Vladimir Pomogaev

Photochromism inheritance in complexes containing spiropyran derivatives

Vladimir Pomogaev, PhD
Leading researcher in the Photophysics and Photochemistry of Molecules laboratory,
Department of Physics at Tomsk State University, 1 Novosibornaya sq., Tomsk, Russia, 634050
Abstract for seminar 19.09.2018 at the Chemical Department of KNU
The nanophotochromism is associated with the synthesis and investigation of photocontrolled hybrid compounds that are composited from photochromic organic fragments and nanoparticles of different morphologies and sizes in accordance with growing technological requirements of modern molecular electronics and photonics devices.
The present research deals with spectral-luminescnce, photophysical and isomerization properties of hybrid molecular compounds, which consist of photochromic spiropyran derivatives bonded to the surface of the carbon allotropes or embedded into protein sequences. QM calculation and analysis of the channels and mechanisms to convert excited spiropyran forms to merocyanine phases of individual photochromic moieties in comparison with the corresponding hybrid compounds were applied. Potential multiscale methods to investigate transitions, dissipations and transfer of excited states in such and other structures of combination chromophore fragments with nanostructures are discussed.
The role of n states provided by lone pairs of substituents for changing of the electronic structure and photochromic properties of spiropyran derivatives was evaluated. The S(spiro)  transition n* states  S(mero) channel for photo-transformation of the complex with nitro substituted spiropyran moiety is established and compared with the similar hybrid compounds combined with halogenated spiropyran where photoisomerisation doesn’t process.