Observation of induced CD on CdSe nanoparticles from chiral Schiff base Ni(II), Cu(II), Zn(II) complexes

We prepared supramolecular systems composed of extended chiral Schiff base Ni(II), Cu(II), and Zn(II) complexes having azo-groups, denoted as complexes 1–3, respectively, and CdSe nanoparticles with various particle sizes which exhibited the shift of absorption and fluorescence spectra. We observed and discussed induced CD bands on CdSe nanoparticles from 1 to 3 (denoted as systems 1–3+ CdSe). Absence of shifts in IR spectra suggested that complexes 1–3 did not contact to the surface of CdSe nanoparticles directly. Absence of cis-trans photoisomerization of complexes 1–3 suggested closely contact of 1–3 near the surface of CdSe nanoparticles. Decrease of the intensity of the CD band at 410 nm for each size of CdSe nanoparticles suggested new mechanism of induced CD bands for the mixed solution.