- 2D Ferromagnetic sheet of antiferromagnetic trimeric metal cores
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A new 2D polymeric Mn-acetate complex [Mn3(CH 3COO)6·2H2O]n has been synthesized in a two step reaction process and characterized by single crystal X-ray crystallography, IR and thermal analyses. Structural analysis indicates that complex 1 crystallized in the P21/n space group and also shows that syn-syn and μ-oxo bridging of acetate ligands forms antiferromagnetic trimeric metal cores which are further connected by syn-anti and anti-anti bridging of acetates, leading to the formation of a 2D coordination sheet structure. These 2D coordination sheets are further connected by supramolecular hydrogen bonding interactions, leading to the formation of a 3D supramolecular structure. During the 3D supramolecular structure formation, the complex forms both right handed and left handed helical supramolecular chains. A variable temperature magnetic study indicates that complex 1 is antiferromagnetic above 105 K, while at lower temperatures (a clear hysteresis loop.
- Biswas, Susobhan,Saha, Rajat,Steele, Ian M.,Dey, Kamalendu,Kumar, Sanjay
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- Distinguishing between homogeneous and heterogeneous hydrogen-evolution catalysis with molecular cobalt complexes
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Molecular proton-reduction catalysts can decompose under the acidic conditions required for hydrogen evolution, resulting in formation of secondary metal-containing materials. Using an electrochemical quartz crystal microbalance (EQCM), we report a new method for probing electrodeposition of catalytically active heterogeneous material from molecular precursors. The data collected suggest that EQCM can provide a direct measure of the homogeneity of molecular proton-reduction catalysts over short timescales.
- Sconyers, David J.,Blakemore, James D.
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- Mild Isomerization of Conjugated Dienes Using Co-Mediated Hydrogen Atom Transfer
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A mild and high yielding rearrangement of 1,3-disubstituted-1,3-dienes to 1,1,4-trisubstituted-1,3-dienes using a cobaloxime catalyst and a silane cocatalyst is reported. Chiral centers near the conjugated diene were not racemized. Deuterium labeling studies are consistent with a hydrogen atom transfer mechanism, and radical intermediates were found to be accessible due to the observed ring opening of a cyclopropane ring.
- Delgado, Kyle R.,Youmans, Dustin D.,Diver, Steven T.
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supporting information
p. 750 - 754
(2020/01/31)
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- Photocatalytic Construction of S-S and C-S Bonds Promoted by Acridinium Salt: An Unexpected Pathway to Synthesize 1,2,4-Dithiazoles
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An unexpected cyclization of thioamides with p-quinone methides promoted by acridinium salt under the irradiation of visible light furnished 1,2,4-dithiazoles in moderate to good yields. In addition, the reaction of the obtained 1,2,4-dithiazoles with isocyanides offered a new entry for the synthesis of thiazol-5(4H)-imines in moderate yields.
- Huang, Xiao-Ying,Ding, Rui,Mo, Zu-Yu,Xu, Yan-Li,Tang, Hai-Tao,Wang, Heng-Shan,Chen, Yan-Yan,Pan, Ying-Ming
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supporting information
p. 4819 - 4823
(2018/08/24)
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- α-Diimine homologues of cisplatin: synthesis, speciation in DMSO/water and cytotoxicity
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The Pt(ii) α-diimine complexes [PtCl2{κ2N-(HCNR)2}] (R = C6H11, 1; 4-C6H10OH, 2; 4-C6H4CH3, 3; 4-C6H4OH, 4) and [PtCl2
- Biancalana, Lorenzo,Batchelor, Lucinda K.,Dyson, Paul J.,Zacchini, Stefano,Schoch, Silvia,Pampaloni, Guido,Marchetti, Fabio
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supporting information
p. 17453 - 17463
(2018/11/02)
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- Synthesis method of dimethylglyoxime
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The invention relates to a novel method for synthesizing dimethylglyoxime. The method comprises the following steps: 1) setting the thermostatic reaction temperature to 10-70 DEG C, and adding a catalyst into a solvent ethanol-butanedione mixed liquid, wherein the ethanol is 10-20 times by mass of the butanedione; and 2) adding stronger ammonia water and oxydol into the mixed liquid in the step 1) by 1-3 times within 0.5-1 hour, and reacting for 0.5-6 hours, wherein the mole ratio of the butanedione, oxydol and ammonia water is 1:(2-3.5):(2-4), and the catalyst is a titanium silicon molecular sieve and is 1-4 times by mass of the butanedione. Compared with the prior art, the reaction steps are reduced, thereby implementing one-step synthesis of dimethylglyoxime; the solid powder catalyst can be easily separated from the reaction system, and can be recycled, thereby enhancing the dimethylglyoxime production efficiency to some extent; and the used raw materials have low toxicity and no harm, and the reaction byproduct is water and is almost not hazardous to the environment, thereby satisfying the requirements of green chemical industry.
