Abstract
Porous titanium oxide materials are attractive for energy-related applications. However, many suffer from poor stability and crystallinity. Here we present a robust nanoporous metal–organic framework (MOF), comprising a Ti12O15 oxocluster and a tetracarboxylate ligand, achieved through a scalable synthesis. This material undergoes an unusual irreversible thermally induced phase transformation that generates a highly crystalline porous product with an infinite inorganic moiety of a very high condensation degree. Preliminary photophysical experiments indicate that the product after phase transformation exhibits photoconductive behavior, highlighting the impact of inorganic unit dimensionality on the alteration of physical properties. Introduction of a conductive polymer into its pores leads to a significant increase of the charge separation lifetime under irradiation. Additionally, the inorganic unit of this Ti-MOF can be easily modified via doping with other metal elements. The combined advantages of this compound make it a promising functional scaffold for practical applications.
Highlights
Porous titanium oxide materials are attractive for energy-related applications
We report a porous 3D mdip-based Ti-metal–organic framework (MOF), namely MIL-177-LT (MIL stands for Materials from Institut Lavoisier, LT for low temperature form and mdip for 3,3′,5,5′-tetracarboxydiphenylmethane), denoted MIP-177-LT (MIP stands for Materials from Institute of Porous Materials of Paris)
To the best of our knowledge, this serves as the first example in porous materials, MOFs or otherwise, that demonstrates the alteration of the dimensionality of the inorganic building unit as an efficient way of tuning the physical properties
Summary
Porous titanium oxide materials are attractive for energy-related applications. many suffer from poor stability and crystallinity. The focus is on the discovery of new Ti-MOFs that feature a highly ordered, crystalline, porous structure whose constituents are Ti–O-based inorganic units with a high condensation degree (>1) and long-term stability.
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