Том 44, № 7 (2018)

A new MOF of [Co(HCOO)₂] · 0.33DMF (I) was prepared and characterized by IR, powder X-ray diffraction, and single-crystal X-ray diffraction (CIF file CCDC no. 1571166). Complex I exhibits a diamond framework based on Co-centered CoCo₄ tetrahedral nodes, in which all metal ions have octahedral coordination geometry and all HCOO groups link the metal ions in syn-syn/anti modes. The magnetic property shows a main antiferromagnetic interaction and the ferromagnetic phase transition below 2 K. Furthermore, the photocatalytic properties of I for degradation of the methyl violet and Rhodamine B have been explored.

One three-dimensional Sr(II) coordination polymer [C₆(MIm)₂][Sr₃(1,4-NDC)₄] (I) (C₆(MIm)₂ = 1,3-bis(3-methylimidazolium-1-yl)hexyl, 1,4-H₂NDC = 1,4-naphthalenedicarboxylate acid) has been synthesized using an ionothermal method and structurally characterized by IR spectroscopy, UV-Vis spectroscopy, XRPD, and X-ray single-crystal structure analysis (СIF file CCDC 1033958). Two types of strontium centers are bridged by two coordination modes of 1,4-H₂NDC ligands to form a Sr(II) chain. Each Sr(II) chain is crossconnected to four other chains to generate a 3D coordination polymer, in which C₆(MIm)₂²⁺ cations as charge balancing species are filled in the channels of the anionic framework. The polymeric solid of I exhibits strong luminescent emission at room temperature.

A new cobalt(II) coordination polymer, namely [Co(L)(Ndc)]_n (I), where L = 1,5-bis(5,6- dimethylbenzimidazole)pentane, H₂Ndc = 2,6-naphthalenedicarboxylic acid, was synthesized and characterized by elemental analysis, IR spectra, powder X-ray diffraction and single-crystal X-ray diffraction (CIF file CCDC no. 1548044). Complex I displays a 2D (4,4) layer which further extended into a 3D supramolecular framework via weak C–H···O hydrogen bondings. The luminescence explorations demonstrated that I exhibits highly selective and sensitive sensing for Cr₂O₇²⁻ with high quenching efficiency K_sv value of 9.87 × 10³ L mol⁻¹ and low detection limit (0.24 μM (S/N = 3)). Meanwhile I also exhibits highly selective and sensitive sensing for Fe³⁺ with quenching efficiency K_sv = 3.6 × 10⁴ L mol^–1 and low detection limit (0.32 μM (S/N = 3)). Complex I exhibits higher photocatalytic activities for the degradation of methylene blue under UV irradiation. Additionally, the thermal behavior and electrochemical properties of the compound are also presented.

Treatment of o-carborane, n-butyllithium, sulfur (or selenium) and MeCpCo(CO)I₂ (or Cp*Co(CO)I₂) (Cp* = pentamethylcyclopentadienyl) under argon leads to half-sandwich carborane complex MeCpCo(S₂C₂B₁₀H₁₀) (I) (or Cp*Co(Se₂C₂B₁₀H₁₀) (II)). Complex I reacts with triphenylphosphine to afford addition product MeCpCo(S₂C₂B₁₀H₁₀)(PPh₃) (III). However, II does not react with triphenylphosphine. Complexes II and III have been characterized by elemental analysis, mass, NMR spectroscopy, IR and X-ray structural analyses (CIF files CCDC nos. 1571705 (II) and 1571706 (III)).

One polyoxometalate-based silver(I) compound [Ag(2,2'-Bipy)₂]₃(PW₁₂O₄₀) (I) (2,2'-Bipy = 2,2'- bipyridine) has been synthesized and structurally characterized by IR spectroscopy, elemental analysis, XRPD and X-ray single-crystal structure analysis (CIF file CCDC no. 1572216). Compound I exhibits a crystalline three-dimentional supramolecular framework constructed by Ag-2,2'-Bipy coordination units and [PW₁₂O₄0]³⁻ template anions, in which there are multiform π...π interactions and hydrogen bonds. The cyclic voltammetric experiments show that compound I displays a good electrocatalytic activity toward the reduction of nitrite.