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Vol 49, No 7 (2023)
Articles
Coordination Polymers of Lithium Based on 1,2-Bis[(2,6-diisopropyl-4-diethylmalonophenyl)imino]acenaphthene
Abstract
1,2-Bis[(2,6-diisopropyl-4-diethylmalonophenyl)imino]acenaphthene (Dem-Bian) with zinc chloride forms complex [(Dem-Bian)ZnCl2] (I). The reaction of complex I with n-BuLi proceeds with the deprotonation of the malonate fragments and gives 1D coordination polymer [ZnCl2(Dem-Bian)Li(DME)2]n (II). The reaction of [(Dem-Bian)CuCl] with n-BuLi affords 1D polymer [(Dem-Bian)Li2(DME)2]n (III). Compounds I–III are characterized by elemental analysis and IR spectroscopy. Derivatives I and II are characterized by 1Н NMR spectroscopy. The crystal structures of compounds II and III are determined by X-ray diffraction (XRD). Their thermal stability is studied by thermogravimetric analysis.
387-397
Heteroleptic Cobalt Complexes with Abnormally Coordinated N-Heterocyclic Carbene
Abstract
The reaction of cobalt pivalate [Co(Piv)2]n and in situ generated N‑heterocyclic carbene IPrPh (1,3-bis(2,6-diisopropylphenyl)-2-phenylimidazol-4-ylidene) affords heteroligand complexes [Co2(Piv)4-(IPrPh)2] (I), [Co2(Piv)2.8(OtBu)1.2(IPrPh)2] (II), and [Co3(μ3-O)(Piv)4(IPrPh)2] (III). The structures of complexes II·C6H14 and III are determined by X-ray diffraction (XRD) (CIF files CCDC nos. 2216724 and 2216725, respectively). Exchange spin-spin interactions between the magnetic Со2+ ions in the synthesized compounds are estimated by quantum chemical calculations.
398-405
Heteroligand Zn(II) Metal-Organic Frameworks Based on 4-Substituted 4,2':6',4"-Terpyridine Derivatives and Terephthalates
Abstract
Metal-organic frameworks based on Zn(II) and 4-substiuted 4,2':6',4"-terpyridine, terephthalate (Bdc), and 2-iodoterephthalate (2-I-Bdc) derivatives, {[Zn3(FurTerPy)2(Bdc)6]} (I), {[Zn(FurTerPy)(2-I-Bdc)}] (II), and {[Zn(PyrrTerPy)2(Bdc)} (III), were prepared and characterized by X-ray diffraction.
406-411
Heteroleptic Zinc Catecholate Complexes with N-Donor Ligands
Abstract
New heteroleptic zinc catecholate complexes based on 3,6-di-tert-butyl-o-benzoquinone and containing metal-coordinated N-donor ligands (2,2'-bipyridine and phenanthroline) were prepared by ligand exchange. According to X-ray diffraction data, both complexes were dimers with multiple intermolecular π–π interactions between the aromatic moieties of neighboring molecules (CCDC nos. 2222704 (I), 2222705 (II)). The electronic transmission spectra of crystalline samples of I and II and their solutions show broad absorption bands in the visible region with a maximum at about 500 nm.
412-421
Copper(II) o-Iminophenolate Complexes Based on Catecholaldimines
Abstract
The exchange reactions of 4,6-di-tert-butylpyrocatechols containing in position 3 different N‑aryliminomethyl groups (aryl is p-halophenyl; halogen is fluorine (I), chlorine (II), bromine (III), and iodine (IV); p-tolyl (V)) with copper(II) acetate in a molar ratio of 2 : 1 afford planar square copper(II) o‑iminophenolate complexes of the general formula [(R-CatH)2Cu], where R is the aryl substituent in the Ar–N=CH group. The molecular structures of complexes I, III, and V in the crystalline state are determined by X-ray diffraction (XRD) (CIF files CCDC nos. 2227448 (I), 2226727 (III), and 2227449 (V)). The electrochemical properties of compounds I–V are studied by cyclic voltammetry.
422-430
Crystal Structure of Magnesium Comenate
Abstract
The coordination compound [Mg(HCom)2(H2O)6]·2H2O (I) was obtained by the reaction of comenic acid (H2Com) with magnesium acetate in water. The formation of a new phase was confirmed by powder X-ray diffraction. The molecular formula of the compound was determined from energy dispersive X-ray fluorescence and thermogravimetry data. The thermo-oxidative stability of magnesium comenate was studied by simultaneous thermal analysis in air. The molecular structure of the complex was discussed on the basis of spectral data (NMR, IR, and UV spectroscopy) and studied in detail using X-ray diffraction (CCDC no. 2 207 835). Magnesium comenate crystallizes in the triclinic system, space group P1¯,
the structure is stabilized by intra- and intermolecular hydrogen bonds between the coordinated water molecules, acid anions, and [Mg(H2O)6]2+.
431-440
Second Example of a Cubane-Like Nickel(II) Complex in a Series of N-Derivatives of Taurine
Abstract
A new homometallic cubane-like nickel(II) complex based on N-2-(2-pyridyl)ethyl-2-aminoethanesulfonic acid [Ni4L4(OH)4]·2H2O (I) is synthesized, and its structure is studied by X-ray diffraction (XRD) (CIF file CCDC no. 2211359). In crystals of the complex, the metallocenters are joined into tetrahedra with the Ni…Ni distances (3.144–3.201 Å) supplemented to cubanes by the μ3-bridging oxygen atoms of the hydroxy groups. The coordination environment of each metallocenter is a distorted octahedron. The ligand is deprotonated, exists in the facial conformation, and performs the tridentate function to form two six-membered conjugated chelate cycles.
441-448