Supramolecular Aggregates of Silanols and Solid-State Synthesis of Siloxanes

ABSTRACT

Cocrystallization of all-cis-tetraisopropylcyclotetrasiloxanetetraol and diisopropylsilanediol gave single crystals, which were proved to have a nano-size tube-like aggregate structure. Six molecules of the cyclic tetraol and four molecules of the diol form an asymmetric unit by means of hydrogen bonding. The structure and properties of the aggregates are discussed in detail, and also the possibility of solid-state synthesis of siloxanes is described.

Keywords:

• crystal structure
• hydrogen bonding
• nano-size tube
• silanol
• solid-state synthesis

Acknowledgments

This work was supported by Grants-in-aid (Nos. 09239103 and 09304058) from the Ministry of Education, Science, Sports, and Culture of Japan.