Chemistry Journal of Moldova

 

DOI: http://dx.doi.org/10.19261/cjm.2022.973

 

Graphical Abstract: This paper presents a study of the hydrochemical composition and physicochemical properties of natural water samples from various sources in the Voronezh and Moscow regions. Two model systems are proposed for assessing the state of the aquatic environment: UV spectroscopy with spectrum decomposition by the Gauss method and spontaneous aggregation of lecithin in a polar medium. Based on the performed investigation, it was determined that the size of lecithin aggregates decreases, and the value of their zeta potential increases with an increase in the content of hydrophobic compounds in natural water.


 

DOI: http://dx.doi.org/10.19261/cjm.2022.980

 

Graphical Abstract: The aim of the work was to study the isomerization of limonene on zeolite-containing biporous acid catalysts based on kaolin (from Ukraine). Results of this study show that at 160°C, the maximum isomer yield was 60–65% with an 80–90% conversion. The studied samples do not have a significant accumulation of carbonaceous deposits because limonene has high solubility, which helps to remove intermediate products of transformation from the surface of the samples. 


 

DOI: http://dx.doi.org/10.19261/cjm.2022.954

 

Graphical Abstract: Two coordinating compounds of zinc(II) (1) [Zn₂(DAnH₂)₂(1,3-bdc)₂(DMSO)₄] and nickel(II) (2) [Ni(DAnH₂)(1,4-bdc)(DMF)₂]_n were obtained based on dianilineglyoxime (DAnH₂), 1,3-benzenedicarboxylic acid (1,3-bdcH₂) and 1,4-benzenedicarboxylic acid (1,4-bdcH^₂), where DMSO is dimethylsulfoxide and DMF is dimethylformamide. The molecular and crystalline structure of reported compounds were established by infrared spectroscopy and single crystal X-ray diffraction, and for 1, additionally, the ¹H and ¹³C NMR spectroscopy was used. According to data, the Zn(II) molecular complex is a binuclear and the Ni(II) is a 1D polymer compound. 


 

DOI: http://dx.doi.org/10.19261/cjm.2022.957

 

Supplementary Material (PDF)
Graphical Abstract: 6-Chloro-2-ferrocenyl-1H-benzimidazole and (E)-((4-chloro-2-hydroxyphenylimino)methyl)ferrocene ligands and their Fe(III), Co(II), Cu(II), Zn(II) and Pd(II) complexes were synthesized. The structure of ligands and metal complexes has been investigated by different methods. In addition, magnetic moment, molar conductivity measurements and antibacterial activity of the ligands and the complexes were investigated.


 

DOI: http://dx.doi.org/10.19261/cjm.2022.984

 

Graphical Abstract: The work was aimed at preparing the CA+A300 composite consisting of caffeic acid (CA) and fumed silica (A300) and at comparing the properties of CA in the solution and in the composite. The results showed that the solution and the composite are effective antioxidant/antimicrobial agents and that inclusion of CA in the CA+A300 composite provides its gradual release into solutions and reaction mixtures, thus ensuring a prolonged action of the compound.


 

DOI: http://dx.doi.org/10.19261/cjm.2022.942

 

Graphical Abstract. In this work new methods to obtain complexes from β-cyclodextrin and dehydroabietic acid with chromenol-triazol hybrid with the sizes limits of approximately 0.1-250 μm are reported. Kneading, co-evaporation and co-precipitation for the resolution of racemic 2-tert-butyl-3-(1H-1,2,4-triazol-1-yl)-2H-chromen-2-ol for obtaining micro- and nanoparticles have been optimized. In vitro dissolution studies of the synthesized compounds in phosphate buffer (pH 6.8) showed an improved dissolution rate of chromenol-triazol hybrid in the inclusion complexes compared to the free form. The obtained β-complexes of β-cyclodextrin loaded with dehydroabietitoic acid and chromenol hybrid showed good antibacterial activity with MIC and MBC values ranging from 0.72 to 44.45 μM.