Unusual coordination environment for barium cations in ion recognition conducting poly[Ni(salen)(receptor)] films

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Tedim, J (Autor) Outra; Bessada, R (Autor) Outra; Patricio, S (Autor) Outra; Magalhaes, AL (Autor) FCUP; Freire, C (Autor) FCUP; Gurman, SJ (Autor) Outra; Hillman, AR (Autor) Outra

Revista

Título: Langmuir

Vol. 24 Nº 16

Páginas: 8998-9005

ISSN: 0743-7463

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 22 Citações

Scopus - 22 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

Outras Informações

ID Authenticus: P-003-WZ8

DOI: 10.1021/la801424k

Abstract (EN): [Ni(salen)] complexes bearing different crown ether receptors were electropolymerized to give films whose voltammetric signatures responded to Ba(2+). In line with DFT calculations, X-ray absorption spectroscopy (XAS) near the Ni K-edge showed the nickel local environment in the monomers and their corresponding polymers (in the presence or absence of barium) to be identical. However, the expectation of crown size-dependent barium local environment (based on geometry,and donor atom availability) was not found. XAS near the Ba K-edge showed that Ba(2+) in the films coordinated to only two oxygen donors, irrespective of crown size. This surprisingly low coordination number (compared to solution species) is accompanied by a higher barium/crown ratio than the anticipated 1: 1 stoichiometry. The implications of these effects for design and performance of sensors based on metal ion recognition chemistry are discussed.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8