The synthesis of crystalline, open titanium frameworks remains still very challenging due to the high reactivity of the reagents used and the difficulties in controlling the formation of persistent Ti(IV) secondary building units with predetermined directionality, amenable to the isoreticular approach. Common precursors are prone to hydrolysis in the solvothermal conditions used in the synthesis of Metal-Organic Frameworks (MOFs) leading to uncontrolled precipitation of amorphous oxides or hydroxides. As result, only a few porous Ti(IV)-MOFs have been reported thus far<sup> [1]</sup>. Compared to other highly charged metals like Zr(IV), more generally used for the synthesis of chemically stable MOFs, titanium is naturally more abundant and offers advantageous features like low toxicity, redox versatility and photoactivity. We will describe our recent results in the synthesis of new titanium organic frameworks by using high throughput methodologies.<sup> [2,3,4]</sup> Our approach permits producing porous crystals of homo and heterometallic Ti-MOFs at high scale from multiple precursors. We will also discuss the interest of these families of micro and mesoporous materials in the context of photocatalysis and water sorption and how their function can be manipulated by metal doping or defect engineering for more precise control over their electronic properties, photoactivity and porosity.

De novo synthesis of homo and heterometallic titanium organic frameworks with high-throughput methodologies

2019 Fall National Meeting

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