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Preparación y fotoquímica del trípeto de vinilarsinideno

Weiyu Qian¹, Peter R Schreiner¹, Artur Mardyukov¹

¹Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany.

Journal of the American Chemical Society

|December 25, 2023

Resumen

Los investigadores sintetizaron y caracterizaron espectroscópicamente el vinilarsinideno, una molécula altamente reactiva. Este avance abre nuevas vías para la comprensión de los pnictinidenos vinílicos en las reacciones químicas.

Área de la Ciencia:

Química organometálica
Espectroscopia
La fotoquímica

Sus antecedentes:

Los pnictinidenos vinílicos son moléculas escurridizas y altamente reactivas.
Se proponen como intermediarios clave en las reacciones químicas.
Los estados de base electrónicos de cáscara abierta son comunes en estos compuestos.

Objetivo del estudio:

Para sintetizar y caracterizar espectroscópicamente el vinillarsinideno, un congénero más alto del vinilnitreno.
Investigar la reactividad y la fotoquímica del vinilarsinideno.

Principales métodos:

Fotólisis a baja temperatura de la diazidovinylarina en una matriz de argón a 10 K.
Pirólisis en alto vacío de la diazidovinylarina a 700 °C.
Espectroscopia infrarroja (IR) y UV/vis para la caracterización.
Teoría funcional de la densidad (DFT) y cálculos CASPT2 para la racionalización del mecanismo.

Principales resultados:

El vinilarsinideno triplet fue sintetizado y caracterizado con éxito.
La molécula muestra una rica fotoquímica unimolecular.
La fotoirradicación conduce a reorganizaciones que forman vinildenarzina, 2H-arsireno, etinylarsinideno triple o un complejo de arsínideno-acetileno.

Conclusiones:

El aislamiento y la caracterización exitosos del vinilarsinideno proporcionan evidencia experimental para esta clase de compuestos.
El estudio aclara la compleja fotoquímica del vinilarsinideno.
Los métodos computacionales fueron cruciales para comprender los mecanismos de reacción.

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