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1.
A. V. Piskunov A. V. Lado G. A. Abakumov V. K. Cherkasov O. V. Kuznetsova G. K. Fukin E. V. Baranov 《Russian Chemical Bulletin》2007,56(1):97-103
Oxidation of amalgamated magnesium metal with 3,6-di-tert-butyl-o-benzoquinone (1) in different aprotic organic solvents afforded magnesium catecholate and bis-o-semiquinolate complexes. The catecholate derivatives of magnesium CatMgL2 (Cat is the 3,6-di-tert-butyl-o-benzoquinone dianion, L = THF or Py) were synthesized in high yields in pyridine and tetrahydrofuran, respectively. The reactions
in diethyl ether or dimethoxyethane produced hexacoordinated metal bis-o-semiquinolates SQ2MgLn (SQ is the 3,6-di-tert-butyl-o-benzoquinone radical anion, L = Et2O, n = 2; L = DME, n = 1). The reaction with the use of toluene as the solvent gave a magnesium bis-o-semiquinolate complex containing the coordinated unreduced o-quinone molecule. The molecular structures of the [CatMgPy2]2 and SQ2Mg·DME complexes were established by X-ray diffraction.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 92–98, January, 2007. 相似文献
2.
Tatyana I. Shabatina 《Structural chemistry》2007,18(4):511-517
Formation of metastable complexes with different metal to mesogenic ligand ratio (M/L = 1/2 and 1/1) has been shown by IR–,
UV–Vis, ESR-spectroscopic techniques for low temperature co-condensation of some d- and f-block transition metals (Ag, Cu, Eu, Sm) and mesogenic derivatives of cyanobiphenyls. The Quantum chemistry calculations
have been carried out to study equilibrium structures of complexes. Biligand complex models with one and two metal atoms and
antiparallel disposition of two ligand molecules are considered. Relative spectral shifts and relative thermal stability of
complexes are discussed. 相似文献
3.
T. V. Koksharova 《Russian Journal of General Chemistry》2005,75(10):1659-1663
The complexation of cobalt(III), nickel(II), copper(II), and zinc(II) glycinates and glycylglycinates with 4-phenylthiosemicarbazide was studied. 相似文献
4.
G. Bruni V. Berbenni C. Milanese A. Girella P. Cofrancesco G. Bellazzi A. Marini 《Journal of Thermal Analysis and Calorimetry》2009,95(3):871-876
In this work the solid-state characterization of anhydrous D-mannitol has been performed: α and β modifications can be distinguished only by XRPD and FTIR as they show melting temperature
and enthalpy that are the same within the standard deviation. The understanding of the thermal behaviour of the δ form (obtained
by re-crystallization in acetone) has required XRPD experiments performed at variable temperature. This form during heating
undergoes a solid phase transition to α modification. By cooling a melted sample, under a wide range of experimental conditions,
a very fast crystallization occurs. Independently of the starting crystal form (β or δ form), the re-crystallization of D-mannitol from melt always leads to α form. 相似文献
5.
G. A. Abakumov V. K. Cherkasov T. N. Kocherova N. O. Druzhkov Yu. A. Kurskii M. P. Bubnov G. K. Fukin L. G. Abakumova 《Russian Chemical Bulletin》2007,56(9):1849-1856
New sterically hindered functionalized o-quinones were synthesized by the 1,4-nucleophilic addition of secondary cyclic amines to 3,6-di(tert-butyl)-o-benzoquinone. The ability of these o-quinones to form o-semiquinone complexes with transition and main-group metals was studied by ESR spectroscopy in solution.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1786–1793, September, 2007. 相似文献
6.
V. V. Dunina O. N. Gorunova Yu. K. Grishin L. G. Kuz’mina A. V. Churakov A. V. Kuchin J. A. K. Howard 《Russian Chemical Bulletin》2005,54(9):2073-2082
The reaction of benzylaminate CN-palladacycle with chlorine dioxide was found to produce the 3-chlorine-substituted analog through the formal insertion of
chlorine into the Pd-C bond followed by repeated ortho-palladation of the modified ligand. The structure of the resulting dimeric complex was confirmed by X-ray diffraction study
of its triphenylphosphine derivative. A comparison of the 1H NMR spectra of the phosphine adducts of the starting and chlorinated complexes shows high conformational stability of the
new palladacycle. Advantages of the new route to conformational stabilization of labile palladacycles are discussed.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 2010–2019, September, 2005.
Dedicated to Academician N. S. Zefirov on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 2010–2019, September, 2005. 相似文献
7.
Anita Kovács I. Csóka Magdolna Kónya E. Csányi A. Fehér I. Erős 《Journal of Thermal Analysis and Calorimetry》2005,82(2):491-497
Summary The properties of the inner and the external aqueous phases, were studied in w/o/w multiple emulsions with light microscopic image analysis and differential scanning calorimetry (DSC). The importance of multiple
emulsions lies in the presence of these aqueous phases, making them available for sustained, controlled drug delivery systems.
