##IMG## [http://ej.iop.org/images/0036-021X/89/9/897/rc4940c.gif] The results of studies on the hydrogen accumulation, storage and release systems differing in the type of hydrogen interaction with the material (medium) used for hydrogen storage are analyzed. Published data on the use of polycyclic hydrocarbons as the basis for hydrogen storage in a chemically bound state are summarized. Substrate

##IMG## [http://ej.iop.org/images/0036-021X/89/9/966/rc4949c.gif] Published data on the coordination compounds of group 5 metals with diimine type ligands are surveyed. Methods of synthesis, structural types, reactivity and properties of these compounds are summarized and systematized. Particular attention is paid to the redox, magnetic and catalytic properties and to biological activities of these

##IMG## [http://ej.iop.org/images/0036-021X/89/9/917/rc4931c.gif] Syntheses of polyfunctional benzene derivatives from both cyclic and acyclic non-aromatic precursors are reviewed. Such aromatizations include transformations that use Diels – Alder reactions, transition metal-catalyzed reactions, base mediated aldol or Michael addition reactions or electrocyclic and pericyclic reactions. This review

##IMG## [http://ej.iop.org/images/0036-021X/89/9/879/rc4954c.gif] The ageing of the world’s population is the result of increased life expectancy observed in almost all countries throughout the world. Consequently, a rising tide of ageing-associated disorders, like cancer and neurodegenerative diseases, represents one of the main global challenges of the 21st century. The ability of mankind to overcome

##IMG## [http://ej.iop.org/images/0036-021X/89/8/858/rc4961c.gif] The review summarizes the publications, available at the time it was written, addressing the chemical and biological processes that occur in the human body upon exposure to coronaviruses, in particular SARS-CoV-2. The mechanisms of viral particle entry into the cell, viral replication and impact on the immune system and on oxygen transport

##IMG## [http://ej.iop.org/images/0036-021X/89/8/787/rc4921c.gif] The review is devoted to cytokinins — classical plant hormones known for more than six decades. Nevertheless, different aspects of the action of cytokinins are still being investigated. Relevant studies produced interesting, often unexpected, results, which cast doubt on the old paradigms and open new prospects for the use of these phytohormones

##IMG## [http://ej.iop.org/images/0036-021X/89/8/811/rc4941c.gif] The review is devoted to the fundamental problems of physical chemistry and rheology posed in the analysis of stability loss of polymer jets in extension. Studies of phenomena occurring in deformation of polymeric fluids are of considerable applied interest because extension of polymeric fluids underlies many industrial processes, first

##IMG## [http://ej.iop.org/images/0036-021X/89/8/824/rc4943c.gif] The review summarizes and systematizes the literature data on a new promising application area of iron compounds, that is, catalysis of organic reactions. The considered reactions include halogenation, formation of C−C bonds with the participation of various substrates, new methods for the synthesis of ethers and aromatic and heteroaromatic

##IMG## [http://ej.iop.org/images/0036-021X/89/7/713/rc4909c.gif] Organic dyes are very promising substrates for modern sensing technologies. Their utility is based on the ‘push-pull’ polarization of a π-electron system, as well as their polyfunctionality. These properties make organic dyes capable of fluorescent sensory response to many analytes and provide different mechanisms of both fluorescence

##IMG## [http://ej.iop.org/images/0036-021X/89/7/693/rc4923c.gif] Molecular design of magnetically active graphene nanoscale structures is an emerging field of research. The key goal of this research is to produce graphene nanoribbons and graphene quantum dots with specified electronic, optical and magnetic properties. The review considers methods for the synthesis of spin-labelled polycyclic aromatic