Chemistry Journal of Moldova

2018 Volume 13, no.1

IMPROVEMENT OF FILTRATION PROPERTIES OF GHIDIRIM DIATOMITE (REPUBLIC OF MOLDOVA)

Author(s):

Larisa Postolachi, Vasile Rusu, Tudor Lupascu, Oleg Petuhov


Field: Ecological chemistry
Type: Short communication
Issue: 2018 Volume 13, no.1
Pages: 117-121
Keywords: diatomite, alkaline treatment, filtration rate.
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DOI: http://dx.doi.org/10.19261/cjm.2018.436

Abstract (PDF) 
Graphical Abstract: The aim of the study was to modify the diatomite from Ghidirim village (Ribnita distinct, Republic of Moldova) with purpose to use it as filter material. The initial diatomite was modified by alkaline treatment with sodium carbonate, and the filtering capacity was evaluated by suction filtration method. The treatment of diatomite by sodium carbonate resulted in an increased filtration rate, recording the most pronounced filtering capacity for diatomite treated with 20% solution of sodium carbonate.


 

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SILVER NANOPARTICLES SYNTHESIZED USING LANTANA CAMARA FLOWER EXTRACT BY REFLUX, MICROWAVE AND ULTRASOUND METHODS

Author(s):

Is Fatimah, Nurul Indriani


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2018 Volume 13, no.1
Pages: 95-102
Keywords: silver nanoparticle, green synthesis, Lantana camara, microwave, ultrasound.
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DOI:
http://dx.doi.org/10.19261/cjm.2017.461  

Abstract (PDF) 
Graphical Abstract: Green synthesis of silver nanoparticles (AgNPs) using Lantana camara yellow flower extract via microwave irradiation and ultrasound methods was conducted. The research was aimed at evaluating the effect of the synthesis method and also the time of treatment during synthesis on the particle size and antioxidant and antibacterial activities of the AgNPs. Analysis of the nanoparticles was performed using UV-Vis spectroscopy, transmission electron microscope (TEM), particle size analyzer, and Fourier transform infrared spectroscopy (FTIR). The present results support the advantages of plant extract and the green method for the production of nanoparticles for further potential applications.

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WATER BINDING THROUGH POLYACRYLAMIDE HYDROGEL AND THE INFLUENCE OF ITS PRELIMINARY SATURATION BY ENOXIL

Author(s):

Volodymyr Turov, Viktor Bogatyrev, Tatiana Krupska, Mariia Galaburda, Tudor Lupascu, Igor Povar, Natalia Kokosha


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2018 Volume 13, no.1
Pages: 87-94
Keywords: cluster, Enoxil, 1H NMR spectroscopy, polyacrylamide gel, polymer linkage.
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DOI:
http://dx.doi.org/10.19261/cjm.2017.459  

Abstract (PDF) 
Graphical Abstract: The state of water in a polyacrylamide (PPA) gel has been studied by the 1H NMR spectroscopy. It is shown that the PAA gel can serve as a container for prolonged retention of the Enoxil preparation without changing its chemical composition. At the same time, the molecular structures of Enoxil bind strongly to polymer chains, probably due to the formation of hydrogen-bound complexes with amino and imino groups.

1 - initial dry PAA, 2 - hydrogel PAA, 
3 - hydrogel PAA-Enoxil

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LANTHANIDE COORDINATION COMPOUNDS WITH MONODENTATE COORDINATED β-DIKETONE HETEROANALOGUE - (2,2,2-TRICHLORO-N-(DIPIPERIDIN-1-YL-PHOSPHORYL)ACETAMIDE: SYNTHESIS AND SPECTRAL INVESTIGATIONS

Author(s):

Olena Litsis, Vladimir Ovchynnikov, Tatiana Sliva, Svitlana Shishkina, Vladimir Amirkhanov


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2018 Volume 13, no.1
Pages: 15-23
Keywords: lanthanide, carbacylamidophosphate, phosphoryl ligand, six-coordinate lanthanide complex, electronic spectrum.
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DOI:
http://dx.doi.org/10.19261/cjm.2017.466
 
Abstract (PDF)
Graphical Abstract: New mononuclear six-coordinate lanthanide coordination compounds [Ln (HL)3Cl3] (HL = (2,2,2-trichloro-N-(dipiperidin-1-yl-phosphoryl)acetamideCCl3C(O)N(H)P(O)[N(CH2)5]2, carbacylamidophosphate (CAPh) type ligand) have been synthesized from non-aqueous solutions. The complexes have been characterized by elemental analysis, spectroscopic methods (FTIR, 1H- and 31P-NMR, UV-Vis). The structure of [Sm(HL)3Cl3] has been further confirmed by single crystal X-ray diffraction analysis.

 
 

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SYNTHESIS OF NEW HOMODRIMANE SESQUITERPENOIDS CONTAINING DIAZINE, 1,2,4-TRIAZOLE AND CARBAZOLE RINGS

Author(s):

Gheorghe Duca, Aculina Aricu, Lidia Lungu, Nadejda Tenu, Alexandru Ciocarlan, Yacob Gutu, Ion Dragalin, Alic Barba


Field: Organic chemistry
Type: Research paper
Issue: 2018 Volume 13, no.1
Pages: 69-73
Keywords: sesquiterpenoids, N-substituted amides, heterocyclic amines, diazine, 1,2,4-triazole, carbazole, synthesis.
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DOI:
http://dx.doi.org/10.19261/cjm.2017.458   

Abstract (PDF) 
Graphical Abstract: The study describes the synthesis of 11-homodrim-6,8-dien-12-oic acid N-substituted amides containing diazine, 1,2,4-triazole and carbazole rings based on commercially available sclareolide. The mentioned compounds were prepared for the first time by interaction of the generated in situ acyl chloride with some heterocyclic amines: 2- and 4-aminopyrimidine, 2-aminopyrazine, 3-amino-1,2,4-triazole and N-aminocarbazole. Their structures were fully elucidated by elemental and spectral analyses (IR, 1H and 13C NMR).


 

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