Surface functionalization of cadmium sulfide quantum confined nanoclusters6: Evidence of facile electronic communication between remote surface sites

CdS Nanoparticles Modified to Chalcogen Sites: New Supramolecular Complexes, Butterfly Bridging, and Related Optical Effects

“…The discussion of adsorption properties of the CuBMmodified CdS brings about an important question regarding the interaction between the surface modifier and NPs. While there are both experimental 6,[8][9][10][11][12]44,45 and theoretical 12 evidence of the electronic communication between aromatic modifiers and II-VI semiconductor clusters in the structures studied previously, these effects remain difficult to observe by UV absorption spectroscopy. One of the reasons is the difficulty of shifting the energy of the core levels of NP, which are mainly determined by crystal lattice of the semiconductor NP in the interior rather than by the exterior atoms and the interference from other processes such as scattering.…”

“…In many studies on the surface modification of II-VI semiconductor NPs with different organic ligands, their pairing with optically active compounds such as dyes, aromatic hydrocarbons, etc., was aimed at finding the effects from the charge carrier exchange between the electronic levels of a NP core and a modifier . There are direct UV−vis spectroscopy pieces of evidence about the existence of such effects in very small Cd 32 S 14 clusters that have been obtained. , There is also other evidence of NP-NP and NP-modifier carrier exchange as conductivity changes in NP-polymer composites when interparticle bridges replace partially the stabilizer layer and stimulate such processes via conjugation through aromatic heterocycles − or aromatic thiols. , …”

“…5 There are direct UV-vis spectroscopy pieces of evidence about the existence of such effects in very small Cd 32 S 14 clusters that have been obtained. 6,7 There is also other evidence of NP-NP and NP-modifier carrier exchange as conductivity changes in NP-polymer composites when interparticle bridges replace partially the stabilizer layer and stimulate such processes via conjugation through aromatic heterocycles [8][9][10][11] or aromatic thiols. 10,12 All current strategies of II-VI semiconductor NP functionalization are based either on the exchange of a stabilizer bound to the metal sites on the NP's surface or on the chemical modification of its terminal group.…”

Methyl 2-(2-pyridyl)quinoline-4-carboxylate

“…To address this dilemma, a rigorous synthetic research effort towards the structural variation of the commonly used ligands, such as bipyridines, phenanthrolines and terpyridines, must be conducted in order to develop such analogues, where differences in electronic and steric properties may lead to modification of the resulting metal complexes. We have synthesized and characterized a novel diimine ligand, methyl 2-(2-pyridyl)quinoline-4-carboxylate, (I), and covalently bound it into a polymeric matrix (Farah et al, 2000) and on to CdS nanoparticle (Veinot et al, 2000). We report here the synthesis and crystal structure of (I).…”

cis-(2,2′-Bipyridine)bis[2-(2-pyridyl)-4-methoxycarbonylquinoline]ruthenium(II) hexafluorophosphate

“…These complexes have been covalently attached into polymeric (Farah & Pietro, 1999Farah et al, 2000) and CdS nanocluster assemblies (Veinot et al, 2000) through appropriate chemical modification. Detailed structural information is important in achieving a better understanding of the different photochemical, photophysical and electrochemical properties of the ruthenium chromophores (Juris et al, 1988).…”