Chemistry Journal of Moldova

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DOI: dx.doi.org/10.19261/cjm.2009.04(2).02

Graphical Abstract: The paper explores the use of differential scanning calorimetry (DSC) and temperature modulated differential scanning calorimetry (TM DSC) to study α- and β- processes in amorphous sucrose and trehalose. The real part of the complex heat capacity is evaluated at the frequencies, f, from 5 to 20mHz. β-relaxations were studied by annealing glassy samples at different temperatures and subsequently heating at different rates in a differential scanning calorimeter.


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DOI: dx.doi.org/10.19261/cjm.2009.04(2).04

Graphical Abstract: The binding of para-Sulphonato-calix[4]arene to a series of Serum Albumin Proteins has been studied using Electrospray Mass Spectrometry, each protein shows different capacities to interact with para-Sulphonato-calix[4]arene, including the number of ligands bound, the Association Constants observed, and the stoichiometries at which the onset of each binding event is observed.


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DOI: dx.doi.org/10.19261/cjm.2009.04(2).05

Graphical Abstract: Diamino-bicycloundecane mono-deprotonates H-calix[4]arene and the solid-structure of the resulting salt has been determined by X-ray crystallography. Two different complexes are present in the structure with the Diamino-bicycloundecane cation held in the calix[4]arene cavity by CH-p interactions. In the packing there is a hydrogen-bonded polymeric chain. Both the complexes formed layered structures with differing inter-layer distances. 


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DOI: dx.doi.org/10.19261/cjm.2009.04(2).06

Graphical Abstract: Substituted indolizines are very attractive heterocyclic units. On developing efficient methods toward differently substituted indolizines, we were particularly interested in elaborating efficient approaches toward three-component reaction of these compounds which are very interested from the point of view fluorescent properties. The microwave-mediated three component reaction of acyl bromide, bipyridine and dipolarophyl is catalyzed by basic alumina to give corresponding bis-indolizines in excellent yields in a one –pot reaction.


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DOI: dx.doi.org/10.19261/cjm.2009.04(2).09

Graphical Abstract: The complexes of general formula MCl₂∙L^1-4∙nH₂O (where L¹ - N-(2,4,7-trinitrofluorenilidene-9)-p-dimethyl-aminoanilin, L² - N-(2,4,5,7-tetranitrofluorenilidene-9)-p-dimethylaminoaniline, L³ - N-(2,4,7-trinitrofluorenilidene)-N-(p-dimethylaminophenyl)hydroxylamine, L⁴ - N-(2,4,5,7-tetranitrofluorenilidene-9)-N-(p-dimethylaminophenyl)-hydroxylamine; M=Cu, Co, Ni, Zn; n= 1-3 have been synthesized and investigated by different methods. Spectral criteria of co-ordination of the molecules L¹ –L⁴ in electronic adsorption spectra were detected.


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Abstract (JPEG)

DOI: dx.doi.org/10.19261/cjm.2009.04(2).10

Graphical Abstract: Nine new complexes with the general formula {[Ln₂Ba(α-Fur)₈(H₂O)₄]}_n, where Ln = Nd³⁺, Sm³⁺, Eu³⁺, Pr³⁺, Gd³⁺, Tb³⁺, Ho³⁺, Er³⁺ and La³⁺; α-Fur ≡ C₄H₃OCOO, were synthesized and characterized by IR spectra, magnetism, X-ray single crystal and powder diffractions.


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