- Heats of Solution and Viscosity B Coefficients for Some Cyclic Mono- and Bis(quaternary ammonium) Salts
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Heats of solution and viscosity B coefficients, for cyclic mono(quaternary ammonium) salts, (CH3)2N(CH2)nBr (n=4-6) and cyclic bis(quaternary ammonium) salts, (CH3)2N((CH2)2)(CH2)nN(CH3)2Br2 (n=1-3) in water were measured, and the effect of structural changes in the solvent water upon the dissolution of both series of electrolytes is discussed.
- Tamaki, Kunio,Kitazawa, Takeshi,Asada, Misako
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- Flavin Derivatives with Tailored Redox Properties: Synthesis, Characterization, and Electrochemical Behavior
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This study establishes structure–property relationships for four synthetic flavin molecules as bioinspired redox mediators in electro- and photocatalysis applications. The studied flavin compounds were disubstituted with polar substituents at the N1 and N
- Kormányos, Attila,Hossain, Mohammad S.,Ghadimkhani, Ghazaleh,Johnson, Joe J.,Janáky, Csaba,de Tacconi, Norma R.,Foss, Frank W.,Paz, Yaron,Rajeshwar, Krishnan
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- Preparation, reactions, and spectroscopic investigation of the 1,1,3,3-tetramethylimidazolidinium and 1,1,4,4-tetramethylpiperazonium dications
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The title dictations are prepared in a single step by the reaction of N,N,N',N'-tetramethyl-1,2-diaminoethane (tmen) with the halogenoalkanes CH2X2 (X = Cl, Br, or I) or CH2XCH2X (X = Cl or Br), respectively.These bulky dications are useful for the precipitation of complex ions from solution, and show selectivity for doubly-charged anions.Tmen also reacts with CBr4 to yield a dibromo-imidazolidinium heterocyclic dication, whereas reaction with CHBr2CHBr2 produces the dihydrobromide of tmen.Vibration and nmr spectra are reported, and the protons of the CH2 group between the two quaternary nitrogen atoms of the tetramethylimidazolidinium dication are shown from the nmr data to possess acidic character.
- Creighton, J. Alain,Taylor, Michael J.
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p. 2526 - 2528
(2007/10/02)
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