卷 50, 编号 1 (2024)

The reactions of zinc(II) bromide with 3- and 4-iodobenzonitriles (3-I-BzCN and 4-I-Bz-CN) afford heteroligand complexes [L₂ZnBr₂] (L = 3-I-BzCN (I) and 4-I-BzCN (II)), whose structures are determined by X-ray diffraction (XRD) (CIF files CCDC nos. 2253175 (I) and 2253176 (II)). Both crystal structures contain halogen bonds I···Br linking the [ZnBr₂L₂] fragments into supramolecular layers (I) or chains (II). The energies of these noncovalent interactions are estimated by quantum-chemical calculations.

Biocompatible metal-organic framework MIL-100(Fe) was used as a container for a model hydrophobic active pharmaceutical ingredient, ibuprofen, in composite films based on gelatin, pectin, and kappacarrageenan. According to powder X-ray diffraction and scanning electron microscopy data, the metal-organic framework retained the crystal structure and its particles were uniformly distributed throughout the hydrocolloid matrix. Testing of the obtained film materials under simulated biological conditions using chromatography – mass spectrometry analysis showed that they are applicable as a dosage form for slow release of active pharmaceutical ingredients.

New crystalline pseudo-polymer complex [Au{S₂CN(CH₂)₆}₂]₄[Ag₅C_l9] (I) was prepared by inding gold(III) with silver(I) dithiocarbamate from an AuCl₃/2.5 M NaCl solution. Complex I is isolated in a preparative yield and structurally characterized. The X-ray diffraction (XRD) data (CIF file CCDC no. 2205197) show that the isomeric cations [Au{S₂CN(CH₂)₆}₂]⁺ (A : 2B : C) and complicated pentanuclear anion [Ag₅C_l9]^4– are the main structural units of the compound. The supramolecular self-organization of the ionic structural units in complex I occurs due to multiple secondary interactions Cl···S and Ag···S, hydrogen bonds C–H···Cl, and anagostic interactions C–H···Ag leading to the formation of the 3D pseudo-polymer framework. The thermal behavior of complex I is studied by simultaneous thermal analysis to find that the thermolysis of the double Au(III)—Ag(I) compound is accompanied by the quantitative regeneration of the bound metals under comparatively mild conditions.

A series of gold(I) monoisocyanide [AuCl(C₆H₄–4-X)] (X = Cl (IIa), Br (IIb), I (IIc) and bis-isocyanide [Au(C₆H₄–4-X)₂](PF₆) (X = Cl (IIIa), Br (IIIb), I (IIIc) complexes were prepared by the reaction of [AuCl(Tht)] (Tht = tetrahydrothiophene) with the specified isocyanide. The molecular structure of IIa – IIc was established by X-ray diffraction (CCDC no. 2253450 (IIa), 2253447 (IIb), 2253448 (IIc)). The crystals of IIb and IIc are isostructural; they were found to have several types of intermolecular interactions, particularly, C–X⋯Cl – Au halogen bonds, π-hole (CCNR) ⋯ (Au) interactions, and Au⋯Au aurophilic contacts, which form together a two-layer 2D supramolecular polymer. The crystals of IIb, IIc and IIIa, IIIb exhibit phosphorescence at room temperature; compounds IIa and IIIc do not possess luminescent properties; and mechanical grinding of IIa – IIc and IIIa – IIIc powders does not change the photophysical properties.