Insight into the Construction of (3,6)-Connected rtl, ant, and Chiral anh Nets Based on Structural Investigation of Several MOFs via Steric Tuning of Linkers

Six cobalt-organic frameworks (1-6) were solvothermally constructed with a tritopic pyridine-carboxylate linker (L-H) and its methyl- and methoxy-functionalized derivatives (L-OCH₃ and L-CH₃). Due to incorporated multiple substituents with various steric hindrances, the tritopic linkers adopt different molecular configurations, Y-shaped and T-shaped, which further combine octahedral or trigonal-prismatic inorganic nodes to afford diverse (3,6)-connected nets. Consequently, 1 and 2 are rtl nets and 3 and 4 are ant nets. Notably, 5 and 6 present rarely observed chiral anh (flu-3) networks with left-handed double helical chains. The structural investigation indicates that the steric tuning of linkers may essentially dictate the resulting diverse MOF structures. Furthermore, the MOFs presented here can be regarded as an ideal structural platform for a better understanding of the assembly of (3,6)-connected rtl, ant, and chiral anh nets, which are closely related to the shape and geometric configuration/conformation of tridentate organic nodes as well as inorganic building nodes.

Separation of C2/C1 hydrocarbons through a gate-opening effect in a microporous metal–organic framework

Here we report highly selective C2 separation from methane in a porous metal–organic framework.

Polycatenation tuned microporosity of two metal–tris(4′-carboxybiphenyl)amine frameworks with multilayer structures

By employing a nanosized tris(4′-carboxybiphenyl)amine ligand to assemble with Zn²⁺ ions, a novel trilayer network (FIR-37) and an unprecedented 2D → 3D microporous polycatenation framework (FIR-38) based on unusual tetralayers have been synthesized and structurally characterized.

Structures of Metal-Organic Frameworks with Rod Secondary Building Units

Rod MOFs are metal-organic frameworks in which the metal-containing secondary building units consist of infinite rods of linked metal-centered polyhedra. For such materials, we identify the points of extension, often atoms, which define the interface between the organic and inorganic components of the structure. The pattern of points of extension defines a shape such as a helix, ladder, helical ribbon, or cylinder tiling. The linkage of these shapes into a three-dimensional framework in turn defines a net characteristic of the original structure. Some scores of rod MOF structures are illustrated and deconstructed into their underlying nets in this way. Crystallographic data for all nets in their maximum symmetry embeddings are provided.

Crystal structure of poly[1,4-bis(2-methylbenzimidazol)butane-κ2N:N′)bis(4,4′-oxybis(benzoato-κ4O,O′:O′′,O′′′)dicadmium] monohydrate, C48H38Cd2N4O10

C48H38Cd2N4O10, monoclinic, C2/c (no. 15), a = 22.112(4) Å, b = 9.2100(18) Å, c = 22.977(5) Å, β = 93.24(3)°, V = 4671.8(16) Å3, Z = 4, Rgt(F) = 0.0341, wRref(F2) = 0.0868, T = 293(2) K.

Crystal structure of bis(μ3-isophthalato-κ3O:O′:O′′)(μ2-1,4-\ bis((2-propyl-1H-benzo[d]imidazol-1-yl)methyl)benzene-κ2N:N′)dizinc(II), C22H19N2O4Zn

C22H19N2O4Zn, triclinic,P1̅ (no. 2),a= 8.7451(17) Å,b= 8.9609(18) Å,c= 12.810(3) Å,α= 80.31(3)°,β= 82.66(3)°,γ= 69.90(3)°,V= 926.6(4) Å3,Z= 2,Rgt(F)= 0.0358,wRref(F2)= 0.0763,T= 293(2) K.

A Highly Water-Tolerant Magnesium(II) Coordination Polymer Derived from a Flexible Layered Structure

A two-dimensional (2D) layered Mg(II) coordination polymer (CP) with a high tolerance for H2 O was designed, synthesised, and crystallographically characterised. The synthesis was achieved by the introduction of a flexible 2D layered structure composed of Mg(II) ions and isonicotinate N-oxide ligands. Owing to its high H2 O tolerance, the obtained 2D layered structure has the flexibility to repeatedly adsorb a large amount of H2 O associated with interlayer expansion and enable the removal of H2 O from a H2 O/2-propanol mixed vapour. These results indicate that the CP could be an excellent dehydrating agent.

Crystal structure of catena-poly[diaquabis(μ2-3-carboxybenzene-1,2-dicarboxylato-1:2κ2 O:O′)-(μ2-1,4-bis(2-ethylbenzimidazol-1-ylmethyl)-benzene-1:1′κ2 N:N′)dizinc(II)], [Zn2(C26H26N4)(C9H4O6)2(H2O)2]

The structure of C22H19N2O7Zn, has a triclinic(P-1) symmetry. a = 8.1731(16) Å, b = 8.7150(17) Å, c = 15.396(3) Å, α = 75.40(3)°, β = 79.26(3)°, γ = 71.82(3)°, V = 1001.3(3) Å3, Z = 2, R gt (F) = 0.0320, wR ref(F 2) = 0.0768, T = 293(2) K.

A 3-D metal–organic framework with a rutile topology network, right- or left- handed helical chains and tunable UV-to-visible photoluminescence

A solvothermally synthesized 3-D Cd(ii) metal–organic framework with rutile topology was found containing right- or left- handed helices in its structure, and emitting tunable UV-to-visible photoluminescence.

Self-assembly synthesis of precursors to potential open framework alkali earth metal–organic complexes

A series of magnesium pyridinecarboxylic–dicarboxylic acid complexes, synthesised as precursors to potential framework materials, show a range of metal ligand and hydrogen bonding geometries. The pyridinedicarboxylic complexes show most promise as precursors for further syntheses.