de las hidrazonas y la constante de asociación. La estequiometría de los complejos se determinó por el método de variaciones continuas y la constante de asociación se determinó por el método de ajuste no lineal. Los derivados 4, 8, 12 y 15 presentaron interacción con AcO-;  esto se evidencia por el corrimiento batocrómico de la banda de absorción de la hidrazona. Sin embargo, los derivados 12 y 15 no se ajustaron a las ecuaciones aplicadas en este trabajo.  Los resultados para los derivados 4 y 8 sugieren la formación de un complejo del tipo receptor:huesped con estequiometria 1:2 y constantes de [K1 = 1,758 (±0,026)×104 and K2 = 2,310 (±0,033)×104] mol-1∙dm3 and [K1 = 4,703 (±0,073)×104 and K2 = 2,000 (0,066)×104] mol-1∙dm3 respectivamente.

Biografía del autor/a

Glenys Ramírez-Valbuena, La Universidad del Zulia

Química

Laboratorio de Electrónica Molecular

Marielis Chirinos-Iguarán, Instituto Venezolano de Investigaciones Científicas

Química

Laboratorio de Investigación en Síntesis Sustentable de Nuevos Materiales

Katerin Boscán-Meleán, Instituto Venezolano de Investigaciones Científicas

Química

Laboratorio de Investigación en Síntesis Sustentable de Nuevos Materiales

Rodolfo Izquierdo, La Universidad del Zulia

M. Sc. en Química

Laboratorio de Química Teórica y Computacional

Mayamaru Guerra, La Universidad del Zulia

Dra. en Física

Laboratorio de Polímeros

Jelen Restrepo, Instituto Venezolano de Investigaciones Científicas

Dra. en Química

Laboratorio de Investigación en Síntesis Sustentable de Nuevos Materiales

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Publicado
2019-04-04
Sección
Articles