Hexamethylenetetramine supporting halogen porous structures

• Autor(a) principal: Anyfanti, Goulielmina
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.13/1774
• topic: Porosity; X-rays; Halogen bonds; Hydrogen bonds; Porosidade; Raios X; Ponte de halogénio; Ponte de hidrogénio; Nanochemistry and Nanomaterials; .; Faculdade de Ciências Exatas e da Engenharia; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais

The increasing spread of nanotechnology has led to the design of new materials that represent a potential solution for several issues such as gas storage and gas separation, shape/size selective catalysis, drug storage and delivery. Among those materials, nanoporous structures have gradually aroused the attention of the scientific community. This interest is witnessed by the increasing number of publications about novel porous materials constructed from the assembly of molecular building blocks such as metal-organic frameworks. The most recent examples are supramolecular porous frameworks. These architectures are built up through traditional noncovalent interactions such as hydrogen bonds, π-π interactions. Most recent discoveries have found a novel type of bond that involves the participation of a halogen atom. This type of interaction assumes the name of halogen bond and is highly directional and hydrophobic. These features can be exploited for the design of defined structures. The present work is focused on the description of several halogen organic frameworks among which some of them present robust porous architectures. The structures were obtained by combining the tetrafunctional XB acceptor hexamethylenetetramine with different halogen bond donors. The work is divided into three parts. The literature part gives a background about nanoporous materials and their evolution with a section dedicated to the description of the halogen bond. The experimental section describes the methods used to obtain the supramolecular architectures. The final part discusses the structures and the noncovalent interactions that have driven their assembly.