A New Photoactive Crystalline Highly Porous Titanium(IV) Dicarboxylate

Fast and continuous processing of a new sub-micronic lanthanide-based metal–organic framework

One phase – two processes – two magnitudes for synthesis time and the particle size.

A coordination polymer with unusual structural features from imidazolylbutyric acid and titanium isopropoxide

Abstract

The coordination polymer [Ti(OiPr)₃(OOCCH₂CH₂CH₂C₃N₂H₃)]_n was prepared from 4-(imidazol-1-yl)butyric acid and titanium isopropoxide. The structure of the compound is remarkable, as the carboxylate group is coordinated in a chelating manner and no dimerization of the Ti(OiPr)₃ groups through OR bridges was observed.

Graphical abstract

Substitution reactions in metal–organic frameworks and metal–organic polyhedra

This review summarizes the advances in the study of substitution reactions in metal–organic frameworks (MOFs) and metal–organic polyhedra (MOPs).

The first depleted heterojunction TiO2–MOF-based solar cell

A single-step hydrothermal synthesis of a TiO₂–Mil-125 composite was applied for the first time to produce a depleted perovskite/TiO₂–MOF heterojunction solar cell with 6.4% power conversion efficiency.

Structure–property relationships of water adsorption in metal–organic frameworks

Among porous solids, MOFs exhibit a wealth of water adsorption behaviors.

Metal-organic frameworks (MOFs) as precursors towards TiOx/C composites for photodegradation of organic dye

TiO_x/C composites were prepared by pyrolyzing MIL-125 that exhibited excellent catalytic activities towards the photodegradation of methylene blue.

Delayed electron–hole pair recombination in iron(iii)-oxo metal–organic frameworks

The photodynamic properties of a series of Fe(iii)-MOFs have been examined via redox reactions with N,N,N′,N′-tetramethyl-p-phenylenediamine as an electron donor and methyl viologen as an electron acceptor. Furthermore, photogeneration of long-lived species in MIL-88B(Fe) has been proven via transient absorption spectroscopy.

High valence 3p and transition metal based MOFs

This article focuses on high valence 3p and transition metal based metal organic frameworks.

Enhanced water stability and CO2 gas sorption properties of a methyl functionalized titanium metal–organic framework

A methyl-modified metal–organic framework (m-TiBDC) exhibiting significantly enhanced hydrostability than unmodified TiBDC maintains its framework structure and also CO₂ gas adsorption capacity even after its immersion in water for 2 hours.

A p-type Ti(iv)-based metal–organic framework with visible-light photo-response

Photoelectrochemical studies on a new Ti(iv)-based porous metal–organic framework (NTU-9, bandgap 1.72 eV) indicated that NTU-9 is a p-type semiconductor with visible-light-driven photoactivity.

Toxic gas removal – metal–organic frameworks for the capture and degradation of toxic gases and vapours

The adsorptive and catalytic properties of metal–organic frameworks are advantageous for the capture, sensing and degradation of harmful gases and vapors.

Photocatalysis by MOFs

In this chapter it has been exemplified that MOFs can exhibit photoactivity derived from the interaction of the organic linker with the inorganic clusters. Comparison with analogous systems in solution shows that the crystal lattice of MOF, in which the linker and the organic cluster have intimate contact, originates a photochemical response that is not found for the homogeneous solution. Furthermore, MOFs can act as passive matrices to accommodate, in the internal voids, photoactive chromophores that can exhibit a distinctive response due to the properties of the surrounding media. All the discussed examples illustrate the possibility of obtaining interesting photoresponses that can open up applications beyond absorption and catalysis. Among these applications we have commented the use of MOFs as photocatalysts for environmental remediation and for the generation of solid fuels, particularly hydrogen, as well as applications in optoelectronics including solar cells and phosphors. All these applications derive from the consideration of MOFs as semiconductors.

An adsorbent performance indicator as a first step evaluation of novel sorbents for gas separations: application to metal-organic frameworks

An adsorbent performance indicator (API) is proposed in an effort to initially highlight porous materials of potential interest for PSA separation processes. This expression takes into account working capacities, selectivities, and adsorption energies and additionally uses weighting factors to reflect the specific requirements of a given process. To demonstrate the applicability of the API, we have performed the adsorption of carbon dioxide and methane at room temperature on a number of metal-organic frameworks, a zeolite and a molecular sieve carbon. The API is calculated for two different CO2/CH4 separation case scenarios: "bulk separation" and "natural gas purification". This comparison highlights how the API can be more versatile than previously proposed comparison factors for an initial indication of potential adsorbent performance.