Novos calcogenolatos de paládio(II) contendo núcleo [Pd2(-ER)2]: síntese e caracterização estrutural
This work describes the synthesis and structural characterization of six new palladium(II) chalcogenolates derivatives containing [Pd2(-ER)2] core. These six compounds were characterized by single crystal X-ray diffraction and complementary methods as well. In order to get intermolecular Pd∙∙∙Pd in...
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2016 |
| País: | Brasil |
| Institución: | Universidade Federal de Santa Maria (UFSM) |
| Repositorio: | Manancial - Repositório Digital da UFSM |
| Idioma: | portugués |
| OAI Identifier: | oai:repositorio.ufsm.br:1/28343 |
| Acceso en línea: | http://repositorio.ufsm.br/handle/1/28343 |
| Access Level: | acceso abierto |
| Palabra clave: | Calcogenolatos de paládio(II) Adição oxidativa Interações Pd∙∙∙Pd Difração de raios X Band gap Palladium(II) chalcogenolates Oxidative addition Pd∙∙∙Pd interactions X-ray diffraction CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
| Sumario: | This work describes the synthesis and structural characterization of six new palladium(II) chalcogenolates derivatives containing [Pd2(-ER)2] core. These six compounds were characterized by single crystal X-ray diffraction and complementary methods as well. In order to get intermolecular Pd∙∙∙Pd interactions, it was planned the rational synthesis of these compounds by oxidative addition reactions of palladium(II) with organic dichalcogenides; and ligands substitution reactions. For this reason, it was explored the use of mercury chalcogenolates [Hg(ER)2] and organic dichalcogenides [(ER)2], where E = Se, Te and R = aryl, with palladium(II) halides and phosphine, bipyridine or phenanthroline ligands. The ligands substitution reactions using Hg{Te((2,6-OCH3)2C6H3)}2, palladium(II) halides and phosphine, bipyridine or phenanthroline ligands led to compounds 1, 3 and 4. The oxidative addition reaction of PdI2 by {Te((2,6-OCH3)2C6H3)}2, using PCy3, led to the formation of compound 2, and compounds 5 and 6 were formed by the ligands substitution reactions using Hg(SePh)2, palladium(II) halides and phosphine, bipyridine or phenanthroline ligands. It was observed that sterically hindered ligands avoided intermolecular Pd∙∙∙Pd interactions (compounds 1-4) while sterically unhindered ligands led to these contacts (compounds 5 and 6). The optical band gap of compounds 1-6 was calculated, in order to evaluate the optical properties and possible applications on the field of material science. |
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