Magnetic Susceptibilities of the Cupric Salts of some α, ω-Dicarboxylic Acids

Abstract

potassium nitrate is observed at 130°. The endotherm at 290°c orresponding to the first crystalline transition of barium perchlorate culminates in the sharp exotherm at 325°caused by the solid state metathesis. All of the potassium nitrate is used up in the reaction and the next break in the curve is a shallow endotherm at 360°c orresponding to the second crystalline transition of the excess barium perchlorate. During the endotherm at 410°, the sample, which now consists of barium nitrate, potassium perchlorate and excess barium perchlorate, melts completely. This endotherm is succeeded immediately by exothermic perchlorate decomposition at 535°. The 410°endothermic fusion and subsequent perchlorate decomposition observed with this sample is similar to that exhibited by potassium perchlorate-barium nitrate mixtures at 465°. This system, however, is inherently more complex since the metathetical reaction occurring in the presence of an excess of one of the reactants results in a ternary system. This in turn may lead to the formation of lower melting eutectics. Nitrate decomposition occurs above 700°. On thermogravimetric analysis the mixture loses an amount of weight equivalent to the decomposition of barium perchlorate to barium chloride at 565°. It undergoes a further loss in weight above 700°due to the decomposition of nitrate ion.

Synthesis and structural studies of tetraaquacopper(II) diaquabis(malonato)cuprate(II)

“…Each -C-C(O)=O group in the complex anion is itself planar; trans C-C(O)=O groups are coplanar with each other. The dihedral angle between the planes defined by 0( 14), C(13), 0(18), C(12) and 0 (12), C( 14), 0 (14), O( 15) is 1.5( 2)"; the angle between the mean planes calculated for the sets of atoms 0 (11), C(16), 0(110), C(15) and 0(13), C (11), 0(17), C( 12) is 2.5(1)".…”

Crystal architecture and magnetic properties of four transition-metal adipate coordination polymers

“…Moreover, a possible interpretation of the magnetic behavior, in correlation with the structural data and the results of quantum-chemical calculations, is attempted. Kubo and co-workers 6 have measured the magnetic susceptibility at room temperature of copper() salts of some α,ωdicarboxylic acids including adipic acid. Despite the lack of single-crystal structure data in their study, our powderedproducts synthetic strategy was that used in this paper.…”

“…Fig 6. The hydrogen bonded chains in complex 4 forming sheets parallel to the ac plane, together with the coordination sphere of Ni II .…”

Broad-Line Proton Magnetic Resonance Spectra of Dichloro (1,2,4-triazole) copper (II) and Bis (1,2,4-triazolato) copper (II)

“…A majority of copper(II) carboxylates are believed to have the same type of paired copper atoms. [16][17][18] In the so-called tricoordinated copper(II) complexes,19-21 copper atoms are bridged in pairs by two oxygen atoms, as was confirmed by X-ray crystal analysis carried out by Barclay,et al,22 on acetyl- Lastly, in copper(II) formate tetrahydrate,25 copper atoms are linked by -O-C-Ogroups of anti-anti arrangement to form a layer structure. It is known theoretically as well as experimentally that copper(II) complexes having one-dimensional arrays of equally spaced copper atoms do not show subnormal magnetic moments, because long-range spin interaction is absent in such structures.1•26…”