Synthesis,crystal structure,and magnetic properties of a new end-to-end thiocyanato-bridged dicobalt(II) complex CoII(dien)(H2O)(NCS)(μ1,3-NCS)CoII(dien)(NCS)2 (dien = diethylenetriamine)

Synthesis, characterization, crystal structure, and magnetic properties of the first single µ_1,3-thiocyanato-bridged dicobalt(II) compound, [Co^II(dien)(H₂O)(NCS)(µ_1,3-NCS)Co^II(dien)(NCS)₂] (1; dien = diethylenetriamine), are described. In 1, cobalt(II) is six coordinate with distorted-octahedral geometry. The Co(1) ··· Co(2) distance is 5.99 Å. The magnetic properties of 1 have been investigated by variable-temperature magnetic susceptibility measurements. The metal centers are coupled by weak ferromagnetic interaction (J = 1.14 cm^?1). The structure and magnetic properties are compared with related thiocyanate-bridged compounds.     

A cyanide-containing cobalt(III) complex [Co(phen)2(CN)2][Co(phen)(CN)4]·4.5H2O: hydrothermal synthesis,crystal structure and spectroscopic properties

A cyanide-containing cobalt(III) complex, [Co(phen)₂(CN)₂][Co(phen)(CN)₄]?·?4.5H₂O (1: phen?=?1,10-phenanthroline) has been synthesized by hydrothermal techniques and characterized by elemental analyses, IR spectroscopy, UV–vis spectroscopy and single-crystal X-ray diffraction methods. The complex is triclinic, space group P 1 , with a?=?11.0047(16), b?=?12.9587(19), c?=?15.076(2)?Å, α?=?100.060(2), β?=?102.061(2), γ?=?91.803(2)°, V?=?2065.0(5)?ų, Z?=?2, and R ₁ [I?>?2σ(I)]?=?0.0481. The molecular unit of 1 consists of a cation/anion pair with interstitial water molecules in the crystal lattice. The combination of coordinative, hydrogen bonding and π–π stacking interactions results in the stabilization of a supramolecular solid-state architecture.     

Synthesis,crystal structure and magnetic properties of a 1D coordination polymer[Ni(phth)(phen)(H2O)] n · n H2O

A new one-dimensional coordination polymer [Ni(phth)(phen)(H₂O)] _n ?·?nH₂O was synthesized. The structure was determined by X-ray crystallography revealing that each nickel atom is five-coordinate bridged via phthalate ion to form a zigzag chain. The chains are further linked together via hydrogen-bonding interactions to construct a three dimensional supramolecular network. The magnetic properties of the complex show that there are weak antiferromagnetic interactions between Ni(II) centers.     

Synthesis, crystal structure and magnetic properties of bimetallic complex of Ni2Co(TTHA)·12H2O

The bimetallic complex of Ni₂Co(TTHA)·12H₂O (TTHA = triethylene tetraminehexaacetic acid) was synthesized and characterized structurally and magnetically. The title complex crystallizes in the triclinic space group P ī with a = 0.7316(2), b = 0.8624(2), c = 1.5041(4) nm; α = 73.38(2), β = 83.97(2), γ = 70.50(2)°. The crystal structure is built up of [Ni₂(TTHA)(H₂O)₂]²⁻, Co(H₂O)₆²⁺ and water molecules. The variable magnetic measurement shows that there is strong antiferromagnetic interaction between two Ni(II) ions in [Ni₂(TTHA) (H₂O)₂]²⁻ with J _Ni−Ni = −141.64 cm⁻¹, g _Ni = 2.21 and that the constant of spin-orbit coupling of Co(II) ion is −134.8 cm⁻¹. __________ Translated from Acta Scientiarum Naturalium Universitatis Nankaiensis, 2007, 40(1): 6–10 [译自: 南开大学学报(自然科学版)]     

Synthesis,crystal structures and magnetic properties of a series of new cyano-bridged complexes derived from templates [Ni(CN)4]2− and [Co(III)(CN)6]3−

