Generation of a Hetero Spin Complex from Iron(II) Iodide with Redox Active Acenaphthene-1,2-Diimine

The reaction of the redox active 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene (dpp-BIAN) and iron(II) iodide in acetonitrile led to a new complex [(dpp-BIAN)Fe^III₂] (1). Molecular structure of 1 was determined by the single crystal X-ray diffraction analysis. The spin state of the iron cation in complex 1 at room temperature and the magnetic behavior of 1 in the temperature range of 2–300 K were studied using Mossbauer spectroscopy and magnetic susceptibility measurements, respectively. The neutral character of dpp-BIAN in 1 was confirmed by IR and UV spectroscopy. The electrochemistry of 1 was studied in solution and solid state using cyclic voltammetry. The generation of the radical anion form of the dpp-BIAN ligand upon reduction of 1 in a CH₂Cl₂ solution was monitored by EPR spectroscopy.     

Synthesis and Structure of New Polymeric Lithium Pivalates

Russian Journal of Coordination Chemistry - Data on the synthesis and study of the crystal structure of [Li10(Piv)10(MeCN)2]n (I) and [Li6(Piv)6(MeCN)2]n (II) are presented. According to X-ray...     

Addition of phenylacetylene and camphor to the complex [(dpp-bian)Eu(dme)<Subscript>2</Subscript>] (dpp-bian is the 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene dianion)

The reduction of 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene (dpp-bian) with an excess of europium metal in 1,2-dimethoxyethane (dme) produces a divalent europium complex with the dpp-bian dianion, [(dpp-bian)Eu(dme)₂] (1). The reactions of 1 with phenyl-acetylene and camphor proceed via protonation of the diimine ligand to form the monomeric amido-amino complexes of divalent europium — [H(dpp-bian)Eu(C≡CPh)(dme)₂] (2) and [H(dpp-bian)Eu(camphor)(dme)₂] (3), respectively. Compounds 2 and 3 were characterized by IR spectroscopy and elemental analysis. Their molecular structures were determined by X-ray diffraction. Compounds 2 and 3 were shown to be monomeric seven-coordinate europium(ii) complexes with terminal phenylethynyl and enol ligands, respectively. According to the IR spectroscopic data, the terminal ligands in complexes 2 and 3 undergo tautomerization involving backward proton transfer from the amido-amino ligand to the substrate. The magnetic moment of compound 2 (8.03 μB) remains constant in the temperature range of 4—300 К and confirms the presence of divalent europium.     

α-Diimine Cisplatin Derivatives: Synthesis,Structure, Cyclic Voltammetry and Cytotoxicity

Three new Pt(II) complexes [(dpp-DAD)PtCl₂] (I), [(Mes-DAD(Me)₂)PtCl₂] (II) and [(dpp-DAD(Me)₂)PtCl₂] (III) were synthesized by the direct reaction of [(CH₃CN)₂PtCl₂] and corresponding redox-active 1,4-diaza-1,3-butadienes (DAD). The compounds were isolated in a single crystal form and their molecular structures were determined by X-ray diffraction. The purity of the complexes and their stability in solution was confirmed by NMR analysis. The Pt(II) ions in all compounds are in a square planar environment. The electrochemical reduction of complexes I–III proceeds in two successive cathodic stages. The first quasi-reversible reduction leads to the relatively stable monoanionic complexes; the second cathodic stage is irreversible. The coordination of 1,4-diaza-1,3-butadienes ligands with PtCl₂ increases the reduction potential and the electron acceptor ability of the DAD ligands. The synthesized compounds were tested in relation to an adenocarcinoma of the ovary (SKOV3).     

Mononuclear Cu(II), Zn(II), and Co(II) Complexes with 2-Furoate Anions and 2,2'-Bpy: Synthesis,Structure, and Biological Activity

Russian Journal of Coordination Chemistry - The mononuclear complexes [M(Fur)2(Bpy)(H2O)] (M = Cu (I), Zn (II)) were prepared by the reactions of copper(II) and zinc(II) acetates with 2-furoic acid...     

Unexpected Participation of the Carbonate Anion in the Assembly of Hexanuclear Cadmium(II) Trimethylacetate Complex

Russian Journal of Coordination Chemistry - A new unusual molecular complex [Cd6(CO3)(Piv)10(Phen)2] (I) was prepared by the reaction of cadmium(II) trimethylacetate, Cd(Piv)2 · 2H2O, and...     

Synthesis,structure, and magnetic properties of the iron(iii) iodide complex with the 3,5-di-tert-butylcatecholate ligand

Russian Chemical Bulletin - The reaction of iron(ii) iodide with 3,5-di-tert-butyl-o-benzoquinone (3,5-DBBQ) in anhydrous diethyl ether afforded the heteroleptic binuclear complex...     

Molecular Structure and Photoluminescence Behavior of the Zn(II) Carboxylate Complex with Pyrazino[2,3-f][1,10]phenanthroline

Russian Journal of Coordination Chemistry - A new complex [Zn(Piv)2(Pyzphen)] (I) was prepared by the reaction of pyrazino[2,3-f][1,10]phenanthroline (Pyzphen) with Zn(II) pivalate [Zn(Piv)2]n. An...     

Copper(II) Trimethylacetate Complex with Caffeine: Synthesis,Structure, and Biological Activity

Russian Journal of Coordination Chemistry - The reaction of copper(II) trimethylacetate, [Cu(Piv)2]n (Piv = C(Me)3COO–), with caffeine (L)&nbsp;(Cu : L = 1 : 1) in anhydrous acetonitrile...     

Europium and Ytterbium Complexes with the Redox Active Acenaphthene-1,2-Diimine Ligand

The oxidation of [(Dpp-Bian)Eu(Dme)₂] (I) (Dpp-Bian is the 1,2-bis[(2,6-diisopropylphenyl) imino]acenaphthene dianion, Dme = 1,2-dimethoxyethane), prepared in situ, with 0.5 mol equiv. of iodine in Thf gives europium(II) dimer, [(Dpp-Bian)Eu(μ-I)(Thf)₂]₂ (II) (Thf = tetrahydrofuran), with the Dpp-Bian ligand as radical anion. The exchange reaction of II with potassium dithiocarbamate affords europium( II) dimer, [(Dpp-Bian)Eu[SC(S)NMe₂](Thf)]₂ (III), which also contains the Dpp-Bian radical anion. However, the oxidation of the ytterbium complex [(Dpp-Bian)Yb(Dme)₂] (IV) with 0.5 mol equiv. of [Me₂NC(S)S]₂ gives the monomeric product [(Dpp-Bian)Yb[SC(S)NMe₂](Dme)] (V), in which Dpp-Bian is still the dianion and the ytterbium atom is oxidized to the trivalent state. The reaction of II with potassium thiocyanate gives europium(II) isothiocyanate complex with the radical anion diimine ligand [(Dpp-Bian)Eu(NCS)(Dme)₂] (VI). The molecular structures of complexes II, III, V, and VI were determined by X-ray diffraction (CIF files CCDC 1576687–1576690, respectively).