Among the recent developments in metal-organic frameworks (MOFs), porous layered coordination polymers (CPs) have garnered attention due to their modular nature and tunable structures. These factors enable a number of properties and applications, including gas and guest sorption, storage and separation of gases and small molecules, catalysis, luminescence, sensing, magnetism, and energy storage and conversion. Among MOFs, two-dimensional (2D) compounds are also known as 2D CPs or 2D MOFs. Since the discovery of graphene in 2004, 2D materials have also been widely studied. Several 2D MOFs are suitable for exfoliation as ultrathin nanosheets similar to graphene and other 2D materials, making these layered structures useful and unique for various technological applications. Furthermore, these layered structures have fascinating topological networks and entanglements. This review provides an overview of different aspects of 2D MOF layered architectures such as topology, interpenetration, structural transformations, properties, and applications.

Two-Dimensional Metal-Organic Framework Materials: Synthesis, Structures, Properties and Applications.

Luminescent Lanthanide Metal Organic Frameworks (LnMOFs): A Versatile Platform towards Organomolecule Sensing

Issues and opportunities facing hydrolytic hydrogen production materials

Five isostructural lanthanide metal-organic frameworks, [Ln(BDPO)(H2O)4] (Ln= Eu for CUST-623, Tb for CUST-624, Gd for CUST-625, Dy for CUST-626, Sm for CUST-627, BDPO = N, N' bis (3,5 - dicarboxyphenyl)-oxalamide)...

Lanthanide-MOFs as Multifunctional luminescence Sensors

Heterometallic CuII–LnIII complexes: Single molecule magnets and magnetic refrigerants

The second quantum revolution harnesses exquisite quantum control for a slate of diverse applications including sensing, communication, and computation. Of the many candidates for building quantum systems, molecules offer both tunability and specificity, but the principles to enable high temperature operation are not well established. Spin–lattice relaxation, represented by the time constant T1, is the primary factor dictating the high temperature performance of quantum bits (qubits), and serves as the upper limit on qubit coherence times (T2). For molecular qubits at elevated temperatures (>100 K), molecular vibrations facilitate rapid spin–lattice relaxation which limits T2 to well below operational minimums for certain quantum technologies. Here we identify the effects of controlling orbital angular momentum through metal coordination geometry and ligand rigidity via π-conjugation on T1 relaxation in three four-coordinate Cu2+S = ½ qubit candidates: bis(N,N′-dimethyl-4-amino-3-penten-2-imine) copper(ii) (Me2Nac)2 (1), bis(acetylacetone)ethylenediamine copper(ii) Cu(acacen) (2), and tetramethyltetraazaannulene copper(ii) Cu(tmtaa) (3). We obtain significant T1 improvement upon changing from tetrahedral to square planar geometries through changes in orbital angular momentum. T1 is further improved with greater π-conjugation in the ligand framework. Our electronic structure calculations reveal that the reduced motion of low energy vibrations in the primary coordination sphere slows relaxation and increases T1. These principles enable us to report a new molecular qubit candidate with room temperature T2 = 0.43 μs, and establishes guidelines for designing novel qubit candidates operating above 100 K.

/pdf/chemical-control-of-spin-lattice-relaxation-to-discover-a-3uc4loy1.pdf

Chemical control of spin–lattice relaxation to discover a room temperature molecular qubit

Five novel lanthanide metal–organic frameworks constructed from a π-conjugated ligand with tetracarboxylate group, 5,5′-(naphthalene-1,5-diyl)diisophthalic acid, have been synthesized solvothermall...

Five Lanthanide-Based Metal–Organic Frameworks Built from a π-Conjugated Ligand with Isophthalate Units Featuring Sensitive Fluorescent Sensing for DMF and Acetone Molecules

Cobalt-nickel bimetal carbon sphere catalysts for efficient hydrolysis of sodium borohydride: The role of synergy and confine effect

Rapid detection of explosives and fingerprint development are of great significance to the detection of cases. Lanthanide metal–organic framework materials (Ln-MOFs) not only have various structures, but also have unique luminescence properties, which is a promising fluorescence sensing material. Herein, a strong red fluorescent Eu-MOFs ([Eu3(μ3-OH)(NDC)3(HCOO)3)] which were assembled by a 12-linked secondary unit ([Eu3(μ3-OH)(COO)6] with a linear dicarboxylic acid ligand H2NDC (2,6-naphthalic acid) was selected as a chemical sensor to selectively detect common nitro explosives through the phenomenon of fluorescence quenching. The results showed that the Eu-MOF exhibited high selectivity and sensitive fluorescence quenching response to picric acid (PA), and could be reused after being washed with ethanol. In addition, the strong fluorescence of Eu-MOF powder leads to its application in developing sweat-sebum latent fingerprints on different impermeable surfaces successfully via the powder dusting method. Therefore, it is expected to play an nonnegligible role in the investigation and trial. 

A luminescent Eu-based MOFs material for the sensitive detection of nitro explosives and development of fingerprint

A New Family of 2D Coordination Polymers Based on 3d-4f 15-Metallacrown-5 Units: Synthesis, Structure, and Single-Molecule Magnet Behavior

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