Three new cyano-bridged complexes 1 [Ni(tn)₂Ni(CN)₄] (tn?=?1,3-diaminopropane), 2 [Cu^II(dipn)Ni^II(CN)₄], and 3 [Cu(dipn)]₆[Co(CN)₆]₄?·?4H₂O (dipn?=?dipropylenetriamine) have been assembled by the templates [Ni(CN)₄]^2? and [Co(CN)₆]^3?. 1 consists of a one-dimensional linear chain–Ni(tn)₂–NC–Ni(CN)₂–CN–Ni(tn)_2? in which the Ni(II) centers are linked by two CN groups. One 1-D zigzag chain of 2 is formed with–Ni(2)–C–N–Cu(1)–N–C–linkages. A 2D structure of 3 is formed by an alternate array of [Co(CN)₆]^3? and [Co][Cu₆] units. For 1, there is an overall weak antiferromagnetic interaction between Ni(II) ions through the–NC–Ni–CN–bridges of the diamagnetic [Ni(CN)₄]^2? anions. 2 exhibits a weak antiferromagnetic exchange interaction between copper(II) ions mediated by [Ni(CN)₄]^2? diamagnetic bridges. Complex 3 exhibits a weak ferromagnetic interaction between nearest Cu^II and Cu^II atoms through–NC–Co–CN–bridges.     

Synthesis, crystal structure, and photophysical properties of acid (H3O)2[{W6Br8}Br6] · 4H2O

Compound (H₃O)₂[{W₆Br₈}Br₆] · 4H₂O is synthesized by the reaction of polymeric tungsten bromide W₆Br₁₂ with hydrobromic acid in an ethanolic solution. The structure of the compound is a packing of counterions H₃O⁺ and [{W₆Br₈}Br₆]^2? and crystallization water molecules joined with each other by an extended system of hydrogen bonds. The finely crystalline sample of the complex exhibits luminescence, whose spectrum has a broad profile from ??500 nm to more than 950 nm with a maximum at ??715 nm, with an absolute quantum yield of ??0.225. The emission is characterized by the biexponential decay with lifetimes of ??2.2 and ??8.4 ??s.     

Synthesis,crystal structure,magnetic and spectroscopic properties of {[Cu(oxbe)(py)]2Ni(py)2}·2Dmf complex of dissymmetrical oxamidate

The trinuclear complex {[Cu(oxbe)(py)]₂Ni(py)₂}·2DMF has been prepared and characterized by elemental analysis, IR and electronic spectra and magnetic susceptibility, where H₃oxbe is the dissymmetrical ligand N-benzoato-N′-(2-aminoethyl) oxamido, py?=?pyridine, DMF?=?dimethylformamide. The molecular structure of this complex is centrosymmetrical and has an extended oxamido-bridged structure consisting of two pyramidal copper(II) and one octahedral nickel(II) ions. The central Ni(II) and two terminal Cu(II) ions are antiferromagnetically coupled, J?=???60.2?cm^?1.     

Crystal structure of [{Cu(H2O)(en)2}{Cu(en)2}Re6Te8(CN)6]·3H2O

The reaction of Cs₄[Re₆Te₈(CN)₆]·2H₂O with Cu(en)₂Cl₂ in water affords crystals of a cluster complex [{Cu(H₂O)(en)₂}{Cu(en)₂}Re₆Te₈(CN)₆]·3H₂O. The structure of the compound is determined by single crystal X-ray diffraction (a = 10.8082(4) Å, b = 16.5404(6) Å, c = 24.6480(7) Å, β = 92.696(1)°, V = 4401.5(3) ų, Z = 4, space group P2₁/n, R ₁ = 0.0331, wR ₂ (all data) = 0.0652). In the complex, cluster [Re₆Te₈(CN)₆]^4? anions are linked by Cu²⁺ cations into zigzag chains through cyanide bridges. The coordination environment of the copper cations is complemented by ethylenediamine molecules. Each of the cluster anions is additionally coordinated by a terminal fragment {Cu(H₂O)(en)₂}.     

