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1.
Svetlana I. Dorovskikh Denis E. Tryakhov Darya D. Klyamer Alexander S. Sukhikh Irina V. Mirzaeva Natalia B. Morozova Tamara V. Basova 《Molecules (Basel, Switzerland)》2022,27(7)
To search for new suitable Pd precursors for MOCVD/ALD processes, the extended series of fluorinated palladium complexes [Pd(CH3CXCHCO(R))2] with β-diketone [tfa−1,1,1-trifluoro-2,4-pentanedionato (1); pfpa−5,5,6,6,6-pentafluoro-2,4-hexanedionato (3); hfba−5,5,6,6,7,7,7-heptafluoro-2,4-heptanedionato (5)] and β-iminoketone [i-tfa−1,1,1-trifluoro-2-imino-4-pentanonato (2); i-pfpa−5,5,6,6,6-pentafluoro-2-imino-4-hexanonato (4); i-hfba-5,5,6,6,7,7,7-heptafluoro-2-imino-4-heptanonato (6)] ligands were synthesized with 70–80% yields and characterized by a set of experimental (SXRD, XRD, IR, NMR spectroscopy, TG) and theoretical (DFT, Hirshfeld surface analysis) methods. Solutions of Pd β-diketonates contained both cis and trans isomers, while only trans isomers were detected in the solutions of Pd β-iminoketonates. The molecules 2–6 and new polymorphs of complexes 3 and 5 were arranged preferentially in stacks, and the distance between molecules in the stack generally increased with elongation of the fluorine chain in ligands. The H…F contacts were the main ones involved in the formation of packages of molecules 1–2, and C…F, F…F, NH…F contacts appeared in the structures of complexes 4–6. The stability of complexes and their polymorphs in the crystal phases were estimated from DFT calculations. The TG data showed that the volatility differences between Pd β-iminoketonates and Pd β-diketonates were minimized with the elongation of the fluorine chain in the ligands. 相似文献
2.
Optimum conditions for the formation and extraction of a slightly soluble ion associate of diphenhydramine with the anionic complex molibydenum–gallein were determined. The ternary complex was extracted with butanol at pH 4–7. In the presence of diphenhydramine, the color strength became stronger, which was manifested in the absorption spectra as hypsochromic and bathochromic shifts. Some physicochemical characteristics of the complex were determined, the specificity of the reaction with respect to diphenhydramine was studied, and the probable complexation scheme was proposed. It was found that the molybdenum–gallein–diphenhydramine complex forms at a component ratio of 1: 2: 2. A procedure for the extraction–photometric determination of diphenhydramine in injection solutions and tablets was developed (RSD = 15–20%). The linearity range of the calibration graph was 0.02–0.20 mg/mL. 相似文献
3.
M. G. Levkovich P. Kh. Yuldashev M. M. Mirzaeva B. Tashkhodzhaev 《Chemistry of Natural Compounds》2012,48(3):440-446
NMR spectra of norfluorocurarine and seven of its derivatives were studied. The NMR spectral parameters were related to stereochemical features using molecular modeling by the semi-empirical AM1 approximation. The resulting steric characteristics of the molecules in solution agreed well with x-ray structure data. The only difference from the x-ray structure data was the ability of several substituents to rotate. 相似文献
4.
Sh. M. Adizov B. Tashkhodzhaev R. Zh. Kunafiev M. M. Mirzaeva Pratik P. Upadhyay P. Kh. Yuldashev 《Journal of Structural Chemistry》2016,57(8):1619-1626
Indoline alkaloids kopsinilam and kopsinine extracted from the plant Vinca erecta have been studied by X-ray crystallography; mono and double salts of the latter alkaloid also have been examined. Experimentally determined positions of Н atoms suggest sp 3 hybridization of the indoline nitrogen atom N1 in the bases and the salts. Tetrahedral hybridization of the atom N1 in indoline alkaloids favors the formation of their double salts, what is unlikely for indole and indolinine alkaloids. In the halogen double salts there is an intramolecular Н bond between one of the protons of the NH2 group and the oxygen of the methoxycarbonyl group, that is absent in the mono salts and pure bases. 相似文献
5.