Differentiation of these two aqueous phases, studying the effect of manufacturing technology on droplet structure, quantitative
determination of phase volumes and any changes occurring during storage are essential when planning w/o/w emulsions. The present study uses microscopic observations combined with DSC measurements in order to identify the formed
structure, at developmental stage in case of different components, preparation methods, and stirring rates. These tools are
beneficial during manufacturing as in process controls, or to ensure product quality. 相似文献
8.
V. V. Islamova N. A. Kucher V. I. Poltavtsev 《Russian Journal of Applied Chemistry》2009,82(8):1408-1412
We obtained an analytical solution of a problem of unsteady mass transfer under the equilibrium condition y = Ax + B to compare results with a problem solution in the case of equilibrium condition looking as y = Ax. 相似文献
9.
A biocompatible surfactant-n-dodecylammonium α-glutamate (GDA) with biodegradable and biocompatible properties was synthesized, and the phase behavior
and the structural properties of GDA/n-pentanol/water system was studied by small-angle X-ray diffraction, electron spin resonance, and freeze-fracture transmission
electron microscopy (FF-TEM). In the ternary phase diagram of GDA/n-pentanol/water system, there exist three isotropic regions—O/W, bicontinuous, and W/O structures, and two anisotropic regions—hexagonal
liquid crystal (HEX), and lamellar liquid crystal (LLC) regions. UV irradiation causes the decrease in the interlayer space,
d, of lamellar liquid crystal and in the radius, r, of column aggregates of hexagonal liquid crystal, but it has little effect on the structure of O/W and W/O microemulsions. 相似文献
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11.
Six new title compounds in the form of Cd(cyclobutylamine)2M′(CN)4 · 2G (M′ = Cd or Hg; G = benzene, 1,2-dichlorobenzene, or 1,3-dichlorobenzene) have been prepared in powder form. Their spectral
data were found to be consistent with the structure of the Hofmann-T
d
-type clathrates. 相似文献
12.
Ahmad Shaabani Ebrahim Soleimani Maria Darvishi 《Monatshefte für Chemie / Chemical Monthly》2007,138(1):43-46
Summary. The three-component condensation of aldehyde, N,N′-dimethylbarbituric acid and alkyl or aryl isocyanide afforded the corresponding furo[2,3-d]pyrimidine-2,4(1H,3H)-diones in 1-butyl-3-methylimidazolium bromide as an ionic liquid in high yields at room temperature within several minutes. 相似文献
13.
T. V. Koksharova A. S. Yaroslavskaya V. E. Polishchuk 《Russian Journal of Coordination Chemistry》2005,31(5):335-340
Biurate complexes with 4-phenylthiosemicarbazide, namely, [Mn(HL)2](Urat)2, [Co(HL)3](Urat)3, and [Ni(HL)4](Urat)2 (HL is 4-phenylthiosemicarbazide, Urat is anion of uric acid dissociating at first stage) are synthesized and their physicochemical properties and structures are studied by spectroscopic (IR and diffuse reflection) and DTA methods.__________Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 5, 2005, pp. 358–363.Original Russian Text Copyright © 2005 by Koksharova, Yaroslavskaya, Polishchuk. 相似文献
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16.
I. V. Kulakov 《Chemistry of Natural Compounds》2009,45(4):522-524
Condensation of the monosaccharides D-glucose and D-galactose with synthesized halo-substituted p-phenylenediamines and 4-amino-2,6-dibromophenol was studied. It was found that glycosylation occurred only at the 4-amino
group that was sterically unhindered by the halogen atom. The position of the aglycon in the glycoside was established by
PMR spectroscopy. 相似文献
17.
A. V. Piskunov V. K. Cherkasov N. O. Druzhkov G. A. Abakumov V. N. Ikorskii 《Russian Chemical Bulletin》2005,54(7):1627-1631
ESR spectroscopy was used to study a series of mono- and binuclear o-semiquinone metal complexes, viz., derivatives of sterically hindered di-o-quinone 1,2-bis(2,5-di-tert-butylcyclohexadiene-1,5-dion-3,4-yl)ethane (1). Hindered rotation was found in the o-semiquinone moiety of the generated complexes. Magnetochemical measurements for polymeric bis(o-semiquinolate)copper(II) based on di-o-quinone 1 showed two antiferromagnetic channels of interaction between the paramagnetic centers.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1580–1584, July, 2005. 相似文献
18.
O. V. Kalyazina T. G. Murzabekova T. F. Lelyukh I. A. Gritskova 《Russian Chemical Bulletin》2007,56(3):535-539
Copolymers of the poly(N,N-dimethyl-N,N-diallylammonium chloride) macromonomer (1′) with acrylamide (2) with a high content of cationic groups (up to 50%) were synthesized. The relative activities r
1′ and r
2 were calculated. The relative activities calculated by the Kelen—Tudos (r
1′ = 0.057±0.009, r
2 = 1.57±0.12) and Feynman—Ross (r
1′ = 0.055±0.011, r
2 = 1.58±0.14) methods are in accordance. The intrinsic viscosity and the yield of copolymers were found to decrease with an
increase in the molar fraction of macromonomer 1′ in the monomer mixture.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 515–518, March, 2007. 相似文献
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