546-89-4Relevant articles and documents
The influence of temperature (20-1000 °C) on binary mixtures of solid solutions of CH3COOLi·2H2O-MgHPO4·3H2O
Umbreit, Micha? H.,Paukszta, Dominik
, p. 3620 - 3636 (2009)
Thermally induced phase transitions (20-1000 °C) in the substrates and binary mixtures of CH3COOLi·2H2O(1)-MgHPO4·3H2O(11) have been analysed. Changes taking place on dehydration and thermal dissociation of bina
Reactions in the rechargeable lithium-O2 battery with alkyl carbonate electrolytes
Freunberger, Stefan A.,Chen, Yuhui,Peng, Zhangquan,Griffin, John M.,Hardwick, Laurence J.,Barde, Fanny,Novak, Petr,Bruce, Peter G.
, p. 8040 - 8047 (2011)
The nonaqueous rechargeable lithium-O2 battery containing an alkyl carbonate electrolyte discharges by formation of C3H 6(OCO2Li)2, Li2CO3, HCO2Li, CH3CO2Li, CO2, and H 2O at the cathode, due to electrolyte decomposition. Charging involves oxidation of C3H6(OCO2Li)2, Li2CO3, HCO2Li, CH3CO2Li accompanied by CO2 and H2O evolution. Mechanisms are proposed for the reactions on discharge and charge. The different pathways for discharge and charge are consistent with the widely observed voltage gap in Li-O2 cells. Oxidation of C3H6(OCO 2Li)2 involves terminal carbonate groups leaving behind the OC3H6O moiety that reacts to form a thick gel on the Li anode. Li2CO3, HCO2Li, CH3CO 2Li, and C3H6(OCO2Li)2 accumulate in the cathode on cycling correlating with capacity fading and cell failure. The latter is compounded by continuous consumption of the electrolyte on each discharge.
Solvent effects on ester linkage of 4-nitrophenyl acetate in aqueous and ethanol solutions with imidazole and hydroxide ion as nucleophiles
Al-Terairy, Seham S.,Basaif, Salim,El-Awady, Abbas A.
experimental part, p. 1491 - 1496 (2009/05/15)
The reaction of 4-nitrophenyl acetate in aqueous and ethanol solutions with imidazole as a nucleophile has been monitored spectrophotometrically. The second order rate constants of these reactions are 10 times higher in water than in alcoholic solutions. This is attributed to better solvation of the initial state and less solvation of the excited state in the alcohol medium. The entropy of activation in water is more negative indicating the greater structuredness of the excited state in water. In addition to the above, the base hydrolysis reaction of the ester using OH- as a nucleophile in buffered aqueous solutions has been followed spectrophotometrically as a function of pH The observed pseudo first order rate constant obeys the relationship k obs=ko+kOH [OH-] where ko represents the water reactions and the buffer dependent rate constant, and kOH is the rate constant for the OH- catalyzed (specific base) reaction. For both cases, a mechanism involving a tetrahedral intermediate and in which the nucleophile attacks at the electrophillic carbon of the ester C=O is proposed.