Standards for magnetic measurements. A comparison and a proposal for the use of tetramethylethylenediammonium tetrachlorocuprate(II)

Abstract

The magnetic properties of three compounds which are appropriate as magnetic susceptibility standards have been studied in detail. A new value of -1.86 ± 0.01 K has been determined for the Weiss constant of HgCo(NCS)4, and the zero-field splitting parameter, D, has been found to be +19 ± 3 cm1 with g being 2.22 ± 0.03. The magnetic data for bis(2,2'-bipyridine)thioureacopper(II) perchlorate may be reproduced accurately from the expression M = Ng¡/¡JB3(X) where B3(X) = [(2-7 + l)/2J] coth ([(2J + 1)/2J]X| -(1/2J) coth (X/2J) and X = g$JH/kT using g = 2.1175, the average of the single crystal EPR g values. The magnetic data for [(C-H3)2NHCH2CH2NH(CH3)2]CuC14 may also be reproduced by these expressions using g = 2.15. This latter compound is suggested to be a convenient magnetic susceptibility standard.

Superparamagnetic-like behavior and spin–orbit coupling in (Co,Zn)RE4W3O16 tungstates (RE=Nd, Sm, Eu, Gd, Dy and Ho)

“…Such levels above the ground state may not contribute to the magnetic susceptibility [20]. Similar behaviour has been observed for Sm 2 WO 6 and cm 3 /g reported by Brown et al [22] or T -. and F 0 = 0.48410 -6 cm 3 /g reported by Nelson and ter Haar [23].…”

Syntheses, structures, magnetic, and spectroscopic properties of cobalt(ii), nickel(ii) and zinc(ii) complexes containing 2-(6-methyl)pyridyl-substituted nitronyl and imino nitroxide†

“…The best-fit parameters obtained are: g Co = 2.336(1), J = Ϫ144(2) cm Ϫ1 and |D| = 31.9(1) cm Ϫ1 for complex 2: g Co = 2.442(4), J = Ϫ195(26) cm Ϫ1 and |D| = 21.4(5) cm Ϫ1 for complex 2Br. Since the obtained g Co and |D| values are considered to be acceptable in view of the corresponding parameters of the other tetrahedral Co II complexes concerned, 21 it can be concluded that the magnetic coupling between Co II and IMmepy is largely antiferromagnetic.…”

Magnetic susceptibilities and the order parameters of some 4,4' -disubstituted biphenyl cyclohexanes

“…This balance has an accuracy of 2 J.lg. The calibration of H F was carried out by a measurement on z HgCo(SCN)4, which has a mass susceptibility of 16.44 x 10 -6 cm'/g at 20°C [10]. The sample container was held in a double cylinder of glass in which temperatures were attained with a thermostated liquid.…”