Syntheses of Twelve-Membered Ring Titana- and Zirconasiloxane Compounds and Their Properties as Ceramic Precursor
Autor: | Shin-Ichiro Kishiki, Yoshimoto Abe, Ken-Ichi Kubota, Takahiro Gunji |
---|---|
Rok vydání: | 2002 |
Předmět: | |
Zdroj: | Bulletin of the Chemical Society of Japan. 75:537-543 |
ISSN: | 1348-0634 0009-2673 |
Popis: | Cyclic metallasiloxanes, [(SiR1R2O)2M(acac)2O]2 (R1 = Me, R2 = OBut; R1 = R2 = OBut; R1 = OPri, R2 = OBut; M = Ti, Zr), were synthesized by the reaction of disiloxane-1,3-diols with diisopropoxidobis(2,4-pentanedionato)titanium(IV) or diisopropoxidobis(2,4-pentanedionato)zirconium(IV) in tetrahydrofuran. Cyclic titanasiloxanes and zirconasiloxanes have twelve-membered rings with the (Si–O–Si–O–Ti–O)2 linkages and (Si–O–Si–O–Zr–O)2 linkages, respectively. The pyrolysis of cyclic titanasiloxanes and zirconasiloxanes provided 2SiO2–TiO2 and 2SiO2–ZrO2 ceramics, respectively, which consist of amorphous silica and crystallized titania or zirconia. |
Databáze: | OpenAIRE |
Externí odkaz: |