Premium
A Porphyrin‐Bridged Pd Dimer Complex Stabilizes Gold Nanoparticles
Author(s) -
Fratoddi Ilaria,
Battocchio Chiara,
Polzonetti Giovanni,
Sciubba Fabio,
Delfini Maurizio,
Russo Maria Vittoria
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201100339
Subject(s) - porphyrin , chemistry , colloidal gold , nanoparticle , photochemistry , bimetallic strip , quenching (fluorescence) , covalent bond , dimer , crystallography , absorption spectroscopy , surface plasmon resonance , fluorescence , metal , nanotechnology , organic chemistry , materials science , physics , quantum mechanics
A porphyrin‐bridged bimetallic palladium(II) diphenylacetylide complex and the oligomer with 3–5 repeat units have been prepared and spectroscopically characterized. The porphyrin‐bridged Pd complex has been used for the stabilization of gold nanoparticles, thus giving rise to unexpected stable structures with no evidence of covalent bonds between the porphyrin and the gold nanoparticles. The morphology investigated by TEM analysis shows that gold nanoparticles with a mean diameter of about 5 nm have been obtained. UV/Vis spectra reveal the achievement of stabilized gold nanoparticles through the presence of the plasmon resonance at 500 nm together with the absorption features of the porphyrin molecule at 436 and 620 nm (Q band). Photoluminescence spectra exhibit an emission feature centred at 572 nm with a shoulder at 325 nm with no quenching effects. XPS measurements at the Au 4f core level suggest an electronic interaction between the gold atoms of the nanoparticle surface and the porphyrin‐based complex; NMR spectroscopic studies indicate that interactions and assemblies also occur that involve the porphyrin rings. Elemental analysis suggests that about 120 tilted porphyrins are physisorbed onto the Au core.