Yu-Bin Dong

Highly efficient iodine species enriching and guest-driven tunable luminescent properties based on a cadmium(II)-triazole MOF.

The first example of highly efficient iodine enrichment based on a Cd(II)-triazole MOF (1) via both molecular sorption and ion-exchange approaches is reported.

Sol–solvothermal synthesis and microwave evolution of La(OH)3 nanorods to La2O3 nanorods

Solvothermal synthesis of La(OH)3 sol and microwave radiation drying of La(OH)3 nanorods were employed for the first time to synthesize La2O3 nanorods with diameters around 10 nm and lengths up to 200 nm. The resulting products were characterized with XRD, TEM and HRTEM. Microwave radiation drying was found to be more effective to maintain the morphologies of nanorods than conventional drying.

Guest-driven luminescence: lanthanide-based host-guest systems with bimodal emissive properties based on a guest-driven approach.

A series of discrete closed, semi-closed, and polymeric lanthanide-based [{Ln(H(2)O)(8)}(3+)subsetLn(III)(2)L(4)] host-guest systems with tetragonal prism-like structure have been designed and synthesized through the ligand-dominated approach. These nanoscopic cages are robust and can be maintained upon guest exchange. Within the restricting space, the luminescence intensity of the encapsulated [Ln(H(2)O)(8)](3+) species is dramatically enhanced due to the vibrational movements originating from the O-H oscillators in the coordinated water molecules being effectively reduced by the host-guest H-bonding interactions. Based on the guest-driven approach, tunable emission and bimodal emission (UV/Vis/NIR) of these [{Ln(H(2)O)(8)}(3+)subsetLn(III)(2)L(4)] supramolecular systems are successfully realized. Moreover, the strong luminescence originating from [{Ln(H(2)O)(8)}(3+)subsetLn(III)(2)L(4)] host-guest system can be quenched by encapsulation of d-block metal quenchers, such as Fe(3+) and Cu(2+), through solid-state f-d metal exchange. Additionally, this study demonstrates that the photoinduced solid-state guest-independent emission spectrum could be one of the most diagnostic techniques for monitoring the solid-state guest-exchange process.

Encapsulation of Ln3+ hydrate species for tunable luminescent materials based on a porous Cd(II)-MOF

This work builds on the recently developed guest-driven approach for the construction of tunable luminescent materials based on porous metal–organic frameworks (MOFs). The porous heteroatom-rich Cd(II)-MOF (1) material has been obtained by the reaction of Cd(NO3)2 with 3,5-bis(3-carboxyphenyl)-1,2,4-triazole)/4,4′-bis(4-pyridyl)ethane in solution. Compound 1 features (4,4) sheets which interlock together to generate a 2-fold interpenetrating robust framework containing ellipse-like channels with pore dimensions of ca. 9 × 11 A. In particular, 1 is able to trap lanthanide hydrate cationic species such as Eu(H2O)83+ and Tb(H2O)83+ and to sensitize their emissions in the solid state. Furthermore, the emission colors could be tuned by changing the co-doped Eu3+/Tb3+ ratio in the Cd(II)-MOF to provide barcode-like luminescent materials.

Independent 1D nanosized metal-organic tube: anion exchange, separation, and anion-responsive luminescence.

Three independent 1D metal-organic nanotubes AgL(2)X(2) [X = PF(6)(-) (1), ClO(4)(-) (2), and SbF(6)(-) (3)] with anion exchange, separation, and anion-responsive photoluminescence are reported.

Luminescent humidity sensors based on porous Ln3+-MOFs

Two new types of luminescence-based Ln3+-MOF humidity sensors have been reported. The humidity sensing is successfully realized by controlling O–H oscillators on the Ln3+ emitters through host–guest H-bonding interactions.

Adsorption and separation of organic six-membered ring analogues on neutral Cd(II)-MOF generated from asymmetric schiff-base ligand.

A new CdL(2)-MOF was synthesized based on an asymmetric Schiff-base ligand LH, which is obtained by condensation of 5-formyl-8-hydroxyquinoline and 3-pyridinecarboxylic acid hydrazide. A series of organic six-membered ring analogues, namely, 1,4-dioxane, cyclohexane, cyclohexene, benzene, cyclohexanone, and cyclohexanol, can be absorbed by the CdL(2) porous framework in liquid-phase to generate G(n)⊂CdL(2) (n = 1 and 2) host-guest complexes. In addition, the CdL(2) host framework displays different affinity for these six-membered ring substrates and can effectively separate them under mild conditions (i.e., 1, 4-dioxane > cyclohexane > cyclohexene and benzene > cyclohexanone > cyclohexanol). The empty CdL(2) displays strong green-yellow emission. Furthermore, these host-guest systems show an interesting guest-driven luminescent emission, and the emission intensities of these guest-loaded complexes are effectively reduced.

Rational design of carbon and TiO2 assembly materials: covered or strewn, which is better for photocatalysis?

The rational design of carbonaceous hybrid nanostructures is very important for obtaining high photoactivity. TiO2 particles strewn with an optimal quantity of carbon nanodots have a much higher photoactivity than that of TiO2 covered with a carbon layer, showing the importance of carbon morphology in the photocatalysis of carbonaceous hybrid nanostructures.

Bifunctional Imidazolium-Based Ionic Liquid Decorated UiO-67 Type MOF for Selective CO2 Adsorption and Catalytic Property for CO2 Cycloaddition with Epoxides

A bifunctional robust and highly porous imidazolium-based ionic liquid decorated UiO-67 type MOF (UiO-67-IL, 1) was successfully constructed via solvothermal assembly of the imidazolium-based ligand and Zr(IV) ions. It exhibits a highly selective adsorption for CO2 over CH4 and N2. Furthermore, 1 herein can be used as a highly active heterogeneous catalyst for CO2 cycloaddition with epoxides under atmospheric pressure with or without cocatalyst TBAB (n-Bu4NBr).

Au@Cu(II)-MOF: Highly Efficient Bifunctional Heterogeneous Catalyst for Successive Oxidation-Condensation Reactions.

A new composite Au@Cu(II)-MOF catalyst has been synthesized via solution impregnation and full characterized by HRTEM, SEM-EDS, XRD, gas adsorption-desorption, XPS, and ICP analysis. It has been shown here that the Cu(II)-framework can be a useful platform to stabilize and support gold nanoparticles (Au NPs). The obtained Au@Cu(II)-MOF exhibits a bifunctional catalytic behavior and is able to promote selective aerobic benzyl alcohol oxidation-Knoevenagel condensation in a stepwise way.