3D Coordination Framework with Uncommon Two-Fold Interpenetrated {33⋅59⋅63}-lcy Net and Coordinated Anion Exchange

Crystal structure of bis{1-[(benzotriazol-1-yl)methyl]-1H-1,3-(2-methyl-imidazol)}di-chloridomercury(II), [Hg(C11H11N5)2Cl2], C22H22N10Cl2Hg

C22H22N10Cl2Hg, triclinic, P 1 ‾ $P‾{1}$ (no. 2), a = 8.2034(4) Å, b = 12.7859(7) Å, c = 13.5026(7) Å, α = 66.069(5)°, β = 79.964(4)°, γ = 84.465(4)°, V = 1274.18(12) Å3, Z = 2, R gt (F) = 0.0372, ωR ref (F 2) = 0.0670, T = 291.15 K.

Crystal structure of Bis{1-[(benzotriazol-1-yl)methyl]-1-H-1,3-(2-methyl-imidazol)}diiodidocadmium(II), [Cd(C11H11N5)2I2], C22H22N10I2Cd

C22H22N10I2Cd, triclinic, P1̄ (no. 2), a = 10.5476(8) Å, b = 11.1759(9) Å, c = 12.7735(10) Å, α = 103.372(7)°, β = 105.811(7)°, γ = 100.270(6)°, V = 1361.85(18) Å3, Z = 2, R gt(F) = 0.0324, wR ref(F 2) = 0.0661, T = 291(2) K.

Porous functionalized MOF self-evolution promoting molecule encapsulation and Hg2+ removal

Porous functionalized MOF self-evolution has successfully improved the Hg²⁺ removal performance and implemented dye molecule encapsulation.

Tetranuclear cobalt(ii)-isonicotinic acid frameworks: selective CO2 capture, magnetic properties, and derived "Co3O4" exhibiting high performance in lithium ion batteries

Two new 3D cobalt metal-organic frameworks (MOFs), [Co4(CH3COO)(in)5(μ3-OH)2]·2H2O (1) and [Co4(SO4)2(in)4(DMF)2]·3DMF (2) (Hin = isonicotinic acid), have been prepared through the anion template method. Compound 1 consists of rare odd-number connected (9-connected) cubane-like SBUs, while compound 2 consists of 8-connected high-symmetry square-planar clusters. Magnetic studies indicate that compound 1 exhibits spin-canting antiferromagnetic ordering, while compound 2 shows antiferromagnetic behavior. At 273 K and 1 bar, compound 1 exhibits a high CO2 selectivity over CH4 and a significant CO2 uptake of 13.6 wt%, which is higher than that of 2 (8.5 wt%). Furthermore, compound 1 was then transformed into ultrasmall Co3O4 nanoparticles via simple but effective annealing treatment. Electrochemical measurements show that the Co3O4 nanospheres derived from compound 1 exhibited high and stable lithium storage properties (1100 mA h g-1 after 100 cycles at 200 mA g-1) and excellent rate capabilities.

Mechanisms of Solvent-Mediated Structural Transformations for Dynamic Crystals of Supramolecular Coordination Systems

Thus far, reports about the transformations for dynamic crystals of supramolecular coordination systems mainly include single-crystal-to-single-crystal reactions, and solvent-mediated processes. This Concept focuses on the mechanisms for solvent-mediated structural transformations of dynamic crystals, which can be classified into two categories, that is, core-on-shell and core-to-core. The core-on-shell mechanism means that the core of the new crystal is generated from the shell of original crystal, being concomitant with the dissolution of the mother crystal. In contrast, for the core-to-core case, the growth of new crystal core and the dissolution of original crystal core will proceed simultaneously, but they are physically separated. Herein, the two mechanisms are elucidated in detail, with some typical examples from recent advances.

Crystal structure of bis{1-[(benzotriazol-1-yl)methyl]-1-H-1,3-(2-methyl-imdazol)-κN}-dithiocyano-κN-zinc(II) C24H22N12S2Zn

C24H22N12S2Zn, monoclinic, C2/c (no. 15), a = 27.6123(9) Å, b = 9.6238(4) Å, c = 21.1748(8) Å, β = 101.088(4)°, Z = 8, V = 5521.8(4) Å3, R gt(F) = 0.0481, wR ref(F 2) = 0.1047, T = 291(2) K.

Vapour-driven crystal-to-crystal transformation showing an interlocking switch of the coordination polymer chains between 1D and 3D

A rare crystal-to-crystal transformation occurs between 1D coordination polymer chains and 3D mechanically interlocked structures via reversible opening and closing of the homogeneous chains without any change in the coordination mode and composition.

Structures and single crystal to single crystal transformations of cadmium frameworks using a flexible tripodal ligand

Various cadmium coordination polymers were constructed using a flexible tris-imidazole ligand and they showed single crystal to single crystal transformations during anion exchange.

Anion exchange coupled with the reduction and dimerisation of a copper(ii) nitrate complex of tripyridyl dithioether via a single-crystal-to-single-crystal transformation

It is a challenge to develop methodologies involving multiple transformations for preparing new materials that cannot be obtained via direct synthesis. Herein, we report an anion exchange process accompanying cation reduction and dimerisation via a single-crystal-to-single-crystal transformation. First, a direct reaction of the flexible tripyridyl dithioether ligand L with CuI afforded a mixture of four bis(ligand) complexes (1a-1d). To avoid the formation of undesired mixed products, a copper(ii) nitrate complex-mediated approach involving anion exchange and cation reduction was employed to generate a monomeric complex, [CuII(L)NO3]NO3·toluene (2). When the dark blue crystals of 2 were immersed in an aqueous NaI solution, the crystals were transformed to a pale yellow dimeric copper(i) iodide complex, [(μ-CuI2I2)(L)2] (3). The observed anion exchange promotes the reduction of copper(ii) to copper(i) at the expense of I-/I3- oxidation as well as dimerisation via the formation of a Cu2I2 cluster. This result corresponds to the synthesis of a compound that otherwise was not able to be prepared via a direct synthetic procedure.

Solvent-mediated preparation of a heterometallic [2 × 2] grid via a 1D metal–organic template with extraordinary acid/base-resistance

Here, we have demonstrated that a metal–organic chain can serve as a template to prepare a heterometallic [2 × 2] grid through a solvent-mediated strategy.

Metal-controlled structural variations of coordination architectures constructed from flexible 1H-benzimidazole-1-propionic acid

Five low-dimensional coordination polymers and a novel discrete dodecametallic cage have been obtained from appropriate transition metals in combination with a flexible bifunctional benzimidazole carboxylic acid.

Substituted group directed assembly of zinc coordination compounds based on bifunctional ligands, from mono, di to tristetrazole–carboxylate

Four new tetrazole–carboxylate ligands have been reacted with zinc salts, resulting in the formation of four compounds with enhanced luminescence properties and structures that are controlled by the number, different coordination modes and substitution of the ligands.

Solvent-mediated crystal-to-crystal transformations from a cationic homometallic metal–organic framework to heterometallic frameworks

A new strategy for the synthesis of heterometallic metal–organic frameworks (MOFs) was presented. Two unprecedented heterometallic MOFs were successfully prepared through solvent-mediated crystal-to-crystal transformations from a monometallic cationic MOF.