Effect of the functionalization of the axial phthalocyanine ligands on the energy transfer in QD-based donor-acceptor pairs.
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.
Dayal
Smita
S
Center for Chemical Dynamics and Nanomaterials Research, Department of Chemistry, Case Western Reserve University, Cleveland, OH, USA.
Li
Jun
J
Li
Ying-Syi
YS
Wu
Hongqiao
H
Samia
Anna C S
AC
Kenney
Malcolm E
ME
Burda
Clemens
C
D004735:Energy Transfer; D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D007700:Kinetics; D008024:Ligands; D015394:Molecular Structure; D045663:Quantum Dots; D013053:Spectrophotometry
D007211:Indoles; D054833:Isoindoles; D008024:Ligands; C013647:phthalocyanine