title: Janus-Cube Octasilsesquioxane: Facile Synthesis and Structure Elucidation.
abstract: A perfect "Janus-cube" octasilsesquioxane, a nanometer-scale Janus particle with two different types of substituents, was synthesized through the cross-coupling of a "half-cube" cyclic sodium siloxanolate with another half-cube cyclic fluorosiloxane. The structure was confirmed by X-ray crystallography to be a Janus cube. The overall synthesis is simple and does not require drastic separation methods compared with previous methods. The synthesis of the Janus cube demonstrates a novel siloxane bond-forming reaction involving the coupling a silanol salt and fluorosilane. The reaction is mild, does not result in acid generation, and could be applied to the construction of other novel siloxane compounds.
authors.affiliation: Department of Chemistry and Chemical Biology, Graduate School of Science and Technology, Gunma University, Kiryu, 376-8515, Gunma, Japan.
authors.forename: Naoki
authors.identifier: 0000-0001-7433-6808
authors.initials: N
authors.lastname: Oguri
authors.affiliation: Department of Chemistry and Chemical Biology, Graduate School of Science and Technology, Gunma University, Kiryu, 376-8515, Gunma, Japan.
authors.forename: Yasunobu
authors.identifier: 0000-0002-9542-0141
authors.initials: Y
authors.lastname: Egawa
authors.affiliation: Department of Chemistry and Chemical Biology, Graduate School of Science and Technology, Gunma University, Kiryu, 376-8515, Gunma, Japan.
authors.forename: Nobuhiro
authors.identifier: 0000-0001-5732-758X
authors.initials: N
authors.lastname: Takeda
authors.affiliation: Department of Chemistry and Chemical Biology, Graduate School of Science and Technology, Gunma University, Kiryu, 376-8515, Gunma, Japan. unno@gunma-u.ac.jp.
authors.forename: Masafumi
authors.identifier: 0000-0003-2158-1644
authors.initials: M
authors.lastname: Unno
keywords: Janus particles; materials science; siloxane bond formation; siloxanes; silsesquioxanes