Chemical Bulletin of Kazakh National University
https://bulletin.chemistry.kz/index.php/kaznu
<p>Chemical Bulletin of Kazakh National University (ISSN 1563-0331, eISSN 2312-7554, abbreviated title: Chem. Bull. Kaz. Nat. Univ.) is the open-access journal publishing high-quality original scientific articles since 1992 (four issues per year). The Bulletin covers all areas of chemistry including the multidisciplinary chemistry. The journal aims to become international. It has the international Editorial Board and is open to authors from all around the world.</p> <p><span style="text-decoration: underline;">Advantages of publication in our Journal:</span></p> <ul> <li class="show">indexing in many databases (CAS, DOAJ, CrossRef, Web of Science) simplifies finding your article</li> <li class="show">free access to full text of your article (higher number of readers = more citations and higher h-index)</li> <li class="show">peer-review of the article by qualified experts improves it's overall quality and increases the probability of application of your results by other scientists</li> <li class="show">quick publication rates - article appears online with DOI one week after acceptance, final publication with numbers of issue and pages in 2 weeks (average). Total time after submission to publication - 10 weeks</li> <li class="show">continuous and active work of the Editorial team on the increase of the quality and the ranking of the Journal</li> </ul>Al-Farabi Kazakh National Universityen-USChemical Bulletin of Kazakh National University1563-0331<p>Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a <a href="https://creativecommons.org/licenses/by-nc-nd/4.0/" target="_new">Creative Commons Attribution License</a> (CC BY-NC-ND 4.0) that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.</p>Thermal treatment of model water-in-oil emulsions by coal fly ash particles
https://bulletin.chemistry.kz/index.php/kaznu/article/view/1392
<p>One of the primary challenges in the oil industry is the formation of stable crude oil emulsions, which cause equipment and pipeline corrosion due to the inorganic salts dissolved in the aqueous phase. This study investigated the effect of coal fly ash on model crude oil emulsions. The model emulsions were prepared using crude oil samples from the Kyzylorda and Atyrau regions. Thermal demulsification at 60°C resulted in a low dewatering rate, with only 16% of water separated from a 50% water-in-oil emulsion. Higher efficiency in oil emulsion separation was observed using the microwave treatment method. The highest dewatering degree was achieved for the Atyrau crude oil emulsion, reaching 75% after 155 seconds for a 50% emulsion with a 1% ash concentration at a microwave power of 700 W, while the dewatering for the Kyzylorda oilfield emulsion was 50% under the same conditions. This difference in demulsification efficiency is attributed to the composition of the crude oil samples. It has been demonstrated that the microwave treatment method combined with the use of coal fly ash enables the separation of water-in-oil emulsions within a short period.</p>Saidulla N. FaizullayevErik SailaubayAkbota O. Adilbekova
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2025-04-052025-04-05114110.15328/cb1392Mіnі-rеvіеw: Advаnсеs іn thе sуnthеsіs аnd bіоlоgісаl асtіvіtу оf bеnzоfurохаn аnd furохаn dеrіvаtіvеs
https://bulletin.chemistry.kz/index.php/kaznu/article/view/1391
<p>Benzofuroxan and furoxan derivatives are heterocyclic compounds well known for their ability to act as nitric oxide (NO) donors. Due to their NO-releasing properties, these compounds have attracted considerable attention for their antimicrobial, antiviral, and antitumor activities. Their potential use in treating cardiovascular, gastrointestinal, and neurodegenerative disorders further underscores their pharmacological relevance. Given the increasing research interest in these compounds, there is a need to consolidate recent findings related to their chemical properties and biological potential. This mini-review aims to provide an up-to-date overview of the synthetic strategies and bioactivities of benzofuroxan and furoxan derivatives. Rather than focusing on ring synthesis, this review highlights the reactivity of side-chain functional groups and the design of hybrid molecules. Representative examples of drug-like compounds are discussed, along with their biological profiles. The review also explores emerging directions in the development of novel NO donors based on these frameworks with improved pharmaceutical efficacy and controlled NO release.</p>Mukhtar N. ZhаnаkоvZhanna K. ZhatkanbayevaElena A. СhugunоvаNurgali I. AkylbekovYerlan Ye. Zhаtkаnbауеv
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2025-04-052025-04-05114110.15328/cb1391Synthesis, electronic and emission spectroscopy of diphenylamine-azulene co-oligomers
https://bulletin.chemistry.kz/index.php/kaznu/article/view/1397
<p>New strategies for creating functional materials are of great interest for the further development of optoelectronic devices such as organic field-effect transistors (OFETs), organic light emitting diodes (OLEDs), dye-sensitized organic solar cells (DSSCs) and others. In this area, research has focused on the application of various building blocks that can fine-tune the electronic structure of materials to optimize the fabrication performance and morphology. To date, the most effective molecules as building block are aromatic hydrocarbons, for example azulenes. <br>In this study, new conjugated diphenylamine-azulene co-oligomers with linear and branched structures were synthesized with high yields via the Suzuki–Miyaura cross-coupling reaction. The obtained co-oligomers exhibit a pronounced ability to absorb and emit visible light in the 400–700 nm range. It was demonstrated that these unique photophysical properties, particularly the intense emissions in the green and orange photoluminescence range, result from the electron-donating properties of diphenylamine groups and the expansion of π-conjugation, which significantly alters the electronic structure of azulene, including the levels and energy gaps of the frontier HOMO-LUMO orbitals. These findings provide a rational approach to designing a series of new conjugated co-oligomers based on diphenylamine-azulenes for optoelectronic and photonic devices.</p>Nurlan MerkhatulyAblaykhan N. IskanderovSaltanat B. AbeuovaAmantay N. IskanderovGulpan M. KadirberlinaAinur S. SeitkanArailym M. Kemelbekova
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2025-04-052025-04-05114110.15328/cb1397