Relating Excited States to the Dynamics of Macroscopic Strain in Photoresponsive Crystals.

Autor: Ahmed E; Smart Materials Lab, New York University, Abu Dhabi, POB 129188, Abu Dhabi 00000, U.A.E., Chizhik S; Institute of Solid State Chemistry and Mechanochemistry SB RAS, ul. Kutateladze, 18, Novosibirsk 630128, Russian Federation.; Novosibirsk State University, ul. Pirogova, 2, Novosibirsk 630090, Russian Federation., Sidelnikov A; Institute of Solid State Chemistry and Mechanochemistry SB RAS, ul. Kutateladze, 18, Novosibirsk 630128, Russian Federation., Boldyreva E; Novosibirsk State University, ul. Pirogova, 2, Novosibirsk 630090, Russian Federation.; Boreskov Institute of Catalysis SB RAS, pr. Lavrentieva, 5, Novosibirsk 630090, Russian Federation., Naumov P; Smart Materials Lab, New York University, Abu Dhabi, POB 129188, Abu Dhabi 00000, U.A.E.
Jazyk: angličtina
Zdroj: Inorganic chemistry [Inorg Chem] 2022 Feb 28; Vol. 61 (8), pp. 3573-3585. Date of Electronic Publication: 2022 Feb 16.
DOI: 10.1021/acs.inorgchem.1c03607
Abstrakt: Exposure of a photoreactive single crystal to light with a wavelength offset from its absorption maximum can have two distinct effects. The first is the "direct" effect, wherein the excited state generated in individual chemical species is influenced. The second is the "indirect" effect, which describes the penetration of light into the crystal and hence the spatial propagation and completeness of transformation. We illustrate using the nitro-nitrito isomerization of [Co(NH 3 ) 5 NO 2 ]Cl(NO 3 ) as an example that the direct and indirect effects can be independently determined. This is achieved by comparing the dynamics of macroscopic crystal deformation (bending curvature and crystal elongation) induced by the photochemical reaction when irradiating a crystal at the absorption maximum and at different band edges (above or below the maximum) of the same band. Quantitative description of the macroscopic strain dynamics in comparison with experiments allowed us to suggest that irradiation at different tails of the same absorption band causes isomerization to proceed via different excited states and an additional photochemical reaction (presumably, reverse nitrito-nitro isomerization) can occur on irradiation at the ligand-field band edges.
Databáze: MEDLINE
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