RESUMEN
A new cationic silver N-alkylpyridylporphyrin complex is able to 'sense' nanometric conductive particles with a diameter below 10 nm. The luminescence of the molecule changes its maximum from red to blue when it embraces a conductive (metallic or semiconducting) nanoparticle. The change is explained on the basis of a charge transfer between the molecule and the conductive nanoparticle along with a geometrical distortion of the porphyric ring and pyridinium substituents. This new molecule could be used to sense nanoparticle contamination in the environment, in the industry of heterogeneous catalysis and many other branches of nanometrological applications.
Asunto(s)
Mediciones Luminiscentes/métodos , Técnicas de Sonda Molecular , Nanoestructuras/química , Nanoestructuras/ultraestructura , Porfirinas/análisis , Porfirinas/química , Luminiscencia , Ensayo de Materiales , Conformación Molecular , Tamaño de la PartículaRESUMEN
A new chromium(III)-phthalocyanine complex with the formula [Cr(C(32)H(16)N(8))I], or CrPcI where Pc is phthalocyanate(2-), has been obtained by the reaction of pure Cr powder with phthalonitrile under a stream of iodine vapour. The five-coordinate Cr atom is bonded to the four isoindole N atoms of the phthalocyaninate(2-) ligand and to one apical iodine ligand, and has a square-pyramidal coordination geometry. The Cr(III) cation is significantly displaced [0.456 (2) A] from the N(4)-isoindole plane towards the I atom. The Cr-I bond is tilted 2.51 (4) degrees to the N(4)-isoindole plane.