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Effect of the Functionalization of the Axial Phthalocyanine Ligands on the Energy Transfer in QD‐based Donor–Acceptor Pairs
Author(s) -
Dayal Smita,
Li Jun,
Li YingSyi,
Wu Hongqiao,
Samia Anna C. S.,
Kenney Malcolm E.,
Burda Clemens
Publication year - 2007
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2007.00227.x
Subject(s) - steric effects , phthalocyanine , chemistry , surface modification , photochemistry , acceptor , alkyl , quantum dot , functional group , molecule , density functional theory , stereochemistry , materials science , computational chemistry , organic chemistry , nanotechnology , physics , condensed matter physics , polymer
This study examines the electronic coupling between quantum dots (QDs) and molecules on their surfaces as a function of the modality of their interaction. As a probe, the energy transfer (ET) between CdSe QDs and phthalocyanines (Pcs) was monitored and evaluated with regard to the functionalization of the axial phthalocyanine ligand, bulkiness of the functional group bridging the QD donor and Pc acceptor, and the number of the functionalized axial ligands. New silicon PCs and their conjugates with CdSe QDs were synthesized. The ET efficiency and kinetics were studied by steady state and femtosecond time‐resolved absorption spectroscopy. We observed a decrease in ET efficiency with the increase in functional group bulkiness, which could be explained by increasing steric hindrance between the ET pair. In addition, a higher ET efficiency was observed for amino and thiol functionalized Pcs compared to Pcs without functional group on the axial alkyl chain.