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La complejidad de la unión coordinativa en el talio (I) antranilatos y salicilatos
Frank Wiesbrock1, Hubert Schmidbaur
1Anorganisch-Chemisches Institut der Technischen Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany.
Journal of the American Chemical Society
|March 20, 2003
Resumen
Los estudios estructurales de los compuestos de talio (I) revelan geometrías de coordinación flexibles, influenciadas por efectos relativistas y características de pareja solitaria. La coordinación del talio (I) está restringida a un hemisferio, pero es altamente adaptable, con interacciones débiles de arenos o talófilos que limitan el espacio abierto.
Área de la Ciencia:
- Química Inorgánica La Química Inorgánica es la química inorgánica.
- Química estructural de las estructuras.
- Coordinación Química de la Coordinación
Sus antecedentes:
- Los compuestos de talio exhiben números de coordinación y geometrías inusuales, a menudo atribuidos a efectos relativistas y comportamiento de pareja solitaria.
- Los datos existentes sobre la química estructural del talio carecen de reglas simples y generales para el enlace coordinado.
Objetivo del estudio:
- Para sintetizar y caracterizar una serie de talio estrechamente relacionados (I) antranilatos y salicilatos.
- Establecer reglas generales sencillas para el enlace coordinativo en complejos de talio.
Principales métodos:
- Preparación de tres antralatos de talio y tres salicilatos de talio a partir de carbonato de talio y sus correspondientes derivados de ácido benzoico.
- La cristalización de las soluciones acuosas.
- Análisis estructural de los seis compuestos resultantes.
Principales resultados:
- Los seis compuestos sintetizados mostraban estructuras cristalinas distintas con variaciones significativas en los motivos de coordinación.
- Una característica común es la coordinación de oxígeno dentro de menos de un hemisferio, con una coordinación adicional de anillo de nitrógeno o fenilo observada en compuestos específicos.
- Los contactos talio-talio eran generalmente largos y débiles, y el enlace de hidrógeno desempeñó un papel menor en el ensamblaje supramolecular, que estaba dominado por los puentes de oxígeno.
Conclusiones:
- La coordinación del talio ((I) se limita a un hemisferio, pero demuestra una notable flexibilidad, adaptándose a pequeñas variaciones estructurales como la sustitución del metilo.
- El hemisferio abierto puede ser influenciado por una coordinación débil de arenas o interacciones talófilas muy débiles.
- El estudio proporciona datos valiosos para comprender el comportamiento de coordinación matizado del talio (I) en compuestos relacionados.
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