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International Journal of Polymer Science
Volume 2012, Article ID 723892, 4 pages
Research Article

Nonacyclic Ladder Silsesquioxanes and Spectral Features of Ladder Polysilsesquioxanes

Department of Chemistry and Chemical Biology and International Education and Research Center for Silicon Science, Graduate School of Engineering, Gunma University, Kiryu 376-8515, Japan

Received 29 June 2012; Accepted 24 August 2012

Academic Editor: Kimihiro Matsukawa

Copyright © 2012 Masafumi Unno et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Laddersiloxanes, that is, ladder silsesquioxanes with defined structures, could be obtained by stepwise synthesis starting from cyclic silanols. These compounds were shown to have high thermal stability. As an extension of the previous work, the first nonacyclic ladder silsesquioxanes were synthesized by the reaction of bicyclic silanol with tricyclic tetrachloride, which were obtained from cyclic silanols. The structure was confirmed by spectral measurements, and the spectral features of a series of ladder polysilsesquioxanes with determined structures were analyzed.