A zinc(II) coordination polymer material with Lewis basic pyridyl sites: Structure, photoluminescence, and heterogeneous catalysis

Non-porous interpenetrating Co-bpe MOF for colorimetric iodide sensing

MOFs with their accessible voids/channels have been explored immensely for sensing due to their exclusive host-guest chemistry. However, unavailability of pores/voids in interpenetrating non-porous MOFs limits their applications in sensing. We herein report for the first time, hitherto, a non-porous MOF with an interpenetrating ladder structure for iodide sensing. A Co-bpe MOF was synthesized by hydrothermal reaction between cobalt nitrate and 1,2-bis(4-pyridyl)ethylene (bpe) in methanol and tested against colorimetric sensing of halides. The supramolecular structure of the Co-bpe MOF was stabilized through strong hydrogen bonding. We propose a double nucleophilic substitution reaction mechanism for iodide detection, which is one of its own kind. While Co-bpe showed a significant color change from dark maroon to dark green in the presence of iodide, the rest of halides did not display any pronounced colorimetric effect. The limit of detection (LOD) of this material was found to be 2.7 × 10^-7 M. This article focuses on the equal competency of non-porous MOF materials with the porous MOFs in sensing applications.

Crystal structure of trans-tetraaqua-bis{2-carboxy-4-((5-carboxypyridin-3-yl)oxy)benzoato-κ1 N}cobalt(II) dihydrate C28H28O20N2Co

C28H28O20N2Co, triclinic, P 1 ‾ $P‾{1}$ (no. 2), a = 7.7951(3) Å, b = 9.3511(4) Å, c = 11.3352(4) Å, β = 105.499(4)°, Z = 1, V = 762.19(6) Å3, R gt (F) = 0.0339, wR ref (F 2) = 0.0798, T = 293.0 K.

Viologen-derived material showing photochromic, visually oxygen responsive, and photomodulated luminescence behaviors

A new 2D viologen-derived Zn(ii) photochromic material exhibits photochromic, visually oxygen responsive, and photomodulated luminescent behaviors.

Construction of a viologen-derived 2D material with photochromism, photoswitchable luminescence and inkless and erasable prints via sunlight irradiation

A Zn(ii) material based on thiophenedicarboxylate and viologen derivative mixed ligands is synthesized. Thanks to pyridinium unit embedded in its structure, the material exhibits a rapid photochromic response via sunlight irradiation.

Crystal structure of bis(6-aminopyridine-2-carboxylato-κ2 O,N)-copper(II), C12H10O6N4Cu

C12H10O6N4Cu, monoclinic, P21/c (no. 14), a = 3.7015(2) Å, b = 7.3920(4) Å, c = 21.3535(12) Å, β = 91.060(5)°, Z = 2, V = 584.16(6) Å3, R gt(F) = 0.0319, wR ref(F2) = 0.0769, T = 293 K.

Insight into the effects of electronegativity on the H2 catalytic activation for CO2 hydrogenation: four transition metal cases from a DFT study

Electronegativity of transition metal dominates the type of H species, which has an important effect on the path choice of CO₂ hydrogenation.

Crystal structure of poly[diaqua-bis(μ2-3-((1H-imidazol-1-yl)methyl)benzoato-κ2N:O)manganese(II)], C22H22MnN4O6

C22H22MnN4O6, monoclinic, P21/n, a = 11.9331(7) Å, b = 5.5962(3) Å, c = 16.0671(9) Å, β = 107.391(6)°, Z = 2, V = 1023.92(11) Å3, Rgt(F) = 0.046, wRref (F2) = 0.055, T = 287 K.

MgH2/CuxO Hydrogen Storage Composite with Defect-Rich Surfaces for Carbon Dioxide Hydrogenation

Thermal conversion of CO₂ to value-added chemicals is challenging due to the extreme inertness of the CO₂ molecule and the low selectivity of products. We reported a defect-rich MgH₂/Cu_xO hydrogen storage composite from mechanochemical ball-milling for the catalytic hydrogenation of CO₂ to lower olefins. The defect-rich MgH₂/Cu_xO hydrogen storage composite achieves a C₂⁼-C₄⁼ selectivity of 54.8% and a CO₂ conversion of 20.7% at 350 °C under a low H₂/CO₂ ratio of 1:5, which increases the efficiency of H₂ utilization by offering lattice H^- species for hydrogenation. Density functional theory calculations show that the defective structure of MgH₂/Cu_xO can promote CO₂ molecule adsorption and activation, while the electronic structure of MgH₂ is beneficial for offering lattice H^- for CO₂ molecule hydrogenation. The lattice H^- can combine the C site of CO₂ molecule to promote the formation of Mg formate, which can be further hydrogenated to lower olefins under a low H^- concentration. This work for CO₂ conversion by a defect-rich MgH₂/Cu_xO hydrogen storage composite can inspire the catalysts design for the hydrogenation of CO₂ to lower olefins.