[en] Results of investigation of the phototransformation dynamics of chromone molecules by means of a transient-state spectroscopy are presented. Changes in the spectrum of the optical density of chromone compounds dissolved in toluene in the process of their phototransformation are obtained on a time scale ranging from several hundred femtoseconds to several hundred picoseconds. Relaxation of an induced absorption spectrum is described by a biexponential function with characteristic time constants on the order of several picoseconds and several nanoseconds. A scheme of the phototransformation dynamics of chromone molecules corresponding to the observed dynamics of absorption spectra is proposed.

[en] One of the promising directions, which have already been applied in many technological processes in manufacturing electronic components and devices, is the use of organic polymer materials. Continuous improvement of electronics and widening the scope of its application has led to strengthening of the requirements to materials used in its production. Polymer materials must possess a set of properties providing efficiency, reliability, and longevity of such devices. Such requirements include thermal stability at temperatures of up to 300–400°C, dielectric properties, optical transparency in the UV, visible, and near-IR ranges, chemical stability, etc. This review article covers the available information on existing polymer materials on the basis of benzocyclobutene and its derivatives, and their physicochemical properties. Comparative evaluation of materials on the basis of benzocyclobutene and its derivatives, including analogs, is made, and their application in electronic devices is described.