David Y. Jeter

Out-of-plane interactions in dichlorobis(2-methylpyridine)- copper(II) and dibromobis(2-methylpyridine)copper(II)

Abstract The magnetic susceptibilities of dichlorobis(2-methylpyridine)copper(II) and dibromobis(2-methylpyridine)copper(II) have been measured in the temperature range 4.2–300°K. The data for both compounds obey the Van Vleck equation for ecxhange coupled copper ions with the singlet-triplet separation being 5 cm−1 for the bromo-complex and 7.4 cm−1 for the chloro-complex. The singlet state is the ground state in both cases.

Out-of-plane chain interactions in dichlorobis(pyridine)copper(II) and dibromobis(pyridine)copper(II)

Abstract The magnetic susceptibilities of powdered samples of Cu(pyridine)2Cl2 and Cu(pyridine)2Br2 have been measured in the temperature range 8–297°K. The data reflect an antiferromagnetic interaction with Tmax near 18° for the chlorocomplex and near 36°K for the bromocomplex. The data are discussed in terms of the Heisenberg and Ising models of antiferromagnetic interactions in chains.

The magnetism of potassium dioxalatocuprate(II) dihydrate and ammonium dioxalatocuprate(II) dihydrate

Abstract The magnetic susceptibilities of the potassium and ammonium salts of dioxalatocuprate(II) dihydrate have been measured in the temperature range 2.9–296°K. The electron paramagnetic resonance spectra give evidence for weak spin-spin coupling which is confirmed by the magnetic susceptibility data. The mechanism for the weak interaction is transmitted by the oxalate bridges.

The magnetism of di-μ-N,N′-m-phenylenetetrakis(salicylideneiminato)dicopper(II)

Abstract The magnetic susceptibility of the dimer di-μ-N,N′-m-phenylenetetrakis(salicylideneiminato)dicopper(II) obey the Curie-Weiss law over the temperature range 2.7–290°K yielding μeff = 1.73 B. M. The electron paramagnetic resonance spectrum gives evidence for the triplet state as well as lines which apparently arise from transitions between the singlet ground state and the excited triplet state.

THE STRUCTURAL AND MAGNETIC CHARACTERIZATION OF THE BINUCLEAR CHROMIUM COMPLEX DI-μ-HYDROXOTETRAGLYCINATODICHROMIUM(III)

Abstract The binuclear complex [Cr(gly)2OH]2, where gly=NH4C2O2 −, has been the subject of much interest since its initial report by Ley and Ficken3 in 1912. Earnshaw and Lewis4 have reported the magnetic susceptibility variation for the complex in the temperature range 306–80°K, and although the maximum in susceptibility occurs below the lower limit of this range they were able to conclude from fitting procedures that an antiferromagnetic interaction existed and that the value of 2J (the singlet-triplet splitting) is -8cm−1.

The structural and magnetic characterization of μ-hydroxobis[pentaamminechromium(III)] chloride monohydrate, the acid rhodo complex

Abstract The structure of hydroxo-bridged μ-hydroxobis [pentaamminechromium(III)] chloride monohydrate has been redetermined and the CrO Cr angle found to be 166(1)° The temperature variation of the magnetic susceptibility may be explained in terms of an exchange hamiltonian with or without a biquadratic exchange term.

The magnetism of copper(II) croconate trihydrate

Abstract The magnetic susceptibility of copper(II) croconate trihydrate has been measured in the temperature range 3·0–292°K. Although there is an absorption in the electron paramagnetic resonance spectrum at 1430 G which is indicative of spin-spin interactions between the copper(II) ions which are bridged by the croconate ligands in the chain structure, the magnetic susceptibility data show that the magnitude of the interaction is less than 3°K.

MAGNETIC PROPERTIES OF HEXAMMINECOBALT(III) TRIBROMODICHLOROCUPRATE(II)

The magnetic susceptibility of hexamminecobalt(III) tribromodichlorocuprate(II) has been measured in the temperature range 4.2–292° K. There is a distinct minimum in the (χ m )−1 versus T plot near...