Structure of copper-dimethylglyoxime at low temperature

Frasson, E.; Bardi, R.; Bezzi, S.

doi:10.1107/s0365110x59000573

Cited by 115 publications

(34 citation statements)

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“…Similar copper contacts in the region of the sixth octahedral position had been reported for copper dimethylglyoxime (Frasson, Bardi & Bezzi, 1959; a carbon atom at 3.76A), N,N'-disalicylidene-propane-l,2diaminecopper monohydrate (Llewellyn & Waters, 1960; an oxygen atom at 3-81 A) and N,N'-disalicylidene-ethylenediaminecopper (Hall & Waters, 1960; a carbon atom at 3.84 A), but the importance of this fact does not seem to have been noticed. *…”

Section: Calculationssupporting

confidence: 79%

Structural studies of metal dithiocarbamates. II. The crystal and molecular structure of copper diethyldithiocarbamate

Bonamico¹,

Dessy²,

Mugnoli³

et al. 1965

Acta Cryst

231

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Section: Calculationssupporting

confidence: 79%

Structural studies of metal dithiocarbamates. II. The crystal and molecular structure of copper diethyldithiocarbamate

Bonamico¹,

Dessy²,

Mugnoli³

et al. 1965

Acta Cryst

231

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“…It is seen that each copper atom lies slightly out of the basal plane in the direction of the fifth ligand. This trend is similar to that found in other structures containing copper(II) atoms with tetragonal pyrimidal arrangement of ligands (Frasson, Bardi & Bezzi, 1959;Barclay & Kennard, 1961a;Freeman et al, 1964). The oxygen atom 0(2) is twisted out from the plane of the binuclear ion in such a way that a close approach to the copper atom Cu(l') is attained.…”

Section: Di-/a-hydroxobis(dimethylaminecopper(ii)) Sulfate Monohydratesupporting

confidence: 70%

The crystal structure of di-μ-hydroxo-bis(dimethylaminecopper(II)) sulfate monohydrate

Iitaka¹,

Shimizu²,

Kwan³

1966

Acta Crystallogr

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The crystal structure of di-a-hydroxobis(dimethylaminecopper (II)) sulfate monohydrate, CUE(NHzCH3)4(OH)2SO4. H20, has been determined by X-ray analysis. The crystals are triclinic with space group Pi and the cell dimensions are, a=9"28a, b=ll.31~, c=7"425/~, e=98"6s, p=92"94, ~= 113.19 °, with two formula units in the cell. The final parameters were evaluated by a full-matrix least-squares treatment of three-dimensional data.The structure contains two crystaUographically independent copper(II) atoms having a tetragonal pyramidal coordination. Each copper atom is coordinated by two hydroxyl anions and two nitrogen atoms of methylamine to form a binuclear complex ion. The two hydroxyl ions are shared by the two copper atoms. The complex ion is puckered at the hydroxyl ions and this results in a rather close approach, 2.78 ~, between the copper atoms. Two such complex ions are bound together to form a dimer, in which the hydroxyl ion in one of the complex ions is coordinated as a fifth ligand to the copper atom in the other. A water molecule is coordinated to another copper atom of the complex ion as a fifth ligand. The dimers are piled up along the c axis, and sulfate ions are attached to them through hydrogen bonds. These lcolumnar units of the structure are packed together parallel to the c axis to complete the structure. ExperimentalIn the course of a study of the hydrogenation catalysis by cupric salts dissolved in organic bases, a new compound with the composition Cuz(NH2CH3)4(OH)2SO4 • H20 was found to deposit in reaction flasks. In view of the significance of the structural correlation of this complex with the substrate, a structural analysis was undertaken on it by X-ray diffraction.The complex was prepared by dissolving CuSO4. 5H20 in a 40% aqueous solution of methylamine in a water bath with a molar ratio of copper to methylamine 1:4. After filtration of the dark blue solution obtained, a small amount of alcohol was added to it. The solution was then suddenly cooled to liquid nitrogen temperature in order to stimulate crystallization. Many * Present address: The Government Chemical Industrial Research Institute, Tokyo, Shibuya-ku, Tokyo, Japan. small crystals were obtained as a precipitate when the solution was kept in a refrigerator for a while. The crystal suitable for the X-ray work was grown from the solution at room temperature by using a crystal from the precipitate as a seed crystal.The crystals collected were dark blue, elongated along the c axis, and often twinned with the twinning axis c. The crystals were unstable and easily decomposed on exposure to the air. During the exposure to X-rays, the specimen was kept in a thin-walled Pyrex glass capillary filled with methylamine and ethyl alcohol vapours. Although the results of chemical analysis showed poor reproducibility because of such instability of the specimen, the molar proportions of copper, methylamine, sulfate and water were found to be approximately 2:4: 1:3, where the water content was determined by Karl Fischer's method. In the course...

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“…Simandi et al [37][38][39] have studied iron(II) and cobalt(II) oxime catalysed oxidative dehydrogenation of catechols with dioxygen, but no applications of copper are reported. Most publications concerning Cu-dmg complexes merely describe the structure of the complex and its redox properties [40][41][42][43][44][45].…”

Section: Primary Screeningmentioning

confidence: 99%

An efficient method to investigate metal?ligand combinations for oxygen bleaching

Korpi

Lahtinen

Sippola³

et al. 2004

Applied Catalysis A: General

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Structure of copper-dimethylglyoxime at low temperature

Cited by 115 publications

References 0 publications

Structural studies of metal dithiocarbamates. II. The crystal and molecular structure of copper diethyldithiocarbamate

Structural studies of metal dithiocarbamates. II. The crystal and molecular structure of copper diethyldithiocarbamate

The crystal structure of di-μ-hydroxo-bis(dimethylaminecopper(II)) sulfate monohydrate

An efficient method to investigate metal?ligand combinations for oxygen bleaching

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