| 1. |
- Fischer, A I, et al.
(författare)
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Crystal and molecular structures of mixedvalence octanuclear cobalt(II,III) propionate and butyrate with an etagerelike core
- 2012
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Ingår i: Russian chemical bulletin. - : Springer Science+Business Media B.V.. - 1066-5285 .- 1573-9171. ; 61:4, s. 821-827
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Tidskriftsartikel (refereegranskat)abstract
- The new mixed-valence octanuclear cobalt carboxylate complexes [CoII4CoIII4(μ4-O)4-(μ3-OMe)4(μ-O2CR)6(O2CR)2(H2O)6]·4H2O, where R = Et (3) or n-Pr (4), were investigated by X-ray diffraction analysis. Complexes 3 and 4 have a molecular octanuclear structure, and they are valence trapped, and contain four cobalt atoms Co3+ in the central cubane fragment with four cobalt atoms Co2+ at the periphery of the molecules. The molecules of the complexes are stabilized by four intramolecular hydrogen bonds and are linked, together with water solvent molecules, by intermolecular hydrogen bonds to form a three-dimensional supramolecular system.
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| 2. |
- Gromov, S P, et al.
(författare)
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Self-assembly of a (benzothiazolyl)ethenylbenzocrown ether into a sandwich complex and stereoselective [2+2] photocycloaddition
- 2005
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Ingår i: RUSSIAN CHEMICAL BULLETIN. - : Springer Science and Business Media LLC. - 1066-5285 .- 1573-9171. ; 54:7, s. 1569-79
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Tidskriftsartikel (refereegranskat)abstract
- In the presence of Ba2+ ions, (benzothiazolyl)ethenylbenzocrown ether forms the stable sandwich complex 2L center dot Ba2+ with an unusual structure, in which the benzothiazole fragments are arranged one above the other. Irradiation of the sandwich complex with visible light induces stereoselective [2+2] cycloaddition giving rise to two "head-to-head" isomers of biscrown-cyclobutane. The addition of dibasic dicarboxylic acids that additionally stabilize the sandwich complex in a favorable conformation affects the isomer ratio of the cyclobutanes formed. The conformational equilibria for the sandwich complex and cyclobutanes were studied by H-1 N MR spectroscopy.
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| 3. |
- Korneeva, E.V., et al.
(författare)
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Binding of gold(iii) with silver(i) dipropyldithiocarbamate : supramolecular self-assembly (role of secondary Au…S and Ag…S bonds) and thermal behavior of the ionic-polymer complex ([Au(S2CNPr2)2][AgCl2])n
- 2019
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Ingår i: Russian chemical bulletin. - : Springer. - 1066-5285 .- 1573-9171. ; 68:1, s. 40-47
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Tidskriftsartikel (refereegranskat)abstract
- The double ionic-polymer complex ([Au(S2CNPr2)2][AgCl2])n (1) was prepared as an individual fixation form of gold(III) from NaCl solutions with silver(I) dipropyldithiocarbamate and was characterized by single-crystal X-ray diffraction and 13C magic-angle spinning (MAS) NMR spectroscopy. The structure of 1 comprises two nonequivalent centrosymmetric complex cations [Au(S2CNPr2)2]+ (A and B) and the discrete linear anion [AgCl2]–. Gold(III) cations are linked by pairs of unsymmetrical secondary Au…S bonds to form linear supramolecular chains (…A…B…)n. Neighboring cations are additionally linked by [AgCl2]– anions via secondary Ag…S and Cl…S bonds, the anions being involved in the overall stabilization of the supramolecular structure. The cation–anion interactions lead to a distortion of the linear configuration of the [AgCl2]– anion. The character of thermolysis of 1 accompanied by quantitative regeneration of bound Au and Ag was established by simultaneous thermal analysis.
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| 4. |
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| 5. |
- Loseva, O.V., et al.
(författare)
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Tetranuclear heteroleptic mercury(ii) complexes of the composition [Hg4(S2CNPr2)6(NO3)2] and [Hg4(S2CNPr2)4Cl4] : structural organization, principles of construction of supramolecular polymeric chains, and thermal behavior
- 2019
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Ingår i: Russian chemical bulletin. - : Springer. - 1066-5285 .- 1573-9171. ; 68:4, s. 782-792
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Tidskriftsartikel (refereegranskat)abstract
- New heteroleptic mercury(ii) complexes [Hg4(S2CNPr2)6(NO3)2] (1) and [Hg4(S2CNPr2)4Cl4] (2) were synthesized and characterized by single-crystal X-ray dif raction and 13C and 15N MAS NMR spectroscopy. In these complexes, the metal atoms are linked in pairs by bridging dipropyldithiocarbamate ligands (Pr2Dtc) to form tetranuclear cations and molecules. The further structural organization of compound 1 to the polymeric chains [Hg4(S2CNPr2)6(NO3)2]n occurs due to the linking of [Hg4(S2CNPr2)6]2+ cations by pairs of bridging nitrate groups. The formation of the supramolecular polymeric structure of 2 is determined by pairwise secondary Hg⋯Cl bonds between the cyclic [Hg4(S2CNPr2)4Cl4] molecules, in which the central eight-membered metallocycle [Hg4S4] adopts a distorted chair conformation. The thermal behavior of compounds 1 and 2 was studied by simultaneous thermal analysis.
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| 7. |
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| 8. |
- Yegorova, A. Yu, et al.
(författare)
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Effective synthesis of 5-aryl-3-ethylidene-3H-pyrrol-2-ones
- 2006
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Ingår i: Russian Chemical Bulletin. - : Springer Science and Business Media LLC. - 1573-9171 .- 1066-5285. ; 55:4, s. 718-721
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Tidskriftsartikel (refereegranskat)abstract
- Substituted 5-aryl-3-ethylidene-3H-pyrrol-2-ones were synthesized by the reaction of the corresponding 4-aryl-4-oxobutanoic acids with ketones in the presence of aminating agents. The conditions of this reaction were developed with the use of both the conventional condensation technique and microwave activation. The structures of the reaction products were con-firmed by elemental analysis, IR spectroscopy, and 1H NMR spectroscopy.
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| 9. |
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| 10. |
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