6286-82-4Relevant articles and documents
A new polar perovskite coordination network with azaspiroundecane as A-site cation
Bostr?m, Hanna L. B.,Burger, Stefan,Kieslich, Gregor,Kronawitter, Silva,Zar?ba, Jan K.
, p. 10740 - 10744 (2020)
ABX3 perovskite coordination networks are a rapidly growing sub-class of crystalline coordination networks. At present, synthetic efforts in the field are dominated by the use of commercially available building blocks, leaving the potential for tuning properties via targeted compositional changes largely untouched. Here we apply a rational crystal engineering approach, using 6-azaspiro[5.5]undecane ([ASU]+) as A-site cation for the synthesis of the polar perovskite [ASU][Cd(C2N3)3]. This journal is
METHOD OF PROCESSING CELLULOSIC MATERIALS
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Page/Page column 15, (2019/10/15)
The present invention relates to a method of processing cellulosic materials, particularly to a method of dissolving cellulose from cellulose containing feedstock, such as pulp, by contacting the cellulose containing feedstock with thermally and chemically stable ammonium salts, such as spirocyclic ammonium salts or quaternised cyclic ammonium salts. The invention also relates to the use of said ammonium salts for cellulose processing and to a method of manufacturing cellulose- based shaped articles.
Alkaline stability of quaternary ammonium cations for alkaline fuel cell membranes and ionic liquids
Marino,Kreuer
, p. 513 - 523 (2015/03/04)
The alkaline stability of 26 different quaternary ammonium groups (QA) is investigated for temperatures up to 160°C and NaOH concentrations up to 10 molL-1 with the aim to provide a basis for the selection of functional groups for hydroxide exchange membranes in alkaline fuel cells and of ionic-liquid cations stable in basic conditions. Most QAs exhibit unexpectedly high alkaline stability with the exception of aromatic cations. b-Protons are found to be far less susceptible to nucleophilic attack than previously suggested, whereas the presence of benzyl groups, nearby hetero-atoms, or other electron-withdrawing species promote degradation reactions significantly. Cyclic QAs proved to be exceptionally stable, with the piperidine-based 6-azonia-spiro[5.5]undecane featuring the highest half-life at the chosen conditions. Absolute and relative stabilities presented herein stand in contrast to literature data, the differences being ascribed to solvent effects on degradation.