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| Title: | COMPETITION IN THE FORMATION OF NANOSIZE MULTIPORPHYRIN COMPLEXES AND PORPHYRIN-QUANTUM DOT HETEROCOMPOSITES | |
| DOI No: | 10.1142/9789812701947_0081 | |
| Source: | PHYSICS, CHEMISTRY AND APPLICATION OF NANOSTRUCTURES (pp 367-370) | |
| Author(s): | E. I. ZENKEVICH
Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, F. Skaryna Avenue 70, 220072 Minsk, Belarus A. M. SHULGA Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, F. Skaryna Avenue 70, 220072 Minsk, Belarus T. BLAUDECK Institute of Physics, University of Technology Chemnitz, Reichenhainer Str. 70, 09107 Chemnitz, Germany F. CICHOS Institute of Physics, University of Technology Chemnitz, Reichenhainer Str. 70, 09107 Chemnitz, Germany C. VON BORCZYSKOWSKI Institute of Physics, University of Technology Chemnitz, Reichenhainer Str. 70, 09107 Chemnitz, Germany |
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| Abstract: | In solutions of variable polarity at 77-293 K, non-covalent binding interactions via the key-hole scheme “Zn–pyridyl” have been used for the formation of porphyrin triads and pentads as well as for the surface passivation of pyridyl–substituted tetrapyrroles on the core– shell semiconductor CdSe/ZnS quantum dots (QDs). CdSe/ZnS QD emission quenching by attached porphyrins (due to energy and/or charge transfer) depends strongly on the number of anchoring groups, their arrangement in the porphyrin molecule as well as on QD size and number of ZnS monolayers. Simultaneous presence of porphyrin triads/pentads and QDs in a solution leads to an equilibrium competition between multiporphyrin complex formation (complexation constant KC ≈ 2·107 M−1 for 1:1 interaction) and appearance of CdSe/ZnS QDs passivated by pyridyl–substituted porphyrins (KC ~ 107 M−1 for one QD and number |
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| Full Text: | View full text in PDF format (227KB) | |
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