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Detección exclusiva de iones Ni2+, Cu2+, Zn2+ y CO2 utilizando una nueva base de Schiff

Siddharth Gautam¹, Nitish Kumar Singh^1,2, Nancy Gupta³

¹Department of Chemistry, Netaji Subhas University of Technology, Dwarka Sector-3, Dwarka, Delhi, 110078, India.

Journal of fluorescence

|September 5, 2025

Resumen

Un nuevo ligando de base de Schiff basado en quinolina (L) permite la detección colorimétrica y fluorescente selectiva de iones Ni2+, Cu2+, Zn2+ y aniones CO2. Este robusto sensor ofrece señales visuales y bajos límites de detección para aplicaciones prácticas.

Área de la Ciencia:

Química de coordinación
Química analítica
Ciencias de los materiales

Sus antecedentes:

El desarrollo de quimiosensores selectivos y sensibles para el monitoreo ambiental y biológico es crucial.
Los ligandos de base de Schiff ofrecen plataformas versátiles para el diseño de sensores de iones y aniones metálicos.
Los métodos existentes a menudo carecen de capacidades de detección visual o de suficiente sensibilidad.

Objetivo del estudio:

Sintetizar y caracterizar un nuevo ligando de base de Schiff basado en quinolina (L).
Investigar el potencial del ligando para la detección colorimétrica y fluorescente selectiva de iones y aniones metálicos específicos.
Para aclarar los mecanismos de detección y evaluar las métricas de rendimiento del sensor.

Principales métodos:

Síntesis y caracterización del ligando de base de Schiff basado en quinolina (L).
Estudios espectroscópicos (UV-Visible, fluorescencia, FTIR, RMN) para la caracterización y el esclarecimiento del mecanismo de detección.
El gráfico de Job, el ESI-MS y los cálculos de la teoría funcional de la densidad (DFT) para la estequiometría compleja y las propiedades electrónicas.

Principales resultados:

El ligando (L) exhibió distintos cambios colorimétricos a simple vista para los iones Ni2+, Cu2+ y Zn2+.
Se observó una respuesta selectiva de fluorescencia verde de "encendido" para Zn2+, y el apagado de fluorescencia para los aniones CO2-.
Se lograron límites bajos de detección (LOD) y cuantificación (LOQ) para CO3−, con una estequiometría metal-ligando 1:2 confirmada.

Conclusiones:

El nuevo ligando de base de Schiff basado en quinolina demuestra capacidades de detección multifuncionales y selectivas.
El sensor ofrece capacidad de respuesta visual, alta selectividad y límites de detección competitivos para aplicaciones prácticas.
El análisis DFT confirmó las propiedades electrónicas del ligando y su idoneidad para la coordinación de iones metálicos.

Palabras clave:

Las sondas cromofluorogénicas Cálculos de las DFT Sensores de la base Schiff Enlace selectivo

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