An octameric titanium oxo metallacycle with host–guest interactions

Abstract

Treatment of Ti c14 with carboxylic acids RC02H (R = C6F5, CH2CcF5, CH20C6F5) yields a series of titanium 0x0 compounds; the X-ray molecular structure of [TiO(02CC6F5)21 reveals an octameric unit and a unique 16-mem bered T i 8 0 8 ring, with two toluene molecules encapsulated above and below the ring in the molecular cavity.

Ti8O8(OOCR)16, a New Family of Titanium–Oxo Clusters: Potential NBUs for Reticular Chemistry

“…Two free toluene molecules were trapped inside the remaining space between the axial fluorophenyl rings. [52] The same octameric structure was also obtained from titanium alkoxides and three different carboxylic acids [tBuCO 2 H, tBuCH 2 -CO 2 H, or Et(CH 3 ) 2 CCO 2 H]. These oxo clusters, obtained in lower yield, have been described as weakly stable species.…”

Secondary building units, nets and bonding in the chemistry of metal–organic frameworks

“…123). [228][229][230][231][232][233] Two carboxylates bridge each metal octahedron to each of its two neighboring octahedra, forming a ring of octahedral metal atoms. The remaining two corners are occupied by bridging anionic ligands, typically oxide, hydroxide or halide anions.…”

A Flexible Photoactive Titanium Metal–Organic Framework Based on a [TiIV3(μ3‐O)(O)2(COO)6] Cluster

“…[6][7][8][9][10][11][12][13] However,for titanium, very few crystalline three-dimensional frameworks with guestaccessible porosity have been described. [19][20][21] Theprime hurdle in the synthesis of Ti MOFs is the high reactivity of the commonly used Ti precursors,w hich are susceptible to fast olation and oxolation and thus readily form ill-defined oxyhydroxides. [19][20][21] Theprime hurdle in the synthesis of Ti MOFs is the high reactivity of the commonly used Ti precursors,w hich are susceptible to fast olation and oxolation and thus readily form ill-defined oxyhydroxides.…”