配位聚合物{[Co(H2O)6][Co(H2O)4(pmts)]·4H2O}n的合成及晶体结构

以均苯四甲酸(pmts)和CoCl2·6H2O为原料,在碱件水溶液中通过水热法合成了配位聚合物{[Co(H2O)6][Co(H2O)4(pmts)]·4H2O}n,并对其进行了红外、紫外-可见吸收光谱和单品X-射线衍射结构测定.结果表明,Co2+分别与桥配体pmts的1,4位羧基氧及端配体水分子中的氧以轻度畸变的八血体...     

New chain polymer [Yb(tpa)(H2O)2Co(CN)6]n · 7n H2O: synthesis,structure, and magnetic characteristics

The 3d– 4f heterometallic polymeric complex, namely [Yb(tpa)(H₂O)₂Co(CN)₆]_n·7n H₂O [tpa = tris(2-pyridylmethyl)- amine], was synthesized and characterized. Its polymer structure is formed of [Yb(tpa)(H₂O)₂Co(CN)₆] chains and crystallization water molecules with a two-capped trigonal prism Yb³⁺ coordination polyhedron; the Yb³⁺ coordination number is 8, and the coordination site is YbN₆O₂. Magnetic characteristics indicate that the complex exhibits the properties of a single-chain magnet with a magnetization reversal barrier(!E/k_B) of 42 K.     

Synthesis and crystal structure of a coordination polymer {[Cu2(L)2(Phen)2] · 8H2O} n

A novel metal coordination polymer, {[Cu₂(L)₂(Phen)₂] · 8H₂O} _n (I), has been synthesized by the reaction of Cu(NO₃)₂ with 2,2′-bipyridyl-4,4′-dicarboxylic acid (L) and 1,10-phenanthroline (Phen) at room temperature. The polymer was characterized by IR, elemental analyses and X-ray diffraction. Single-crystal structural analysis reveals that the center Cu²⁺ ions have two coordinated types. The Cu(1) atom has the five-coordinate mode, and Cu(2) forms an is octahedron of the six-coordinate mode. Two Cu²⁺ ions are connected by the O atom of carboxylate group bridges. Complex I contains eight molecules of water clusters and constructed a 1D tape structure.     

Synthesis,crystal structure and spectroscopic properties of a chiral cyano-bridged heterobinuclear complex, (4 S ,11 S )-[Cu(1,7-CT)( μ -CN)Fe(CN)4NO] · H2O

The chiral complex, (4S,11S)-[Cu(1,7-CT)(μ-CN)Fe(CN)₄NO] ·?H₂O (1,7-CT =?5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-1,7-diene), and its enantiomer have been synthesized by reaction and conglomerate crystallization. They consist of heterobinuclear species in which the Cu and Fe centers are linked by a cyanide bridge and crystalline water. The Cu(II) is coordinated by five N atoms and exhibits a distorted square-pyramidal geometry, in which two hydrogen atoms on secondary amines lie in the inward side of the macrocyclic plane, while on the other moiety the Fe(II) is a slightly distorted octahedral structure. The binuclear molecules are linked through intermolecular O2–H2A···N1 and O2–H2B···N4 hydrogen bonds, forming two different waved chains that oriented the molecules for optical activity. IR spectrum shows the existence of bridging cyanide ligand. In methanol the specific rotations of enantiomers are ±205 deg ·?cm² ·?(10 g)^?1, the peak positions of their circular dichroism spectra are close to that of their UV-Vis spectra and present up and down symmetric signals.     

Crystal structure and magnetic properties of a nitronyl nitroxide complex {[Co2(NIT4Py)4(fum)2(H2O)4] · (H2O)2} n

The title compound {[Co₂(NIT4Py)₄(fum)₂(H₂O)₄] · (H₂O)₂} _n , where NIT4Py = 2-(4′-pyridinyl)-4,4,5,5-tetra-methylimidazoline-1-oxyl-3-oxide and fum = fumarate, was prepared and structurally characterized by X-ray diffraction. It crystallizes in triclinic, space group P 1 with a = 9.8853(9) Å, b = 13.2167(13) Å, c = 13.8481(12) Å, α = 68.5400(10)°, β = 73.467(2)°, γ = 74.596(2)°, V = 1587.6(3) ų, Z = 1, and R ₁ [I > 2σ(I)] = 0.0662. The complex consists of two kinds of neutral infinite 1-D chains, in which [Co(NIT4Py)₂(H₂O)₂] moieties are connected by fumarate anions in a bis-monodentate mode. These 1-D chains are further connected by hydrogen bonds, generating a 2-D network. The variable temperature magnetic susceptibility measurement reveals that the magnetic couplings between Co(II) and NIT4Py are weak antiferromagnetic interactions.     

