Open Access
Access granted
Subscription Access
Vol 43, No 1 (2017)
- Year: 2017
- Articles: 9
- URL: https://journals.rcsi.science/1070-3284/issue/view/13306
Article
Peculiarities of magnetic exchange in bi- and tetranuclear copper(II) complexes with organic ligands based on 1,3-diaminopropan-2-ol
Abstract
The main types of mechanisms of exchange interactions are considered in the review in the framework of experimental and theoretical analyses. The electronic and geometric factors that exert a determining effect on the magnetic properties of the bi- and tetranuclear complexes of transition metals based on hydrazones and azomethines of 1,3-diaminopropan-2-ol are revealed.
1-20
Cobalt(II) complexes with pentadentate Schiff bases 2,6-diacetylpyridine hydrazones: Syntheses and structures
Abstract
Seven new cobalt(II) complexes based on the Schiff bases, 2,6-diacetylpyridine bis(isonicotinoylhydrazone) (H2L1) and 2,6-diacetylpyridine bis(nicotinoylhydrazone) (H2L2), are synthesized and studied by X-ray diffraction analysis: [Co(H2L1)(NCS)2] · 2.25H2O (I), [Co(H2L2)(NCS)2] · CH3OH (II), [Co(H2L2)(NCS)(H2O)]NCS (III), [Co(H4L1)(NCS)2](NO3)2 · 2H2O (IV), [Co(H4L1)(NCS)2][Co(NCS)4] · 0.75H2O (V), [Co(H4L2)(NCS)2][Co(NCS)4] · 1.75H2O (VI), and [Co(H2L2)(NCS)(CH3OH)]2[Co(NCS)4] · 2CH3OH (VII) (CIF files CCDC 941186 (I), 1457906 (Ia), 1457905 (II), 941187 (III), 1457907 (IV), 1457908 (V), 1457909 (VI), and 941188 (VII)). The organic ligands in the complexes act as pentadentate neutral H2L or doubly protonated (H4L)2+ coordinated through the same set of donor atoms N3O2. In all compounds I–VII, the coordination polyhedron of the Co2+ ion in a complex with the Schiff bases has a shape of a pentagonal bipyramid. The hydrazones are arranged in the equatorial plane of the bipyramid. Its axial vertices are occupied by the nitrogen atoms of the NCS‾ anions in compounds I, II, and IV–VI and by the nitrogen atoms of NCS‾ and oxygen of the water molecule in compound III or methanol in compound VII. The NO3- anions or [Co(NCS)4]2‾ complex anions obtained by the reactions are involved along with the NCS‾ anions in the formation of compounds IV–VII.
21-36
New copper(II) coordination compounds with 1,3-bis(5-(pyridin-2-yl)-1,2,4-triazol-3-yl)propane
Abstract
Two new copper(II) complexes with 1,3-bis(5-(pyridin-2-yl)-1,2,4-triazol-3-yl)propane (H2L), [Cu2(HL)Cl3] · H2O (I) and [Cu(H2L)](ClO4)2 (II), were described. The compounds were characterized by elemental analysis, IR spectroscopy, and magnetochemical data. According to X-ray diffraction data (CIF files CCDC nos. 1497511 (I), 1497512 (II)), complex I is binuclear and the metal cations are bound by the nitrogen atoms of the triazole ring and by the chloride anion. Complex II is mononuclear. Analysis of the temperature dependence of the magnetic susceptibility of I attests to the antiferromagnetic coupling of paramagnetic centers (–2J = 18 cm–1). Exchange channels are analyzed by means of density functional theory (B3LYP/6-311G(d)) using the broken symmetry approach.
