Chemistry Journal of Moldova

DOI: dx.doi.org/10.19261/cjm.2016.11(2).03   

 

DOI: dx.doi.org/10.19261/cjm.2016.11(2).01

 

Graphical Abstract: Adsorption of strontium ions from aqueous solutions on active carbons CAN-7 and oxidized CAN-8 has been studied. Obtained results showed that the adsorption isotherms for strontium ions from aqueous solutions are well described by the Langmuir and Dubinin-Radushkevich equations, respectively. The surface heterogeneity of activated carbons CAN-7 and oxidized CAN-8 has been assessed by using Freundlich equation.

 

Graphical Abstract: During of 2014 year, 60 soil samples at the point of 30 soil samples in the spring and 30 soil samples in autumn were taken from the locality of Fındıklı, Pazar and Sabuncular, where cultivation of green tea has been made in Rize (Turkey). The value of pH, organic matter content, and macro- and microelements amount were determined in sampled soils and the seasonal changes were investigated.

DOI: dx.doi.org/10.19261/cjm.2016.11(2).08

 

DOI: dx.doi.org/10.19261/cjm.2016.11(2).11

 

Graphical Abstract: The crystalline compounds (Hbipy)2[Ge(HCitr)2]•2H2O (1)  and [CuCl(bipy)2]2[Ge(HCitr)2]•8H2O (2) (where H4Citr is citric acid, bipy is 2,2ʹ-bipyridine) were obtained for the first time and their structures were determined by the single-crystal X-ray diffraction method. The two compounds were characterized by IR spectroscopy, thermogravimetric (TGA) and elemental analyses. In both compounds complex bic(citrato)germanate anion is formed, protonated 2,2'-bipyridine molecule and [Cu(bipy)2Cl]+ complex are cations in 1 and 2, respectively.

DOI: dx.doi.org/10.19261/cjm.2016.11(2).07

 

Graphical Abstract: 5,6-Dichloro/dimethyl-2-(2´,3´/2´,4´/2´,5´/3´,4´/3´,5´-dimethoxyphenyl)-1H-benzimidazoles were synthesized and characterized experimentally and theoretically. The optimized molecular geometry, zero point energy, dipole moment, ESE and charge distributions were calculated by Gaussian 09 using DFT method. The calculated energy values with ZPE correction and DFT show that the methyl derivatives are more stable than the chloro forms.

 

Supplementary Material (PDF)
Graphical Abstract: An eco-friendly and environmentally benign synthesis of 3,4,5-substituted furan-2(5H)-ones employing Iranian seedless barberry or zereshk (Berberis integerrima ‘Bidaneh’, Berberidaceae) as a biocatalyst was developed. The merits of this method include the environmentally friendly reaction conditions, simple operation, broad substrate, satisfied yields and generate less waste than the conventional chemical reagents.

 

Graphical Abstract: The feasibility of using Retama raetam, for the cationic dye (methylene blue) adsorption from simulated aqueous solution, has been investigated as a low cost and an eco-friendly adsorbent. The methylene blue maximum adsorption occurred at pH 8 and the lowest adsorption occurred at pH 2. The apparent equilibrium was reached after 120 min. Adsorption modelling parameters for Freundlich and Langmuir isotherms were determined and, based on R2, various error distribution functions.

 

Graphical Abstract: In this study, we have shown that FDDNP as a functional fluorescent biomarker has high performance in near-infrared region. The best predicted working wavelength belongs to Ti:sapphire laser (880 nm). The employed near-infrared (NIR) wavelengths reduce scattering and maximize tissue penetration.

 

DOI: dx.doi.org/10.19261/cjm.2016.11(2).05

 

Graphical Abstract: Geometry optimizations at the UBP86/6-311++G** level of electronic structure theory have been performed for DDT, β-hexachlorocyclohexane, and heptachlor organic polychlorides and their positive and negative ions. The geometry optimization of the obtained neutral intermediate molecules after the first and second reducing by two electrons show that the electrochemical dehalogenation of the organic poychlorides is sequential.