Hybrid system based on styrylquinoline ligand and CdS quantum dots

Microwave synthesis of hybrid organo-inorganic nanosystems based on CdS quantum dots and photoactive styrylquinoline ligand

“…Having an effect on such ligands, one can control the properties of hybrid nanosystem as a whole [4]. Of specific interest are hybrid nanosystems with photosensitive ligands whose properties can be controlled easily on exposure to light by changing the light wavelength and intensity and irradiation time [5][6][7].…”

“…Since the functional ligand can decompose under the high-temperature conditions of QD synthesis, hybrid nanosystems are usually synthesized by ligand exchange, for which purpose a colloidal solution of nanoparticles stabilized with an inert (supporting) ligand is mixed with a solution of the functional ligand. As a result of exchange reaction, a portion of the inert ligand molecules are replaced with the functional ones [7].…”

Spectral and photochemical properties of hybrid organic–inorganic nanosystems based on CdS quantum dots and merocyanine ligands

“…In case of HNS-2, the 360 nm band was observed as a separate band and reproduced the absorption spectrum of styrylquinoline, the product of the MC-FL demethylation reaction. 29 The PL QYs of the free QDs and MC-FL are 0.0040 and 0.0076, respectively. The QDs QY in HNS-1 decreases to 0.0025, whereas the MC QY significantly increases up to 0.0160.…”

“…29 The van der Waals size of the styrylquinoline trans-isomer in the maximal extended conformation along a long axis is 3.0 nm, whilst the sizes of the (CH 2 ) 9 chain and benzyl mercaptan are 1.0 nm. The calculated r = 1.89 nm is the distance between the centers of the donor and acceptor.…”

“…it is incorporated into the benzyl mercaptan shell of the QDs. The assumed HNS structure, considering the size ratio of the QDs and ligands, 29 is shown in Scheme 1. Thus, the flexible polymethylene chain is twisted in the HNS, and the MC-fragment is actually very close to the QDs surface.…”