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The formation of an ion-association complex by the interaction of iodotellurate(IV) with cetyltrimethylammonium bromide is used as the basis of an extractive procedure to determine tellurium in the range 2.5-12.5 mug in a final aqueous phase volume of 20 ml. The method is simple, reliable and sensitive. Selectivity is achieved by separation of tellurium on aluminium hydroxide as collector.
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http://dx.doi.org/10.1016/0039-9140(79)80074-0 | DOI Listing |
Molecules
August 2025
Department of Chemical Sciences, Faculty of Pharmacy, Medical University of Plovdiv, 120 Buxton Bros Str., 4004 Plovdiv, Bulgaria.
A novel centrifuge-less cloud point extraction (CL-CPE) method was developed for the spectrophotometric determination of copper(II) using 4-nitrocatechol (4NC) as the chelating agent. The extraction system utilizes a mixed micellar phase composed of the nonionic surfactant Triton X-114 and the ionic liquid (IL) Aliquat 336 (A336). The extracted ternary ion-association complex, identified as (A336)[Cu(4NC)], exhibits a maximum absorbance at 451 nm, with a molar absorption coefficient of 8.
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June 2025
Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia.
Receptors capable of binding both positive and negative ions are an important domain of supramolecular chemistry with valuable application potential. A Complete thermodynamic description of the equilibria related to ion pair recognition is beneficial in developing the optimized receptor systems, although it represents a difficult task that is rarely resolved due to various coupled processes. Here, we present a comprehensive study of ion pair (NaCl, NaHSO, and NaHPO) binding by a ureido-amide calix[4]arene host in acetonitrile using a series of experimental techniques and molecular dynamics simulations.
View Article and Find Full Text PDFPhys Chem Chem Phys
June 2025
Department of Biotherapy, Cancer Center and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, P. R. China.
Inorganic mineral/collagen composite materials are one of the most attractive implant materials for bone repair engineering. Mineralized collagen composites have a similar hierarchical structure and biological activity to natural bone; however, the mechanism of the mineralization process is complex, and the properties of mineralized materials are difficult to control during the preparation process. Currently, this is a significant challenge in coarse-grained organic-inorganic systems.
View Article and Find Full Text PDFBMC Chem
May 2025
Department of Pharmaceutical Chemistry, College of Pharmacy, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia.
Acrylamide (ACM) is a food processing contaminant classified as a probable genotoxic and carcinogenic substance for humans. The rapid and economical determination of ACM in food products poses a major challenge for food safety. This research intended to fabricate a simple, selective, and cost-effective polymeric-coated graphite sensor.
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April 2025
Department of Inorganic Chemistry, Uzhhorod National University, 88000 Uzhhorod, Ukraine.
The elimination of absorbance of excess dye by selective oxidation was first proposed for analytical methods using the formation of ion-association complexes (IAs). On this basis, a new sensitive and selective spectrophotometric method for the determination of phosphate in the form of the IA of 11-molybdovanadophosphate with diindodicarbocyanine (DIDC) was developed. Symmetric diindodicarbocyanine and diindotricarbocyanine dyes can be completely oxidized by sufficiently strong oxidizing agents such as permanganate, dichromate, cerium (IV), and vanadate.
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