To study the influence of structural features of phthalocyanine (Pc) derivatives on their physico-chemical properties in bulk and thin films, 23 new phthalocyanines with different quantity and ratio of donor (alkyloxy-groups, in fragment “A”) and acceptor (Cl-, in fragment “B”) substituents in one molecule of the A3B, ABAB and AABB types with varied length of alkyloxy-substituents and their metal complexes were designed and synthesized. A comparative analysis of spectral, mesomorphic and photoelectric properties of these mix-substituted phthalocyanines of a “push–pull” type was performed. It was shown that non-peripheral substitution by alkyloxy-fragments in hetero-substituted Pcs (similar to homo-substituted Pc) leads to red-shifting of the Q-band into near-IR region. The intensity of photoluminescence, position of peaks and their splitting are strongly connected with chemical structure of Pcs and the type of solvent. In contrast to non-mesogenic octyloxy-Pc (A4) having alkyloxy-substituents in non-peripheral positions, 22 of 23 synthesized compounds possess columnar mesomorphism. The change of donor–acceptor ratio can influence the type of mesophase. A new approach to the creation of materials for optoelectronics is proposed and implemented, which includes design of compounds possessing vitrification from mesophase with maintenance of a columnar order, absorption in the near IR-region of the spectrum and good performance electrophysical characteristics simultaneously.
The most important item of city activity is to define development directions. Because of strategic character of this issue, a very important thing is inhabitants’ contribution in decision making. Cooperation between them and city authorities should lead to positive changes in the city and inhabitants’ life quality. They learn social engagement when taking part in determining of city development directions. Showing their creativity and building social relationships in city area. The aim of the paper was determining problems of participation in the describing of city development directions process. In the research there were used several methods: literature studies, logical construction, deduction and observations.
Monorchism in children can be caused by congenital and acquired conditions, and can potentially infl uence the hormonal and reproductive function of an individual in the long term. Depending on the etiology, diff erent approaches to the solitary testis have been suggested; however, studies on this topic are scarce. Prevention of anorchia is the main goal in the management of a child with monarchism. The risk of bilateral testicular loss must be weighed against the risk of performing surgery on a healthy gonad. Little is known about the long-term consequences of the various methods for fixation of the testis. This paper provides an up-to-date summary of the current literature on congenital and acquired monarchism in childhood.