Crystal structure and magnetic properties of [{Co(H2O)2}2Mo(CN)8]·4 H2O,a three-dimensional cyanide-bridged bimetallic compound

The three-dimensional cyano-bridged bimetallic compound of formula [{Co(H₂O)₂}₂Mo(CN)₈]·4 H₂O is described. The single-crystal X-ray structural determination revealed that the compound has a polymeric structure based on a network of [Mo^IV(CN)₈] units and Co^II ions. Each Mo(CN)₈ building block is linked to Co ions through its eight CN ligands and each Co^II centre is connected to four Mo units forming a highly symmetrical three-dimensional framework with square-shaped channels running through the structure. The magnetic behaviour in the temperature range 2–300 K and spectroscopic data are reported as well. To cite this article: F. Tuna et al., C. R. Chimie 6 (2003).     

Synthesis and crystal structure of a three-dimensional 3d-4f heterometallic supramolecular complex {Eu(DMF)4(H2O)2Cr(CN)6·;H2O} n

A lanthanide-transition heterometallic supramolecular complex {Eu(DMF)₄(H₂O)₂Cr(CN)₆·H₂O} _n (1) has been synthesized based on the reaction of K₃[Cr(CN)₆], N,N-dimethylformamide (DMF) and Eu(NO₃)₃·6H₂O. 1 crystallizes in the monoclinic space group P2(1)/c with a=13.130(6)Å, b=12.923(7)Å, c=19.184(9)Å and Z=4. In 1 each Eu(III) is eight-coordinate with six oxygen atoms from four DMF molecules and two H₂O molecules and two nitrogen atoms from two cis-bridging CN ligands to form a distorted dodecahedron. 1 has a three-dimensional network created by the incorporation of coordinative linkage, three inter-molecular and an intrachain hydrogen bond.     

Synthesis, properties, and thermal decomposition of compounds [Co(En)3][Fe(CN)6] · 2H2O and [Co(En)3]4[Fe(CN)6]3 · 15H2O

Binary complex salts, [Co(En)₃][Fe(CN)6] · 2H₂O and [Co(En)₃]₄[Fe(CN)₆]₃ · 15H₂O, are synthesized. The properties of the salts and their thermolysis in air, dihydrogen, and argon are studied. Oxides of the central ions of the binary complex salts are found to be the thermolysis products in an oxidative atmosphere. Solid solutions (intermetallic compounds) CoFe are the thermolysis products in the reductive atmosphere, whereas intermetallides containing considerable amounts of C and N and an impurity of Co and Fe oxides are the thermolysis products in an inert atmosphere. Gaseous thermolysis products in dihydrogen and argon are NH₃, hydrocarbons, and ethylenediamine.     

Synthesis, crystal structure, and fluorescence properties of a novel coordination polymer [Zn(L)(4,4′-bipyridine)(H2O)] n · (H2O)4

In this work, a novel and rare coordination polymer, [Zn(L)(Bipy)(H₂O)] _n · (H₂O)₄ (H₂L??sphenylpropylmalonate acid, Bipy??4,4??-bipyridine), has been synthesized and characterized by elemental analysis, FT-IR spectroscopy, and solid fluorimetry studies. In the crystal, the Zn²⁺ ion of the complex is hexacoordinated in a slightly distorted octahedral configuration forming the unit structure, 2D structure, and 3D framework. The supramolecular architecture was constructed by a unit of (H₂O)₄ discrete water cluster. Besides, the coordination polymer displays strong emission spectra due to the metal-to-ligand charge-transfer transition, having potential applications as fluorescent materials.