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Carbono tetracoordinado plano versus boro tetracoordinado plano: el caso de CB4 y su catión
Zhong-hua Cui1, Maryel Contreras, Yi-hong Ding
1State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People's Republic of China.
Journal of the American Chemical Society
|July 29, 2011
Resumen
Este estudio revela que el tetrahidruro de carbono neutro (CB(4) tiene una estructura de carbono tricoordinada plana. Sin embargo, su catión, CB ((4) ((+), presenta de manera única un átomo de carbono tetracoordinado plano.
Área de la Ciencia:
- Química computacional es la química computacional.
- Química cuántica es la química cuántica.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Estudios previos sobre las estructuras de la CB(4) arrojaron resultados contradictorios.
- La existencia y la estabilidad de las estructuras planas de carbono tetracoordinado (ptC) son de gran interés teórico.
Objetivo del estudio:
- Para determinar con precisión la estructura del estado fundamental del neutro CB (((4) y su catión, CB (((4) ((+).
- Para investigar la influencia de la carga en la estabilización de las estructuras de carbono tetracoordinadas planas.
Principales métodos:
- Cálculos cuántico-químicos de alto nivel utilizando el método CCSD ((T) con conjuntos de base aumentados de correlación consistente (aug-cc-pVQZ//aug-cc-pVTZ).
- Análisis de la geometría molecular y la estructura electrónica.
Principales resultados:
- La molécula neutral CB ((4) adopta un mínimo global C ((s) con un carbono tricoordinado plano, consistente con los hallazgos de Boldyrev y Wang, pero contradiciendo investigaciones anteriores.
- El catión CB ((4) ((+) exhibe un átomo de carbono tetracoordinado plano (ptC), una estructura no observada previamente para esta especie.
Conclusiones:
- El estado de carga tiene un impacto significativo en la coordinación del átomo de carbono en CB ((4).
- La estabilización de una estructura de carbono tetracoordinada plana puede lograrse modificando la carga de la molécula.
- Este trabajo proporciona información crucial sobre los enlaces fundamentales y las propiedades estructurales de las nuevas especies que contienen carbono.
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