Diol-linked microporous networks of cubic siloxane cages

Yuko Wada, Kenta Iyoki, Ayae Sugawara-Narutaki, Tatsuya Okubo, Atsushi Shimojima*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


A new class of inorganic-organic hybrid porous materials has been synthesized by a reaction between octa(hydridosilsesquioxane) (H 8Si8O12), which has a double-four-ring (D4R) structure, and various diols, such as 1,3-propanediol (PD), 1,4-cyclohexanediol (CHD), and 1,3-adamantanediol (AD). Solid-state 29Si magic-angle-spinning NMR spectroscopic analysis confirmed that most of the corner Si-H groups reacted with diols to form Si-O-C bonds with retention of the D4R cage. Nitrogen adsorption-desorption studies showed that the products are microporous solids with high BET surface areas (up to ≈580 m2 g-1 for CHD- and AD-linked products). If n-alkanediols are used as linkers, the surface area becomes smaller as the number of carbon atoms is increased. The thermal and hydrolytic stability of the products strongly depend on the type of diol linkers. The highest stabilities are found for the AD-linked products, which are thermally stable up to around 400 °C and remain intact even after being soaked in water for 1 day. In contrast, the PD-linked product is easily hydrolyzed in water to give microporous silica. These results offer a new route toward a series of silica-based porous materials with unique structures and properties.

Original languageEnglish
Pages (from-to)1700-1705
Number of pages6
JournalChemistry - A European Journal
Issue number5
Publication statusPublished - 2013 Jan 28
Externally publishedYes


  • alkoxides
  • cage compounds
  • microporous materials
  • organic-inorganic hybrid composites
  • siloxanes

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry


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