A new metal-organic framework based on rare [Zn4F4] cores for efficient separation of C2H2

Assembly via 1,4-benzenedicarboxylate linkers and Zn²⁺ ions afforded an MOF containing rare [Zn₄F₄] cubane core, showing excellent separation for C₂H₂-CO₂ and C₂H₂-CH₄ mixtures. Dynamic breakthrough experiments and grand canonical Monte Carlo calculations were carried out to confirm the feasibility of the MOF for the separation application of C₂H₂.

New Crystal Forms for Biologically Active Compounds. Part 2: Anastrozole as N-Substituted 1,2,4-Triazole in Halogen Bonding and Lp-π Interactions with 1,4-Diiodotetrafluorobenzene

For an active pharmaceutical ingredient, it is important to stabilize its specific crystal polymorph. If the potential interconversion of various polymorphs is not carefully controlled, it may lead to deterioration of the drug’s physicochemical profile and, ultimately, its therapeutic efficacy. The desired polymorph stabilization can be achieved via co-crystallization with appropriate crystallophoric excipients. In this work, we identified an opportunity for co-crystallization of anastrozole (ASZ), a well-known aromatase inhibitor useful in second-line therapy of estrogen-dependent breast cancer, with a classical XB donor, 1,2,4,5-tetrafluoro-3,6-diiodobenzene (1,4-FIB). In the X-ray structures of ASZ·1.5 (1,4-FIB) co-crystal, different non-covalent interactions involving hydrogen and halogen atoms were detected and studied by quantum chemical calculations and QTAIM analysis at the ωB97XD/DZP-DKH level of theory.

An unusual cuprous iodide polymer incorporating I-, I2 and I3- structural units

A novel cuprous iodide polymer [Cu2(μ4-L)(μ2-I-)(I2)(I3-)]n·nI2 (1, L = 1-tetrazole-4-imidazole-benzene) has been hydrothermally synthesized. 1 contains a 1-D chain [Cu2(μ4-L)(μ2-I-)(I2)(I3-)]n and free I2 molecules, which are interconnected by weak II interactions to form an unprecedented 3-D cuprous polyiodide network containing rare 1-D [(I-)·2I2·(I3)-]n polyiodide ribbons. 1 shows luminescence and photoelectronic properties, and its theoretical band structure was also studied.

The utilization of a stable 2D bilayer MOF for simultaneous study of luminescent and photocatalytic properties: experimental studies and theoretical analysis

A new Pb(ii)-based 2D MOF comprising π-conjugated ligand 4'-(1H-tetrazol-5-yl)-[1,1'-biphenyl]-3,5-dicarboxylic acid (TZBPDC) and having the formula {[PbNa(TZBPDC)](H2O)(DMF)2} n (1) has been synthesized. Structural characterization of 1 indicates that the MOF has a 4-connected (4,4) motif. The photoluminescent investigation indicates that 1 can behave as potential luminescent sensor for the detection of nitroaromatic compounds (NACs), especially 2,4-dinitrophenol (2,4-DNP) and ferric ions, through the decrease in its luminescence intensity. Additionally, 1 also displays excellent capacity for the photodegradation of methylene orange (MO), which is a constituent of wastewater discharge. The most plausible mechanisms for the decrease in the luminescent intensity of 1 in the presence of different NACs have been explored though theoretical calculations, and the photocatalysis of 1 for organic dyes has been addressed using density of states (DOS) and partial DOS calculations.

A novel 3-D cuprous iodide polymer with a high Cu/I ratio

The interconnection of rare 1-D cationic aggregates [CuI3I²⁺]_n and anionic bi-tetrazolate bridges leads to the formation of a novel 3-D cuprous iodide polymer with a Cu/I ratio as high as 3, which shows unusually thermochromic luminescent properties.

Two new luminescence cadmium coordination polymers constructed by 4,4′-di(4H-1,2,4-triazol-4-yl)-1,1′-biphenyl and polycarboxylic acids: syntheses, structures, Fe3+ identifying and photo-degradable properties

Two Cd centered coordination polymers (CPs) constructed from triazole derivative and different polycarboxylic acids exhibit diverse structures and different behaviors on Fe³⁺ identifying and photo-degradation of MB.

Partial in Situ Reduction of Copper(II) Resulting in One-Pot Formation of 2D Neutral and 3D Cationic Copper(I) Iodide-Pyrazine Coordination Polymers: Structure and Emissive Properties

On the way to copper(I) iodide coordination polymers with specific luminescent properties, the in situ reduction of Cu(II) in the presence of KI and bidentate N-heteroatomic ligand, either pyrazine (pyz) or 4,4'-bipyridine (bpy), resulted in one two-dimensional and two three-dimensional new coordination networks. Starting from Cu(NO₃)₂·3H₂O in the presence of pyz, successive precipitation of known yellow [(Cu^II)₂(pyz)]_n, new orange [Cu^II(pyz)]_n, and new dark blue {[Cu^I(pyz)₂]·I₅}_n polymeric solids was observed. Starting from the same salt in the presence of bpy resulted in the successive precipitation of known yellow [(Cu^II)₂(bpy)]_n and new brown {[Cu^II(NO₃)(bpy)₂]·I₃·(dmf·H₂O)}_n coordination polymers. By using either Cu(CH₃COO)₂·H₂O or Cu(BF₄)₂ as starting materials, both known forms, yellow [(Cu^II)₂(bpy)]_n and orange [Cu^II(bpy)]_n, precipitated successively. The new solids were characterized by IR spectroscopy and X-ray analysis. [Cu^II(pyz)]_n represents the missing member in the row of two-dimensional coordination networks with general formula [Cu^IX(pyz)]_n (X = Cl, Br, I). Its steady state and time-resolved characterization together with DFT and TDDFT calculations revealed that the emission at room temperature is mainly delayed fluorescence originating from mixed singlet metal-to-ligand charge transfer and halide-to-ligand charge transfer states, while that at 77 K is phosphorescence, associated with the small singlet-triplet energy differences (ΔE = 70 meV).

A novel 3-D photoluminescent cuprous chloride polymer based on bifunctional imidazolate/tetrazolate bridges

The interconnection of rare [Cu₂Cl]⁺cations and multidentate 1-tetrazole-4-imidazole-benzene bridging ligands gives a novel 3-D cuprous chloride polymer with a bimodalfsc-3,5-Cmce-2 topological type (L⁻ligand and Cu⁺ion: orange and blue).