M. R. Mirzaeva R. K. Rakhmanberdyeva É. L. Kristallovich D. A. Rakhimov N. I. Shtonda 《Chemistry of Natural Compounds》1998,34(6):653-655
The water-soluble polysaccharides of the seeds of eight species of Gleditsia have been isolated and studied. They are galactomannans
with different viscosities, specific rotations, and ratios of galactose and mannose. A study of their chemical transformations
and IR spectral data has shown that the monosaccharide residues are pyranoses linked by β-1-4-glycosidic bonds having in the
second componentD-galactose with the α-configuration of the glycosidic center and the most probable chair conformation of the pyranose ring.
Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 727–730, November–December, 1998. 相似文献
6.
N. U. Mirzaeva T. V. Chernenko S. D. Gusakova Sh. Sh. Sagdullaev 《Chemistry of Natural Compounds》2011,47(3):355-357
Lipids from the air-dried aerial part (AP) and seeds of Silybum marianum (L.) Gaerth. (Asteraceae) were studied. The class and fatty acid compositions of neutral lipids (AP, seeds) and glyco- and
phospholipids (AP) were determined. Neutral lipids (NL) with a complicated set of lipophilic components, mainly triterpenols,
sterols, and their esters predominated in the AP. The fatty acids of the AP were dominated by 16:0, 18:2 (glycolipids), and
18:3 (neutral lipids, phospholipids); of seed NL, by 18:2 and 18:1. The content and composition of flavolignans isolated from
defatted seeds and the content of total protein in the meal were found. 相似文献
7.
M. R. Mirzaeva R. K. Rakhmanberdyeva D. A. Rakhimov 《Chemistry of Natural Compounds》1999,35(5):505-507
The structure of galactomannan from seeds ofGleditsia macracantha is studied by methylation, periodate oxidation, and partial acid hydrolysis. The principal polyglycoside chain consists of
β-1→4-bonded mannopyranose units, where the mannose is substituted in the 6-position by single α-D-galactopyranose units.
Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 573–576, September–October, 1999. 相似文献
8.
Yu. R. Mirzaeva R. Shakirov U. T. Shakirova A. Nabiev 《Chemistry of Natural Compounds》1993,29(4):516-518
Four new imperialine esters, with butyric, isovaleric, pyromucic, and benzoic acids, have been synthesized, and their M2-choline-blocking activity has been studied.
Deceased 相似文献
9.
B. Tashkhodzhaev K. K. Turgunov P. Kh. Yuldashev M. M. Mirzaeva 《Chemistry of Natural Compounds》2011,47(4):531-535
Structures of the alkaloids (−)-norfluorocurarine, its racemate (±)-norfluorocurarine from Vinca erecta, and fluorocurarine obtained by N(β)-methylation of (−)-norfluorocurarine were established by x-ray crystal structure analyses. The alkaloid crystallized with
two molecules in the asymmetric unit for the first two crystals. The asymmetric unit of (±)-norfluorocurarine crystal consisted
of two antipods. The asymmetric unit in the crystal of the last compound consisted of the N(β)-methylated cation and a hydroxide anion. The formation of bimolecular associates through intermolecular N–H…O H-bonds was
typical of these crystal- line structures. An associate in the crystal structure of fluorocurarine involved two hydroxide
anions. 相似文献
10.
P. A. Abramov M. N. Sokolov I. V. Mirzaeva N. K. Moroz 《Russian Journal of Coordination Chemistry》2013,39(5):379-387
Reactions of [CpRhCl2]2 (Cp = η5-C5Me5 (Cp*), η5-C5Me4Et (Cp′), η5-C5H3 t Bu2(Cp″)) with in situ generated H2Se give triangular [Cp3Rh3Se2]2+ clusters. These clusters were isolated as PF6 salts and characterized with ESI-MS, 77Se, 1H NMR and DFT calculations. [Cp3Rh3Se2] undergoes two reversible two-electron reduction steps. Quantum-chemical calculations reveal non-trivial bonding situation in the cluster core and changes in the hapticity of the Cp* ligand upon reduction. Crystal structure of [Cp 3 * Rh3Se2][Re2(μ-Cl)3(CO)6]Cl · 3.3H2O has been determined. 相似文献