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First Example of Nonlinear Optical Materials Based on Nanoconjugates of Sandwich Phthalocyanines with Quantum Dots.

Authors :
Oluwole DO
Yagodin AV
Mkhize NC
Sekhosana KE
Martynov AG
Gorbunova YG
Tsivadze AY
Nyokong T
Source :
Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2017 Feb 24; Vol. 23 (12), pp. 2820-2830. Date of Electronic Publication: 2017 Jan 31.
Publication Year :
2017

Abstract

We report original, selective, and efficient approaches to novel nonlinear optical (NLO) materials, namely homoleptic double- and triple-decker europium(III) complexes 2 and 3 with the A <subscript>3</subscript> B-type phthalocyanine ligand (2,3-bis[2'-(2''-hydroxyethoxy)ethoxy]-9,10,16,17,23,24-hexa-n-butoxyphthalocyanine 1) bearing two anchoring diethyleneglycol chains terminated with OH groups. Their covalently linked nanoconjugates with mercaptosuccinic acid-capped ternary CdSeTe/CdTeS/ZnSeS quantum dots are prepared in the presence of an ethyl(dimethylaminopropyl)carbodiimide activating agent. Optical limiting (OL) properties of the obtained low-symmetry complexes and their conjugates with quantum dots (QDs) are measured for the first time by the open-aperture Z-scan technique (532 nm laser and pulse rate of 10 ns). For comparison, symmetrical double- and triple-decker Eu <superscript>III</superscript> octa-n-butoxyphthalocyaninates 5 and 6 and their mixtures with trioctylphosphine oxide-capped QDs are also synthesized and studied. It is revealed that both lowering of molecular symmetry and expansion of the π-electron system upon moving from double- to triple-decker complexes significantly improves the OL characteristics, making the low-symmetry triple-decker complex 3 the most efficient optical limiter in the studied family of sandwich complexes, affording 50 % lowering of light transmittance below 0.5 J cm <superscript>-2</superscript> input fluence. Conjugation (both covalent and noncovalent) with QDs affords further enhancement of the OL properties of both double- and triple-decker complexes. Altogether, the obtained results contribute to the development of novel nonlinear optical materials for future nanoelectronic and optical device applications.<br /> (© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Details

Language :
English
ISSN :
1521-3765
Volume :
23
Issue :
12
Database :
MEDLINE
Journal :
Chemistry (Weinheim an der Bergstrasse, Germany)
Publication Type :
Academic Journal
Accession number :
28001325
Full Text :
https://doi.org/10.1002/chem.201604401