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Structure and photonics of merocyanines as a basis for development of light-sensitive materials

Work number - M 34 AWARDED

Presented Institute of Organic Chemistry of NAS of Ukraine.

Kulinich Andrii Volodymyrovych — doctor of chemical sciences, senior researcher at the Department of Color and Structure of Organic Compounds in Institute of Organic Chemistry of NAS of Ukraine.

The series of works presents the synthesis and complex study of merocyanine series, in which all the key structural parameters – donor-acceptor properties of the end-groups and the polymethine chain length – have been consistently varied. With the wide use of spectral measurements and quantum chemical calculations, general regularities have been revealed, relating the spectral-fluorescent properties of merocyanines with their structure in the gas phase, liquid and solid solutions, crystal state, and in the presence of various nanoparticles. The received data have allowed to develop the scientific base for design of merocyanines with desired properties, to create the chromophores whose intensive absorption and fluorescence bands lie in the important near IR spectral range, as well as merocyanines with near-record solvatochromism, for which not only color but also fluorescence quantum yield depend regularly and heavily on the solvent polarity.

Innovative approaches for the modification of spectral-fluorescent properties of merocyanines in the presence of nanodiamonds, carbon nanotubes and metallic plasmon nanoparticles are proposed, opening new possibilities for their application.

Among the synthesized merocyanines, many structures have been identified as promising components of light-sensitive materials for photothermoplastic holo­graphy, photovoltaics, and electroluminescence. Correlation equations that provide a quick and accurate estimate of the position of the frontier orbitals of polymethine dyes of various structure have been suggested.

Merocyanine-sensitized polymeric photoconductive holographic media for non-destructive testing – highly selective and not requiring scattered light protection – have been developed (UA patent 100823). Their diffraction efficiency is up to 25% and the information characteristics do not deteriorate upon 500 recording-erasure cycles. Photovoltaic media have been created based on merocyanines and carbazole-containing polymers (UA patent 115954). Active laser media based on merocyanines and silver nanoparticles, which are characterized by a low generation threshold and high efficiency, have been created.

Number of publications: 56 papers [among them 53 in Scopus-rated publications, 29 in Q1 and Q2 journals], the practical significance of the work is confirmed by 2 patents of Ukraine. The total number of citation to these publications is 568 by Scopus, 575 by Web of Science, and 837 by Google Scholar. The Hirsch number (h-index) of the author, Kulinich A. V. is 13 according to Scopus and Web of Science databases, 17 according to Google Scholar.