746. Magnetic studies with copper(<scp>II</scp>) salts. Part I. Anomalous paramagnetism and δ-bonding in anhydrous and hydrated copper(<scp>II</scp>) acetates

Figgis, B. N.; Martin, R. L.

doi:10.1039/jr9560003837

Cited by 285 publications

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“…The magnetic moment of copper in copper(I1) acetate is known to decrease as the temperature is lowered (1,2). This anonlalous effect has been explained by assuming that the copper ions are arranged in isolated pairs which interact strongly through exchange forces (3).…”

Section: R F Grantmentioning

confidence: 99%

Proton Magnetic Resonance Absorption in Copper(ii) Stearate

Grant¹

1964

Can. J. Chem.

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The magnetic moment of copper in copper(I1) acetate is known to decrease as the temperature is lowered (1, 2). This anonlalous effect has been explained by assuming that the copper ions are arranged in isolated pairs which interact strongly through exchange forces (3). X-Ray studies, supporting this explanation, have shown that copper(I1) acetate monohydrate exists as a binuclear molecule Cu2(CH3C02) 4.2H20 in which the copper ions are situated close together (4). By analogy, a similar structure has been suggested for copper(I1) salts of higher fatty acids (5, 6), although a layer structure allowing a kind of antiferromagnetic interaction between the copper ions has also been proposed (7). This layer structure, which is supposedly characteristic of fatty acid salts (81, infers a cooperative effect between copper ions extending in planes throughout the crystal lattice. In such a structure, the interaction between the copper ions should decrease if the lattice expands with rising temperature and some correlation between motion of the hydrocarbon portion of the molecule and the magnetic moment might be expected. The following investigation of proton magnetic resonance absorption in copper(I1) stearate shows no such correlation. E X P E R I M E N T A LThe stearic acid used was Eastman Kodak white label grade, purified by repeated crystallization a t -20' C in acetone. Copper(I1) stearate was prepared by metathesis of potassium stearate it1 70% ethanol with a n aqueous solution of copper(I1) sulphate a t 60' C. The soap precipitate was allowed to settle overnight and was then washed repeatedly on a suction filter with distilled water and with aqueous ethanol. The product was dried in an air oven a t 100' C and then heated to about 130" C under vacuum to render it more compact. Portions of this soap used in the proton magnetic resonance investigations were reheated under vacuum in sample tubes, dry nitrogen was admitted t o the system, and the tubes were sealed off.Copper(I1) stearate has been reported t o melt indefinitely to a clear blue liquid a t 125' C (9). This was not observed, either for the samples which had been heated under vacuum or for new samples dried in air. On a Fisher-Johns melting blocl:, some sample particles were observed to deform slightly around 120" C,

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Section: R F Grantmentioning

confidence: 99%

Proton Magnetic Resonance Absorption in Copper(ii) Stearate

Grant¹

1964

Can. J. Chem.

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“…The Cu-Cu distance is about 2.62 oA, which is a little larger than that in the Cu metal (2.56 A). There is some controversy on the bonding character (&bond (5) or cr-bond (6)) between the Cu unpaired 3d electrons, and no direct bond between two Cu's (1,2).…”

Section: Introductionmentioning

confidence: 99%

Electronic structure of lower singlet states of binuclear copper acetate monohydrate

Ogasawara¹,

Mochizuki²,

Noro³

et al. 1992

Can. J. Chem.

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This pciper is dedicated to Professor Sigeru Hllzitzaga on the occclsion of his 65th birthdciy KATSUYUKI OGASAWARA, YUJI MOCHIZUKI, TAKESHI NORO, and KIYOSHI TANAKA. Can. J. Chem. 70, 393 (1992). The electronic structures of the ground state and the excited states due to the 3d-3d transition of copper acetate 3d electron to an unoccupied 3d orbital in either of the two Cu's are located around 1.6-1.8 eV, which corresponds to the energy region of band I. Those of the simultaneous one-electron 3d-3cl excitation in both Cu's (i.e., two-electron excitation) are located around 3.2-3.4 eV. They correspond to the energy region of band 11.

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“…The last one has been reported as a characteristic band to the acetates with bridge coordination type [16][17][18][19] . The magnetic moments for the compounds I and II 1.82 and 1.65.M.B respectively are higher than that 1.4 M.B reported for coper(II) acetate monohydrate 20 . In neutral medium the orotic acid coordinates through an oxygen coming from C=O group loosing two water-molecules.…”

Section: Resultsmentioning

confidence: 50%

Study of the Interactions Between Copper(ii) Acetate Monohydrate and Orotic Acid and Orotate Ligands

Seguel¹,

Rivas²,

Paredes³

2010

J. Chil. Chem. Soc.

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Different complexes by reacting copper(II) acetate monohydrate with orotic acid and orotate as ligands were prepared. These compounds were characterized by elemental analysis, spectroscopy, and thermal analysis. It is suggested that in both compounds, the Cu 2 (acetate) 4 suffers the break of both acetate groups by a substitution of orotic or orotate ligands, increasing the Cu-Cu distance. It was corroborated by the magnetic moment values of 1.65 and 1.82 B.M for these compounds.The anion orotato(-1) coordinates through the carboxylic acid and the orotic acid by the oxygen from exocyclic C=O. Semiempirical PM3 calculations for both compounds were also carried out.

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746. Magnetic studies with copper(II) salts. Part I. Anomalous paramagnetism and δ-bonding in anhydrous and hydrated copper(II) acetates

Abstract: Figgis and Martin. 3837 746. Magnetic Xtudies with Copper(I1) Xults. Part I . Anomalous Pasramagnetism and 6-Bonding in Anhydrous and Hydrated Copper( 11) Acetates.

Cited by 285 publications

References 0 publications

Proton Magnetic Resonance Absorption in Copper(ii) Stearate

Proton Magnetic Resonance Absorption in Copper(ii) Stearate

Electronic structure of lower singlet states of binuclear copper acetate monohydrate

Study of the Interactions Between Copper(ii) Acetate Monohydrate and Orotic Acid and Orotate Ligands

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