Structures and photophysical performances of (fluoro)salicylate stabilized polyoxo-titanium clusters

Abstract

We herein report the synthesis and structures of two salicylate-stabilized polyoxo-titanium clusters (PTCs) with and without fluorine, namely, H₂[Ti₁₃(μ₃-O)₇(μ₂-O)₄(Sal-F)₉(OⁱPr)₁₄] (PTC-95, H₂Sal-F = 5-fluorosalicylic acid) and H₂[Ti₁₄(μ₃-O)₈(μ₂-O)₄(Sal)₈(OⁱPr)₁₈]·HOⁱPr (PTC-96, H₂Sal = salicylic acid). Structural analyses indicated that PTC-95 is a fairly compact structure made up of a quadrangular prism with an appended linear Ti₃ cluster and two additional Ti atoms. PTC-96 possesses an arch bridge-shaped structure linked by two Ti₄(μ₃-O)₂ and two Ti₃(μ₃-O) clusters. Apart from the intrinsic structural features, their diverse photocurrent response properties and photocatalytic activities towards dye degradation were also demonstrated.