| Autor: |
Karmakar M; Department of Chemistry, Jadavpur University, Kolkata 700032, India., Pal A; Department of Chemistry, Jadavpur University, Kolkata 700032, India., Mondal B; Institut für Anorganische Chemie, Universität Regensburg, Universitätsstrasse 31, 93040 Regensburg, Germany., Adarsh NN; Solid State and Materials Chemistry Research Group, School of Chemical Sciences, Mahatma Gandhi University, Kerala 686560, India., Thakur A; Department of Chemistry, Jadavpur University, Kolkata 700032, India. |
| Jazyk: |
angličtina |
| Zdroj: |
Inorganic chemistry [Inorg Chem] 2021 Apr 19; Vol. 60 (8), pp. 6086-6098. Date of Electronic Publication: 2021 Apr 08. |
| DOI: |
10.1021/acs.inorgchem.1c00602 |
| Abstrakt: |
The C 2 -symmetric photochromic molecule 3 , containing dithienylethene (DTE) and ferrocene units connected by an alkyne bridge, represents a unique probe where a metal (Hg 2+ ) binds with the central DTE moiety. Both photoisomerized states of 3 (open, 3o ; closed, 3c ) are found to interact with Hg 2+ ion by the S atoms of the DTE core; however, the binding constants (from a UV-vis study) and DFT calculations suggest that the open isomer ( 3o ) binds with the metal ion more strongly than that of the closed isomer ( 3c ). Notably, the course of metal binding does not perturb the inherent photoisomerization properties of the DTE core and the photoswitchability persists even in the metal-coordinated form of 3 , however, with a comparatively slower rate. The quantum yields for photocyclization (Φ o→c ) and photocycloreversion (Φ c→o ) in the free form are 0.56 and 0.007, respectively, whereas the photocyclization quantum yield in the Hg 2+ complexed species is 0.068, 8.2 times lower than the photocyclization quantum yield (Φ o→c ) of free 3o. Thus, the rate of photoisomerization can be modulated by a suitable metal coordination to the DTE core. The dynamics of photoswitchability in the metal-coordinated form of DTE has been explored by experimental means (UV-vis and electrochemical studies) as well as quantum chemical calculations. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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