In this work we apply a combination of steady state and time resolved luminescence and absorption spectroscopies to investigate the excited-state dynamics of a recently developed molecular photoswitch, belonging to the hydrazone family. The outstanding properties of this molecule, involving fluorescence toggling, bistability, high isomerization quantum yield and non-negligible two-photon absorption cross section, make it very promising for numerous applications. Here we show that the light induced Z/E isomerization occurs on a fast <1 ps timescale in both toluene and acetonitrile, while the excited state lifetime of the Z-form depends on solvent polarity, suggesting a partial charge transfer nature of its low lying excited state. Time-resolved luminescence measurements evidence the presence of a main emission component in the 500–520 nm spectral range, attributed to the Z-isomer, and a very short living blue-shifted emission, attributed to the E-isomer. Finally, transient absorption measurements performed upon far-red excitation are employed as an alternative method to determine the two-photon absorption cross-section of the molecule.

Ultrafast processes triggered by one- and two-photon excitation of a photochromic and luminescent hydrazone / Iagatti, Alessandro; Shao, Baihao; Credi, Alberto; Ventura, Barbara; Aprahamian, Ivan; Di Donato, Mariangela. - In: BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY. - ISSN 1860-5397. - ELETTRONICO. - 15:(2019), pp. 2438-2446. [10.3762/bjoc.15.236]

Ultrafast processes triggered by one- and two-photon excitation of a photochromic and luminescent hydrazone

Credi, Alberto
;
2019

Abstract

In this work we apply a combination of steady state and time resolved luminescence and absorption spectroscopies to investigate the excited-state dynamics of a recently developed molecular photoswitch, belonging to the hydrazone family. The outstanding properties of this molecule, involving fluorescence toggling, bistability, high isomerization quantum yield and non-negligible two-photon absorption cross section, make it very promising for numerous applications. Here we show that the light induced Z/E isomerization occurs on a fast <1 ps timescale in both toluene and acetonitrile, while the excited state lifetime of the Z-form depends on solvent polarity, suggesting a partial charge transfer nature of its low lying excited state. Time-resolved luminescence measurements evidence the presence of a main emission component in the 500–520 nm spectral range, attributed to the Z-isomer, and a very short living blue-shifted emission, attributed to the E-isomer. Finally, transient absorption measurements performed upon far-red excitation are employed as an alternative method to determine the two-photon absorption cross-section of the molecule.
2019
Ultrafast processes triggered by one- and two-photon excitation of a photochromic and luminescent hydrazone / Iagatti, Alessandro; Shao, Baihao; Credi, Alberto; Ventura, Barbara; Aprahamian, Ivan; Di Donato, Mariangela. - In: BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY. - ISSN 1860-5397. - ELETTRONICO. - 15:(2019), pp. 2438-2446. [10.3762/bjoc.15.236]
Iagatti, Alessandro; Shao, Baihao; Credi, Alberto; Ventura, Barbara; Aprahamian, Ivan; Di Donato, Mariangela
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/702421
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