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Alexsandr I. Yanovsky

Bio: Alexsandr I. Yanovsky is an academic researcher from A. N. Nesmeyanov Institute of Organoelement Compounds. The author has contributed to research in topics: Alkoxide & Trigonal bipyramidal molecular geometry. The author has an hindex of 3, co-authored 4 publications receiving 49 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a review of the main events in the development of metal alkoxides in Russian and summarizes the results obtained by the authors has been provided, including the analysis of solubility and vapor pressure in the M(OR)n-ROH (R  Li, Mg, Ca, Sr, Ba, Tl) systems permitted the determination of the composition of the solvates formed and the optimization of the isolation conditions for distinct derivatives.

39 citations

Journal ArticleDOI
TL;DR: The solvate LiOMe·2MeOH (1) was isolated from a solution of LiOme in MeOH, its tetrameric unit [Li4(μ-OR)4 (μ-ROH)2(ROH4]·2ROH may be described as two distorted squares [Li2(μ -OR)(μ -ROH), linked by bridging alkoxy groups and two hydrogen bonds as mentioned in this paper.
Abstract: The solvate LiOMe·2MeOH (1) was isolated from a solution of LiOMe in MeOH, its tetrameric unit [Li4(μ-OR)4(μ-ROH)2(ROH)4]·2ROH may be described as two distorted squares [Li2(μ-OR)(μ-ROH)], linked by bridging alkoxy groups and two hydrogen bonds; 1 easily loses the solvate alcohol yielding polymeric LiOMe.

7 citations

Journal ArticleDOI
TL;DR: In this article, the amorphous bimetallic isopropoxides of variable composition LaZr n O x (OPr i ) 3+4 n −2 x, where n ǫ = 0.5 −3 formed on interaction of the two homometallic isopsides, La 5 O(O i Pr) 13 and Zr(O I Pr) 4 ( i PrOH), in solutions in parent alcohol crystallize slowly yielding a bimetal oxoalkoxide La 2 Zr 3 O(OPr I ) 16 ( 1 ).

4 citations

Journal ArticleDOI
TL;DR: The structure of I as determined by the X-ray diffraction (XRD) method features infinite chains made up of two alternating tetranuclear species [Li2WO]2(OMe)10] (A) and [Li 2WO)2OMe10(MeOH)2] (B), linked via LiOW bridges involving the Li atom belonging to fragment A and tungstenyl group from fragment B as discussed by the authors.

1 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a review of the synthesis and polymerization of aliphatic cyclic carbonates of different size and type is presented. And the mechanisms of cationic, anionic, coordination and enzymatic polymerization are discussed for obtaining polymers with well-defined structures and oligomers with reactive pendant and end groups.

465 citations

Journal ArticleDOI
TL;DR: Organometallic Aggregates.
Abstract: Organometallic Aggregates. 1. Structural Data Anne Harrison-Marchand*,† and Florence Mongin*,‡ †Laboratoire COBRA de l′Universite ́ de Rouen, INSA de Rouen, CNRS, UMR 6014 & FR 3038, IRCOF, Rue Tesnier̀e, 76821 Mont St Aignan Ced́ex, France ‡Équipe Chimie et Photonique Molećulaires, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Universite ́ de Rennes 1, Bat̂iment 10A, case 1003, Avenue du Geńeŕal Leclerc, 35042 Rennes Ced́ex, France

158 citations

Journal ArticleDOI
TL;DR: In this paper, a synthetic route to mononuclear silica-supported Ti alkoxide complexes was developed by reaction of grafted amide complexes (⋮SiO)nTi(NEt2)4-n (n = 1 or 2) with alcohols.
Abstract: The room-temperature reactions of excess Ti(OiPr)4 with the hydroxyl groups of a nonporous silica yield dinuclear surface complexes regardless of the degree of partial dehydroxylation of the silica. The surface reactions were studied by in situ IR transmission spectroscopy, 13C CP/MAS NMR, GC/MS, and elemental analysis. The spontaneous stoichiometric formation of both 2-propanol and propene during grafting indicates that interaction of Ti(OiPr)4 with the silica surface induces disproportionation of alkoxide ligands with concomitant formation of Ti−O−Ti bridges. A synthetic route to mononuclear silica-supported Ti alkoxide complexes was developed by reaction of grafted amide complexes (⋮SiO)nTi(NEt2)4-n (n = 1 or 2) with alcohols. Subsequent reactions of the mononuclear surface alkoxide complexes with Ti(OiPr)4 yield dinuclear species identical to those prepared by the direct reaction of Ti(OiPr)4 with silica. Both mono- and dinuclear supported alkoxide complexes undergo ligand-exchange reactions with tert...

121 citations

Journal ArticleDOI
TL;DR: In this paper, a review based on 169 references gives an actual overview on group 1 and 2 clusters with oxygen donor ligands, starting with Mg-compounds, then pursuing with the heavier homologues.

66 citations

Journal ArticleDOI
13 May 2016-Langmuir
TL;DR: High resolution transmission electron microscopy analyses of reactant and product phases show that the alkoxides replace the crystalline structure of Ca(OH)2 along specific [hkl] directions, preserving the external hexagonal (platelike) morphology of the parent phase.
Abstract: Nanolimes are alcohol dispersions of Ca(OH)2 nanoparticles used in the conservation of cultural heritage. Although it was believed that Ca(OH)2 particles were inert when dispersed in short-chain alcohols, it has been recently shown that they can undergo transformation into calcium alkoxides. Little is known, however, about the mechanism and kinetics of such a phase transformation as well as its effect on the performance of nanolimes. Here we show that Ca(OH)2 particles formed after lime slaking react with ethanol and isopropanol and partially transform (fractional conversion, α up to 0.08) into calcium ethoxide and isopropoxide, respectively. The transformation shows Arrhenius behavior, with apparent activation energy Ea of 29 ± 4 and 37 ± 6 kJ mol–1 for Ca-ethoxide and Ca-isopropoxide conversion, respectively. High resolution transmission electron microscopy analyses of reactant and product phases show that the alkoxides replace the crystalline structure of Ca(OH)2 along specific [hkl] directions, preser...

60 citations