Zeitschrift für Kristallographie - Crystalline Materials
Editor-in-Chief: Pöttgen, Rainer
Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Huppertz, Hubert / Petrícek, Václav / Tiekink, E. R. T.
12 Issues per year
IMPACT FACTOR increased in 2015: 2.560
Rank 8 out of 26 in category Cristallography in the 2015 Thomson Reuters Journal Citation Report/Science Edition
SCImago Journal Rank (SJR) 2015: 0.827
Source Normalized Impact per Paper (SNIP) 2015: 1.198
Impact per Publication (IPP) 2015: 1.834
Rodlike polysilsesquioxanes forming regular higher-ordered nanostructure such as hexagonal phase were prepared by sol-gel reaction of organotrimethoxysilanes having amino groups in aqueous solutions of inorganic strong acids. The XRD profiles of the resulting polysilsesquioxanes showed three peaks with the d-value ratio of 1 : 1/√3 : ½, indicating that these polysilsesquioxanes have hexagonal phase. The diffraction peaks shifted by changing the humidity. In addition, the d-values of diffraction peaks increased by ion-exchange reaction with organic compounds such as fatty acid salt and anionic polymer. Therefore, this hexagonal phase originated from the stacking of rodlike polysilsesquioxanes with Si–O–Si framework at the core and ammonium groups extruding outside. This Si–O–Si framework probably formed a ladder or ladder-related structure, which was characterized by solid-state 29Si NMR and IR spectrometries.
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