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1.
Inorg Chem ; 62(4): 1667-1678, 2023 Jan 30.
Artigo em Inglês | MEDLINE | ID: mdl-36651698

RESUMO

The dissolution of gray selenium in tetraalkylphosphonium acetate ionic liquids was investigated by UV-vis, NMR, and Raman spectroscopy as well as quantum chemical calculations and electrochemical methods. Acetate anions and tetraalkylphosphonium cations facilitate the formation and stabilization of oligoselenides Sen2- and cationic Se species in the ionic liquid phase. Chemical exchange of selenium atoms was demonstrated by variable-temperature 77Se NMR experiments. Additionally, uncharged cycloselenium molecules exist at high selenium concentrations. Upon dilution with ethanol, amorphous red selenium precipitates from the solution. Moreover, crystalline Se1-xTex solid solutions precipitate when elemental tellurium is added to the mixture as confirmed by powder X-ray diffraction and Raman spectroscopy.

2.
Angew Chem Int Ed Engl ; 61(22): e202117730, 2022 05 23.
Artigo em Inglês | MEDLINE | ID: mdl-35285126

RESUMO

Clean air is an indispensable prerequisite for human health. The capture of small toxic molecules requires the development of advanced materials for air filtration. Two-dimensional nanomaterials offer highly accessible surface areas but for real-world applications their assembly into well-defined hierarchical mesostructures is essential. DUT-134(Cu) ([Cu2 (dttc)2 ]n , dttc=dithieno[3,2-b : 2',3'-d]thiophene-2,6-dicarboxylate]) is a metal-organic framework forming platelet-shaped particles, that can be organized into complex structures, such as millimeter large free-standing layers (carpets) and tubes. The structured material demonstrates enhanced accessibility of open metal sites and significantly enhanced H2 S adsorption capacity in gas filtering tests compared with traditional bulk analogues.


Assuntos
Estruturas Metalorgânicas , Nanoestruturas , Adsorção , Pisos e Cobertura de Pisos , Humanos , Estruturas Metalorgânicas/química , Metais
3.
Chem Commun (Camb) ; 47(18): 5151-3, 2011 May 14.
Artigo em Inglês | MEDLINE | ID: mdl-21437346

RESUMO

A new tool (Infrasorb-12) for the screening of porosity is described, identifying high surface area materials in a very short time with high accuracy. Further, an example for the application of the tool in the discovery of new cobalt-based metal-organic frameworks is given.


Assuntos
Cobalto/química , Compostos Organometálicos/química , Ensaios de Triagem em Larga Escala/métodos , Porosidade , Propriedades de Superfície
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