Dendritic, nanosized building block for Siloxane-based materials: A spherosilicate dendrimer

Kazufumi Kawahara, Yoshiaki Hagiwara, Kazuyuki Kuroda

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A spherosilicate dendrimer (DMS-1) with closely spaced reaction sites (Si-H groups) on the dendrimer surface has been synthesized by stepwise silylation of double-four-ring silicate with chlorotriethoxysilane (ClSi(OEt)3) and subsequently with chlorodimethylsilane (ClSiHMe2). DMS-1 consists of a maximum of 40 Si atoms in the interior frameworks and 24 reactive Si-H groups on the surface. Because DMS-1 is spherical and about 1.5 nm in diameter, it can be regarded as the smallest well-defined silica-based nanoparticle. DMS-1 also forms molecular crystals and is soluble in typical organic solvents. A molecularly ordered silica-based hybrid can be prepared by heating a cast film of DMS-1 at 180 °C for 5 days. The surface of DMS-1 can be modified by hydrosilylation with 1-hexadecene, triethoxyvinylsilane, and allylic-terminated tetraethylene glycol monomethyl ether. More than 20 Si-H groups out of 24 react with these reagents. The solubilities of the products depend on the modification. DMS-1 is not only a building block for nanohybrids, but also the smallest and most precisely designed siloxane-based nanoparticle.

Original languageEnglish
Pages (from-to)13188-13196
Number of pages9
JournalChemistry - A European Journal
Volume17
Issue number47
DOIs
Publication statusPublished - 2011 Nov 18

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Keywords

  • dendrimers
  • nanoparticles
  • organic-inorganic hybrid composites
  • silanes
  • silicates

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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