Koordinacionnaâ himiâ

In the present work, the influence of the nature of the solvate molecules and N-donor ligands on the structures of the benzoate–pentafluorobenzoate europium complexes was investigated. It was established that the reaction of europium benzoate (bz) and pentafluorobenzoate (pfb) with 1,10-phenanthroline (phen) in acetonitrile in the presence of toluene, o-xylene, or dichloromethane leads to the formation of compounds [Eu₂(phen)₂(pfb)₄(bz)₂]·4C₆H₅CH₃ (I), [Eu₂(phen)₂(pfb)₄(bz)₂]·4C₆H₄(CH₃)₂ (II), and [Eu₂(phen)₂(pfb)₄ (bz)₂]·2.898CH₂Cl₂ (III), respectively, which possess similar structures. Using quinoline (quin) as the N-donor ligand, mixed-carboxylate coordination polymer crystals [Eu(H₂O)(pfb)₂(bz)]_n·2n(quin) (IV) were obtained in good yield. The synthesized compounds were characterized by single-crystal X-ray diffraction, IR spectroscopy, and CHN elemental analysis. Non-covalent interactions were analyzed by Hirshfeld surface analysis.

A carbonyl-isonitrile complex of [Re(CO)₃(L)(m-XylylNC)]OTf formulation (m-XylylNC – 2,6-dimethyl-phenyl isocyanide) was synthesized based on the 1,10-phenanthroline ligand (L) containing a menthol fragment (MtO^–) in position 2. The Re(I) atom in the cationic part of this complex has a distorted octahedral environment formed by the N,N′-chelate ligand L, one isonitrile ligand, and three CO ligands. The resulting compound exhibits bright green phosphorescence at room temperature in both the solid state and solution, with quantum yields of 15% and 10%, respectively.

The reaction of manganese(II) chloride with the azomethine ligand 4-{[(1H-pyrrol-2-yl)methylene]amino}-4H-1,2,4-triazole (HPyrtrz) yielded crystals of the 1D-polymeric compound [Mn^II(HPyrtrz)(H₂O)Cl₂]_n (I). The addition of the co-ligand 1,10-phenanthroline (phen) to the synthesis of I was found to led to the sequential crystallization of two products, namely, the 1D-polymeric compound [Mn^II(Phen)Cl₂]_n (II) and the mononuclear complex [Mn^II(phen)₂Cl₂] HPyrtrz (II). Complex III was found to be isolated as a single product in the reaction of compound I with phen or in the reaction of the known complex [Mn^II(Phen)₂Cl₂] with HPyrtrz, respectively. The crystal structures of compounds I-III were determined by single-crystal X-ray diffraction (CIF files CCDC № 2339139 (I), № 2344064 (II), № 2339140 (III)). For I and III, antimicrobial activity was studied against E. coli and S. aureus bacterial strains and Penicillium italicum Wehmer mold. According to the temperature dependence of magnetic susceptibility, antiferromagnetic exchange interactions between Mn²⁺ ions (J = –2.69 cm^–1) are realized in compound I. Spectral-luminescent studies showed that HPyrtrz, I and III exhibit blue luminescence in the solid phase.