title: Porous titanium and zirconium oxo carboxylates at the interface between sol-gel and metal-organic framework structures.
abstract: Reaction of Ti(OiPr)4 with several tri- and tetracarboxylic acids, followed by hydrolysis, resulted in microporous, structured materials, with microporous surface areas up to 340 m(2) g(-1). Depending on the kind of carboxylic acid, the Ti : COOH ratio and the Ti : H2O ratio, either pillared layered or surface fractal 3D structures were obtained according to SAXS measurements. The most pronounced layered structure was found for 1,2,4,5-benzenetetrabenzoic acid and a Ti : H2O ratio of 4, while a Ti : H2O ratio of 2 resulted in a 3D structure. The use of 1,3,5-benzenetricarboxylic acid or 1,3,5-benzenetribenzoic acid resulted in similar structures which, however, were less pronounced and less ordered. The reaction of tetrakis(4-carboxyphenyl)silicon with Ti(OiPr)4 or benzenetribenzoic acid with Zr(OiPr)4 gave 3D structures for all Ti : H2O ratios.
authors.affiliation: Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Wien, Austria. Ulrich.Schubert@tuwien.ac.at.
authors.forename: Christian
authors.initials: C
authors.lastname: Maurer
authors.forename: Bettina
authors.initials: B
authors.lastname: Baumgartner
authors.forename: Silvia
authors.initials: S
authors.lastname: Pabisch
authors.forename: Johanna
authors.initials: J
authors.lastname: Akbarzadeh
authors.forename: Herwig
authors.initials: H
authors.lastname: Peterlik
authors.forename: Ulrich
authors.initials: U
authors.lastname: Schubert