- Light-controlled self-assembly of a dithienylethene bolaamphiphile in water
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The self-assembly of bolaamphiphiles comprised of a central photochromic dithienylethene (DTE) chromophore was investigated in aqueous media. Irradiation at 254 nm induced a conversion from the open to closed states of the DTE chromophores. Whereas, in water, irradiation produced a photostationary state of 20 : 80 (open/closed), in methanol the ratio improved to 10 : 90 (open/closed). The open → closed transition was accompanied by the formation of 1D nanofibers during incubation in darkness. This journal is
- Creemer, Cassidy,Kilic, Haydar,Lee, Kwang Soo,Parquette, Jon R.,Saracoglu, Nurullah
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supporting information
p. 8846 - 8849
(2020/07/21)
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- New organotin(IV) ascorbates: Synthesis, spectral characterization, biological and potentiometric studies
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New organotin(IV) ascorbates of the general formulae R3Sn(HAsc) (where R = Me, n-Pr, n-Bu and Ph) and R2Sn(Asc) (where R = n-Bu and Ph) have been synthesized by the reaction of RnSnCl4-n (where n = 2 or 3) with monosodium-L-ascorbate. The bonding and coordination behaviour in these complexes are discussed on the basis of UV-Vis, IR, Far-IR, 1H and 13C NMR, and 119Sn Moessbauer spectroscopic studies. L-Ascorbic acid acts as a monoanionic bidentate ligand in R3Sn(HAsc) coordinating through O(1) and O(3). The Moessbauer studies together with IR and NMR studies suggest that for these polymeric derivatives, the polyhedron is trigonal bipyramidal around tin with three organic groups in the equatorial positions. In R2Sn(Asc), L-ascorbic acid acts as dianionic tetradentate ligand and a polymeric structure with octahedral geometry around tin with trans organic groups has been tentatively proposed. The complexes have been assayed for their anti-inflammatory and cardiovascular activity. Ph2Sn(Asc) has been found to show the highest activity among the studied complexes. It is suggested on the basis of potentiometric studies of Me2Sn(IV) and Me3Sn(IV) systems with L-ascorbic acid that under physiological conditions (pH = 7.0) Me 2Sn(HAsc)(OH) (~60%), Me2Sn(OH)2 (~40%) and Me3Sn(HAsc) (~60%), Me3Sn(OH) (~40%), respectively, are existing, which may be responsible for their biological activities.
- Nath, Mala,Jairath, Ruchi,Eng, George,Song, Xueqing,Kumar, Ashok
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- Reaction of pentafluorophenylsulfenyl chloride with β-substituted trimethylstannylacetylene
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Unlike trimethylstannylacetylene, its β-substituted derivatives react with pentafluorophenylsulfenyl chloride with formation of acetylenic sulfides. The 19F NMR spectral parameters of pentafluorophenylthio-acetylenes show some correlations similar to those found for pentafluorophenyl-containing acetylenes.
- Bogoradovskii,Maksimov,Zubova
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p. 913 - 916
(2007/10/03)
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- Reactions of Carbon Suboxide with Hydrides
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The reactions of corbon suboxide with a number of binary and complex hybrides (M-H) have been examined.The nature and the strength of the M-H bond, together with the ability of M to coordinate to the C=C double bond of C3O2, are the determining factors of the reaction course.Electronic factors are likely to be important in the formation of mono- (ketenic) or di- (malonic) insertion derivatives.
- Pandolfo, Luciano,Paiaro, Gastone
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p. 531 - 534
(2007/10/02)
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- Organotin Biocides. XIII. C-Triorganostannylimidazoles, -benzoxazoles and -benzothiazoles
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The synthesis, spectroscopic characterisation, and reactivity of a series of triorganotin imidazoles, benzothiazoles and benzoxazoles R3Sn(Het) (R=Me, Bu, Ph) are described.The structure of 2-(triphenylstannyl)benzothiazole has been determined by crystallographic methods.Space group: Triclinic, P1; a 9.501(1), b 10.172(2), c 13.231(2) Angstroem, β 70.46(1), γ 69.71(1) deg, U 1082.8 Angstroem3, F(000)=484, μ(Mo-Kα) 11.74 cm-1, R=0.0719 for 2264 reflections with I>3?I.The geometry at the tin is tetrahedral.Bond angles at tin are used to discuss the reactivity and Moessbauer spectra of these species.
- Molloy, Kieran C.,Waterfield, Philip C.,Mahon, Mary F.
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- The Reaction of Calcium Atoms with Group 4B Catenates, Me3E-E'Me2R (E, E'=Si, Ge, Sn; R=Me, Cl)
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Calcium atoms are thought to be inserted into E-E' bonds of group 4B catenates, Me3E-E'Me2R (E, E'=Si, Ge, Sn; R=Me, Cl) to give the corresponding Me3E-Ca-E'Me2R compounds.
- Mochida, Kunio,Yamanishi, Takayuki
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p. 3429 - 3430
(2007/10/02)
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- MONO- AND DI-ADDITION PRODUCTS OF CARBON SUBOXIDE WITH ORGANO-TIN AMIDO COMPOUNDS
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Carbon suboxide reacts with R3Sn-NMe2 (molar ratios 1:1 and 1:2) giving compounds, whose main features are presented, resulting from mono- and bis-addition of R3Sn-NMe2 across the C=C of C3O2
- Pandolfo, Luciano,Bressan, Mario,Paiaro, Gastone
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p. 471 - 472
(2007/10/02)
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- Synthesis of (Me3Sn)4Sb2 by Air-Oxidation of (Me3Sn)3Sb
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Oxidation of (Me3Sn)3Sb in air gives (Me3Sn)2O and ((Me3Sn)4Sb2 in 45percent yield. - Key words: Tetrakis(trimethylstannyl)distibane; Tris(trimethylstannyl)stibane; Bis(trimethylstannyl)oxide; Trimethylstannylhydroxide
- Breunig, Hans Joachim
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- ISOTOPE EFFECTS IN THE BASE CLEAVAGE OF (DIHALOMETHYL)TRIMETHYLTINS. ADDITIONAL EVIDENCE FOR PROPOSED MECHANISTIC PATHWAYS
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Solvent deuterium isotope effects on the reaction rate (RIE) and on the isotopic composition of the product (PIE) were studied for the three component reactions of the base cleavage of (dihalogenomethyl) trimethyltins (Me3SnCHX2; X=Cl, Br) in 8/2 v/v n-pr
- Stanczyk, W.,Chojnowski, J.
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p. 257 - 262
(2007/10/02)
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- Reactions of group IV organometallic compounds XXV. Preparations and reactions of tetramethylene-[(α-trimethylsilyl- or α-trimethylstannyl)phenacyl]sulphonium salts and ylides
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Tetramethylene[(α-trimethylsilyl- and α-trimethylstannyl)phenacyl]sulphonium salts [(CH2)4S+CH(MMe3)COPh]Cl- (M = Si and Sn) have been prepared by the reaction of tetramethylenesulphonium phenacyclide (I) with the relevant Me3MCl. The thermal rearrangement of tetramethylene[(α-trimethylsilyl)phenacyl]sulphonium chloride (II) unexpectedly afforded Cl(CH2)4SCHC(OSiMe3)Ph (III) by a 1,3-migration of the trimethylsilyl group to the oxygen atom accompanied by simultaneous ring-opening. Tetramethylene[(α-trimethylstannyl)phenacyl]sulphonium chloride (IV) gave the corresponding ylide (VI) by reaction with n-butyllithium.
- Itoh, Kenji,Kato,Ishii
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p. 293 - 298
(2007/10/10)
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