Journal of Thermal Analysis and Calorimetry - New coordination compounds have been synthesized by reacting Zn(II) and Co(II) nitrate or acetate in the presence of triethylamine with Schiff-base... 相似文献
Summary Dimethyldichlorosilane and stearic acid chloride were used for deactivation of hydroxyl functional groups present in the skeleton
of the methacrylic ester ofp,p′-dihydroxydiphenylpropane diglycidyl ether-divinylbenzene, porous copolymer used as HPLC packing. The influence of chemical
modification on the chromatographic behaviour of the copolymer was studied. To characterize selectivity of the packings, retention
indices of five homologous series and test compounds were determined. The data obtained suggest that modification with stearic
acid chloride affects both the chemical and porous structure of the copolymer while modification with dimethydichlorosilane
changes only the chemical character of the packing. 相似文献
The new complexes of 2-[(2-oxo-1,2-dihydroindol-3-ylidene)amino]butanoic acid, LH (where L = C12H11N2O3), with Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) of general formulae MLCl·nH2O, for Co(II), Ni(II) and Cu(II), and ML2·H2O for Mn(II) and Zn(II), where n = 1, 2 depending on M(II) ions, are synthesized. The complexes crystallize in a monoclinic system, and upon heating in the air (293–1173 K) decompose in three steps forming eventually the corresponding oxides of the metals(II). In the course of this process the organic ligand decomposes releasing the molecules of H2O, CO2, NH3, CO, hydrocarbons, and additionally HCl for Co(II), Ni(II) and Cu(II) complexes. Magnetic moments of compounds are determined in the ranges of 76–303 and 2–300 K. All analyzed compounds, except that of Zn(II), demonstrate the paramagnetic properties with the ferro- and antiferromagnetic interactions between molecular centres.
The influence of chemical structure of porous polymers on the chromatographic properties of high-performance liquid chromatography columns was studied. Columns were packed with four different porous copolymers: di(methacryloyloxymethyl)naphthalene-divinylbenzene containing ester functional groups, 4,4'-bis(maleimido)diphenylmethane-divinylbenzene with imide groups, di(4,4'-dimethacrylphenyl)sulfone-divinylbenzene which contains sulphonyl groups, and styrenedivinylbenzene with any functional groups. Using the alkyl aryl ketone scale, the retention indices of five homologous series (alkylbenzenes, alkyl aryl ketones, N-alkylanilines, alkyl aryl ethers, alkylbenzoates) and column test compounds (toluene, nitrobenzene, p-cresol, 2-phenylethanol, N-methylaniline) were calculated. Their values were used for comparison of the selectivities of the studied polymeric packings. 相似文献
Russian Journal of General Chemistry - Complexes of 4-[(4-fluorophenyl)amino]-4-oxobut-2-enoic acid, HL, with Mn(II), Co(II), Ni(II), Cu(II), Nd(III), Gd(III), and Er(III) were synthesized and... 相似文献
Russian Journal of General Chemistry - 3,4-Dimethoxyphenylacetates of Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) of general formula M(C10H11O4)2·nH2O, where n = 1, 2 or 4 depending on M(II)... 相似文献
Summary The influence of Friedel-Crafts reaction on the properties of poly(styrene-divinylbenzene) porous copolymers was studied.
Two porous copolymers containing 0.7 and 0.9 mole fractions of divinylbenzene were used for modification. The aim of the process
was to increase the copolymer crosslinking. As a crosslinker, tetrachloromethane in the presence of aluminium chloride was
used. Reactions were monitored by FTIR and XRF analyses.
The main result of the modification process is the change of the copolymer porous structure. Modification also has an influence
on the chromatographic properties of the copolymers, especially selectivities. 相似文献