Abstract
We have prepared supramolecular systems of chiral Schiff base Ni(II), Cu(II), Zn(II) complexes and colloidal gold nanoparticles (AuNP) of 10 nm diameters. They demonstrated that direct adsorption of chiral Schiff base metal complex on the surface of AuNP owing to observation of clear induced CD spectra for the first time. We observed and discussed induced CD bands on AuNP from chiral Schiff base Ni(II), Cu(II), Zn(II) complexes.
Highlights
The plasmon concept of plasmon resonance energy transition is applied to SER and SERS [6] [7] [8] [9] [10] and the plasmon concept of multiphoton photoluminescence is used to light-emitting systems [11], the concept of magnetic plasmon propagation is used to plasmonic antiferromagnetism [12]
To date we have reported induced Circular dichroism (CD) due to chiral Schiff base metal complexes onto various materials, for example, achiral Schiff base metal complexes [27], achiral ferrocene [28], metallodendrimers and metal nanoclusters made in them [29] [30], nanoparticles of metal semiconductors [31]
We have observed significantly enhanced induced CD bands on AuNP for chiral Schiff base complexes and estimated their molecular arrangement based on parallel transition dipole moment
Summary
Metal nanoparticles including gold nanoparticles have been a subject of research. Open Access and applications in various fields because it has unique properties of surface plasmon resonance (SPR). Intensity of induced CD increases or decreases depending on parallel and perpendicular arrangement of transition moments of metal nanoparticles and chiral additive molecules, respectively [20]. Some chiral Schiff base complexes have large electronic transition dipole moment, but less induced CD can be observed experimentally. Chiral AuNP catalysts will be expected as candidate materials for organic silanol reaction that has been used as an attractive nucleophile agent mainly. The third is a molecule conversion utilizing specific reactivity of the silicon-bonded carbon one based on the presence of silanol hydroxyl groups. We have successfully observed considerably intense induced CD demonstrated onto AuNP in plasmon region due to chiral Schiff base Ni(II), Cu(II), and Zn(II) complexes (compound 1a-1c) for the first time.
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