37-43
CpFe(CO)2TePh as a ligand for organometallic dihalides Fe(CO)4I2, (p-Cymene)RuI2, and Me5C5RhI2: Synthesis and molecular structures
Abstract
CpFe(CO)2TePh (I) can substitute one carbonyl group in Fe(CO)4I2 providing Fe(CO)3I2(μ-TePh)Fe(CO)2Cp (II) or play role of ligand to monomeric fragments [(p-Cymene)RuI2] and [Сp*RhI2] (p-Cymene = (η6-1-isopropyl-4-methylbenzene); Сp* = η5-pentamethylcyclopentadienyl) provides the complexes (p-Cymene)RuI2(μ-TePh)Fe(CO)2Cp (III) and Cp*RhCl2(μ-TePh)Fe(CO)2Cp (IV), respectively. The single-crystal X-ray diffraction of complexes II–IV (CIF files CCDC nos. 1038124 (II), 1038127 (III), 1038125 (IV)) revealed the shortening of М–Те bonds and the presence of intramolecular I…Te contacts.
44-49
Synthesis, luminescent sensing based on a three-fold interpenetrating network with flexible carboxylates
Abstract
A Zn-based complexes with chemical formulae {[Zn(L)0.5(4,4'-Bipy)] · 2H2O} (I) (H4L = 5,5'-(1,4-phenylene-bis(methylene))bis(oxy) diisophthalic acid), has been synthesized and structurally characterized. Single-crystal X-ray crystallography (CIF file CCDC no. 1465538) reveals that compound I shows a three-dimensional three-fold interpenetrating network simplified by a bbf topology (vertex symbol (66)2(64.82)). Complex I can work as highly sensitive sensors to Cu2+, CrO42- and explosive by luminescent quenching.
50-54
Thermal stabilities and crystal structures of two supramolecular microporous frameworks based on carboxylate-dipyridyl mix-ligands
Abstract
The mix-ligand system of 5-(4-carboxy-2-nitrophenoxy)isophthalic acid (HСn-H2Ipa) and dipyridyl-type molecule produces two M(II) porous coordination polymers, namely {[Zn(HCn-Ipa)(Dpe)(H2O)] · 2H2O}n (I) and {[Co(Cn-HIpa)(Dpe)(H2O)3] · 2.5H2O}n (II) (Dpe = 1,2-di(4-pyridyl) ethylene). Structure determinations reveal that two complexes feature different one-dimensional (1D) polymers assembling into supramolecular microporous frameworks with different thermal stabilities. The 3D supramolecular frameworks of complex I show relatively lower stability, which can be caused by relatively larger porous cavity absent of the strong hydrogen bonds interaction, whereas thick-layer blocks in complex II are cohered further together by H-bonding interactions to form its 3D supramolecular network with relatively higher stability, indicating extraordinarily stable H-bonding systems; CIF files CCDC nos. 966919 (I) and 966920 (II).
55-62
Synthesis, crystal structures, and properties of copper(II) dicarboxylate complexes with [bis(2-pyridylcarbonyl)amido]
Abstract
Four new complexes, [Cu2(Bpca)2(L1)(H2O)2] · 3H2O (I), [Cu2(Bpca)2(L2)(H2O)2] (II), [Cu2(Bpca)2(L3)] · 2H2O (III), [Cu2(Bpca)2(L1)(H2O)] · 2H2O (IV) (Bpca = bis(2-pyridylcarbonyl)amido, H2L1 = glutaric acid, H2L2 = adipic acid, H2L3 = suberic acid, H2L4 = azelaic acid) have been synthesized and characterized by single-crystal X-ray diffraction methods (CIF files CCDC nos. 1432836 (I), 1432835 (II), 817411 (III), and 817412 (IV)), elemental analyses, IR spectra. Structural analyses reveal that compounds I, II, and IV have similar structures [Cu(Bpca)]+ units bridged by dicarboxylate forming dinuclear units, whereas the dinuclear of compound III are edge-shared through two carboxylate oxygen atoms of different suberate anions. Hydrogen bonds are response for the supramolecular assembly of compounds I to IV. The temperature-dependent magnetic property of III was also investigated in the temperature range of 2 to 300 K, and the magnetic behaviour suggests weak antiferromagnetic coupling exchange.
63-72
Erratum
Erratum to: “The formation of heterometallic molecular architectures with 3d-metal atoms linked by carboxylate bridges with alkali and alkaline-earth metal ions or with lanthanides”
73-73
Erratum to: “Trifluoroacetate complexes of 3d elements: Specific features of syntheses and structures”
74-74