Chemistry Journal of Moldova

DOI: dx.doi.org/10.19261/cjm.2014.09(1).11

Graphical Abstract: Mixed-metal chain complexes constructed from lantern-type dinuclear ruthenium(II,III) carboxylate unit and tetracyanidonickelate(II), (PPh₄)_n[Ru₂(O₂CCH₃)₄Ni(CN)₄]n•nH₂O (1) and (PPh₄)n[Ru₂{O₂CC(CH₃)₃}₄]_3n[Ni(CN)₄]_2n•2nH₂O (2), where very weak antiferromagnetic interaction is operating, were synthesized and characterized by elemental analysis and IR and UV-vis spectroscopies and temperature dependence of magnetic susceptibilities (4.5—300K). 





Downloads: 40

Abstract (PDF)

DOI: dx.doi.org/10.19261/cjm.2014.09(1).12

Graphical Abstract: Mixed-valent tetranuclear MnIIMnIII3 complex with 1,3-dimino-2-hydroxypropane-N,N’-N”-N”’-tetracetic acid, Ca₂[Mn₄{µ-OHO}(dhpta)₂(CH₃COO)₂], where considerable antiferromagnetic interactions are operating, was synthesized and characterized by elemental analysis and IR and UV-vis spectroscopies, temperature dependence of magnetic susceptibilities (4.5—300K), and single-crystal X-ray crystallography.



Downloads: 39

DOI: dx.doi.org/10.19261/cjm.2014.09(1).13

Graphical Abstract: Nanocomposites based on HDPE and HDPE-g-MA, as matrix, and nanoclay Cloisite 20A, as filler, were obtained by melt compounding and solution blending, and their properties were comparatively studied in order to establish the dependence of the clay degree of exfoliation/intercalation on the preparation procedure.




Downloads: 36

DOI: dx.doi.org/10.19261/cjm.2014.09(1).14

Graphical Abstract: Polarization sensitive holographic recording was accomplished in new synthesized azobenzene polymer composites with Co metallic polycomplexes of different structure.




Downloads: 26

DOI: dx.doi.org/10.19261/cjm.2014.09(1).15

Graphical Abstract: Information properties of recording media based on electrons donor oligomer of different structure for thermoplastic technique are investigated.





Downloads: 19

DOI: dx.doi.org/10.19261/cjm.2014.09(1).16

Graphical Abstract: Current paper focuses on the analysis of influence of main factors (stages of the synthesis, the ratio of the reacting components, the order of their introduction, the concentration of water and ammonia, the synthesis temperature) on the morphology, size and content of functional groups of aminosilicanano- and submicrospheres. The recommendations for the synthesis of particles with predetermined properties were done. It is shown, that the ratio of the reacting components mainly affects the content of 3-aminopropyl functional groups and the temperature of the hydrolytic polycondensation reaction - the size of the particles.




Downloads: 45

DOI: dx.doi.org/10.19261/cjm.2014.09(1).17

Graphical Abstract: In this paper we present experimental results on preparation and characterization of colloidal CdSe quantum dots in organic solvent. CdSe QDs were synthesized following a modified literature method.
CdSe QDs were isolated by adding acetone to the cooled solution followed by centrifugation.
CdSe QDs have been characterized by UV-Vis absorption and photoluminescent (PL) spectroscopy. The average CdSe particles size estimated from the UV-Vis absorption spectra was found to be in the range 2.28-2.92 nm which is in good agreement with PL measurements. 

Downloads: 99

DOI: dx.doi.org/10.19261/cjm.2014.09(1).18

Graphical Abstract: In this study, the porous hydroxyapatite-filled cellulose acetate scaffolds were prepared via dry-wet phase inversion method by dispersing hydroxyapatite nanoparticles in the polymeric matrix. The calcined hydroxyapatite prepared by wet precipitation method has the crystal size smaller than 50 nm. The unfilled and hydroxyapatite-filled cellulose acetate scaffolds have an asymmetric structure consisting of two layers, the dense top layer (active layer) supported by the porous sub-layer (substructure). The cross-sectional SEM images revealed that hydroxyapatite nanoparticles were well dispersed in the cellulose acetate matrix.



Downloads: 41