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Paragraph 0033; 0034; 0053; 0054; 0080
(2017/06/02)
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- Synthesis and structures of triphenylantimony oximates
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The reactions of triphenylantimony or trimethylantimony with tert-butyl hydroperoxide in the presence of acetone oxime, acetophenone oxime, cyclohexanone oxime, or benzaldehyde oxime afforded monomeric triorganoantimony oximates Ph3Sb(ON=CMesu
- Dodonov,Gushchin,Gor'Kaev,Fukin,Starostina,Zakharov,Kurskii,Shavyrin
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p. 1051 - 1057
(2007/10/03)
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- Uranyl Compounds with α-Dioximes: Mixed-Ligand Carbonatooxalate Complexes
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The interaction of uranyl complexes with α-dioximes having different structures in a carbonate-oxalate system was studied. It was shown that the pathway of the reaction and the compositions and the structures of the nascent complexes were significantly influenced by the α-dioxime structure. An X-ray diffraction study of (C2N2H10)2[(UO2) 2(CO3)(C2O4)2(C 3H4N2O2)] · H2O single crystals was carried out. The complex has a binuclear structure with bridging carbonate and methylglyoximate groups.
- Beirakhov,Orlova,Gorbunova,Mikhailov,Shchelokov
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p. 1414 - 1419
(2008/10/08)
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- Titanium (III) reduction of dimethylglyoxime: Electrochemical and kinetic studies
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Titanium (III) mediated electroreduction of dimethyl glyoxime has been carried out in aqueous sulphuric acid medium and the reduction product has been isolated and characterised. The kinetic investigations have been carried out under stoichiometric and non-stoichiometric conditions at 306K. It has been found that the reaction follows overall second order kinetics, first order each in [Ti(III)] and [DMG] and fractional order in sulphuric acid. The effect of varying concentrations of Ti(III), DMG, H2SO4, ionic strength, and solvent composition has been studied. Effect of temperature has also been studied and activation parameters have been computed from Arrhenius and Eyring plots.
- Yashoda,Padmalatha,Sherigara,Nayak
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p. 176 - 179
(2007/10/03)
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- Thermal Decomposition and Cobalt-Carbon Bond Dissociation Energies of Organocobalamins: Neopentyl-, (Cyclopentylmethyl)-, (Cyclohexylmethyl)-, (Tetrahydrofurfuryl)- and ((Tetrahydro-2H-pyryl)methyl)cobalamin
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The title compounds were prepared and characterized and their thermal decomposition reactions were studied in aqueous solutions of varying pH and containing varying concentrations of cob(II)alamin (B12) and of bis(dimethylglyoximato)cobalt(II), .
- Kim, Sook-Hui,Chen, Hui Lan,Feilchenfeld, Natalie,Halpern, Jack
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p. 3120 - 3126
(2007/10/02)
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- Application of the Bucherer Hydantoin Synthesis to Diacetyl Mono-oxime. The Mechanism of the Bucherer Reaction, and the Constitution of the Hypothetical 'Dimethylbishydantoin' of Bucherer and Lieb
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The major product obtained when the Bucherer conditions for hydantoin synthesis were applied to diacetyl mono-oxime was (3aRS,6aSR)-6-amino-1,3,3a,6a-tetrahydro-1-hydroxy-3a,6a-dimethylpyrroloimidazole-2,4-dione (3).Two minor products (7) and (9) are related to (3) but a third, the imidazole 1-oxide (10), is not.Compound (10) was obtained from diacetyl mono-oxime and ammonium carbonate in the absence of cyanide.It is proposed that 4,4-disubstituted 5-imino-oxazolidin-2-ones (18), postulated by Bucherer and Steiner to be intermediates in hydantoin syntheses, rearrange to hydantoins by a base catalysed E1cB mechanism.It is further proposed that (3) is the hypothetical 'dimethylbishydantoin' (35) reported by Bucherer and Lieb in 1934.
- Bowness, W. Gary,Howe, Ralph,Rao, Balbir S.
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p. 2649 - 2653
(2007/10/02)
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