Vol 45, No 12 (2019)

The known metal-organic framework {Zn₄O(BDC)₃} (MOF-5 (I), where BDC is terephthalate anion) is synthesized by the solvothermal method in autoclaves prepared by 3D printing from polypropylene. The synthesized polymer is isolated in the individual state and characterized by elemental analysis and powder X-ray diffraction analysis. The crystal structures of MOF-5 and another coordination polymer based on zinc(II) terephthalate {Zn₄O(BDC)₃} · (ZnO)_0.125 (SUMOF-2 (II)) obtained as a by-product of the solvothermal synthesis are confirmed by X-ray diffraction analysis (СIF files ССDС nos. 1920366 (I) and 1926136 (II)).

New cyclometalated iridium(III) complexes, NBEpicIr(Ppy)₂ (I) and NBEpicIr(Dfppy)₂ (II), were synthesized (NBEpicH = 3-(((1S,4S)-bicyclo[2.2.1]hept-5-ene-2-carbonyl)oxy)picolinic acid, PpyH = 2-phenylpyridine, DfppyH = 2-(2,4-difluorophenyl)pyridine). Complex I was characterized by X‑ray diffraction analysis (CIF file CCDC no. 1878882). Ring opening metathesis polymerization involving compounds I and II and carbazole norbornene monomers gave new iridium-containing copolymers. The photophysical properties of complexes I and II and copolymers based on them were studied.

Complexes of dioxomolybdenum(VI) of the molecular (МоО₂Сl₂ · 2H₂L) and inner complex ([MoO₂L · Solv]) types are synthesized (H₂L are azomethines, derivatives of disubstituted R¹,R²-salicylaldehydes (R¹, R² = 3.5-Вr₂; R¹ = 3-МеО, R² = 5-Вr) and monoethanolamine; Solv is a methanol, dimethylformamide, pyridine, or α-picoline molecule). The cis-octahedral structure of the complexes is concluded on the basis of the IR spectroscopic data. In the molecular compounds, the ligands are coordinated via the O atom of the carbonyl group of the H₂L tautomeric form. In the inner complex compounds, the ligands are coordinated in the deprotonated benzoid form. The structure of [MoO₂(L¹) · МеОН] (I) (where L¹ is C₉H₇Br₂NO₂) is determined by X-ray diffraction analysis (СIF file CCDC no. 1898088). In the mononuclear molecule of compound I, the Mo atom has the octahedral coordination by two oxo ligands, two oxygen atoms, the nitrogen atom of the tridentate bis(chelate) two-charge ligand (L¹)^2–, and the O atom of the methanol molecule. The neutral N(1) and O(1) atoms of the L¹ and МеОН ligands, respectively, are arranged in the trans positions to the O(oxo) ligands. The Mo–N(1) (2.265 Å) and Мо–О(1) (2.372 Å) bonds are substantially elongated due to the structural manifestation of the trans effect of the multiply bonded oxo ligands. The intermolecular hydrogen bonds (МеОН)О–Н···О(oxo) join the molecules into supramolecular 1D chains.

A series of six tin(IV) complexes [SnCl₂(L) (I), Me₂Sn(L) (II), Bu₂Sn(L) (III), Ph₂Sn(L) (IV), Oct₂Sn(L) (V), BuSnCl(L) (VI)] derived from N,N'-bis(2-hydroxy-1-naphthylidene)-1,2-diaminobenzene [LH₂] have been synthesized. The obtained compounds were characterized by elemental analysis, mass spectrometry, FT-IR and NMR (¹H, ¹³C) spectroscopy. The crystal structures of compounds (IV) and (VI) have also been determined by single crystal X-ray analysis (CIF files CCDC nos. 856596 (IV) and 856595 (VI)). The study revealed that the complexes exist as discrete monomeric species and the tin atom is hexa-coordinated in a distorted octahedral geometry. The two phenyl groups in compound (IV) are at trans-positions. Similarly, in complex (VI) the butyl and chloro groups also adopt trans-orientation. The in vitro antibacterial screening and cytotoxicity investigations revealed that the biological activities significantly depend upon the alkyl or others groups present on tin atom. Most of the tin(IV) complexes are active against Escherichia coli and highest activity is shown by complex (IV) against Bacillus subtilis. Furthermore, complex (IV) has also demonstrated the highest cytotoxicity against brine shrimp with LD₅₀ value 0.858 μg/mL.