Chemistry Journal of Moldova

2014 Volume 9, no.1

MIXED-METAL COMPLEXES OF MIXED-VALENT DINUCLEAR RUTHENIUM(II,III) CARBOXYLATE AND TETRACYANIDONICKELATE(II)

Author(s):

Masahiro Mikuriya, Yusuke Tanaka, Daisuke Yoshioka, Makoto Handa


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 93-99
Keywords: dinuclear ruthenium(II,III) carboxylate; magnetic property; mixed-metal complex; tetracyanido nickelate(II)
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Abstract (PDF)

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). 




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MIXED-VALENT TETRANUCLEAR MnIIMnIII3 COMPLEX WITH 1,3-DIAMINO-2-HYDROXYPROPANE-N,N’,N”,N”’-TETRAACETIC ACID

Author(s):

Masahiro Mikuriya, Nobuyuki Nagao, Satoshi Kurahashi, Atsushi Tabuchi, Seiki Tomohara, Motohiro Tsuboi, Daisuke Yoshioka, Hiroshi Sakiyama, Akira Fuyuhiro


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 100-105
Keywords: manganese complex; tetranuclear complex; magnetic property; mixed-valent complex
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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.


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STUDY OF PROPERTIES OF SOME POLYETHYLENE-CLAY NANOCOMPOSITES: INFLUENCE OF PREPARATION METHOD ON THE DEGREE OF CLAY INTERCALATION/EXFOLIATION

Author(s):

Fulga Tanasa, Madalina Zanoaga


Field: Organic chemistry
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 106-111
Keywords: polymer-clay nanocomposites, preparation, properties, exfoliation, intercalation
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Abstract (PDF)

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.



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HOLOGRAPHIC INFORMATION MEDIA BASED ON AZO-POLYMERS WITH DIFFERENT STRUCTURES

Author(s):

Irina Davidenko


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 112-116
Keywords: azobenzene, metallic polycomplexes, polymer composition, electrooptical effect, polarization holohraphy
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Abstract (PDF)

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.



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HOLOGRAPHIC RECORDING MEDIA BASED ON ELECTRONS DONOR OLIGOMERS

Author(s):

Nicolay Davidenko, Irina Davidenko, Nicolay Chuprina, Yuriy Getmanchuk., Leonid Kostenko, Elena Mokrinskaya, Valeriy Pavlov, Sergey Studzinsky, Larisa Tonkopieva


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 117-122
Keywords: carbazole, oligomer, photothermoplastic, holographic recording
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Abstract (PDF)

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.




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AMINOSILICA NANO- AND SUBMICROSPHERES: ANALYSIS OF FACTORS INFLUENCING MORPHOLOGY, STRUCTURE AND PROPERTIES

Author(s):

Inna Melnyk


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 123-127
Keywords: silica nanoparticles and submicrospheres, aminopropyl groups, Stöber method
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Abstract (PDF)

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.



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SYNTHESIS AND CHARACTERIZATION OF CdSe COLLOIDAL QUANTUM DOTS IN ORGANIC SOLVENT

Author(s):

Ion Geru, Olga Bordian, Constantin Loshmansky, Ion Culeac, Constantin Turta


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 128-131
Keywords: colloidal quantum dots, semiconductor, cadmium selenide, nanocrystals, photoluminescence
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Abstract (PDF)

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: 90

BIOMATERIALS BASED ON NANOHYDROXYAPATITE

Author(s):

Gabriela Ciobanu, Constantin Luca, Octavian Ciobanu


Field: Supramolecular chemistry
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 132-135
Keywords: hydroxyapatite, cellulose acetate, scaffold
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Abstract (PDF)

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: 35