Magnetic moments cations

In contradistinction to this, weak ferromagnetism has been observed in a number of chloro and bromo complexes of the type M2[CrX4] (M = a variety of protonated amines and alkali metal cations, X = Cl, Br), which are analogous to previously known copper(II) complexes (p. 1192). They have magnetic moments at room temperature in the region of 6BM (compared... 

There have been no reports of complexes of " JV-substituted thiosemicarbazones derived from 2-formylpyridine, but 2-acetylpyridine JV-methyl-thiosemicarbazone, 3a, formed [Fe(3a-H)2]C104 and [Fe(3a-H)2]FeCl4 [117]. The nature of these two species was established by partial elemental analyses, molar conductivities, magnetic moments, electronic, infrared, mass and electron spin resonance spectra. A crystal structure of a related selenosemicarbazone complex confirmed the presence of a distorted octahedral iron(III) cation coordinated by two deprotonated anions so that each ligand is essentially planar and the azomethine nitrogens are trans to each other the pyridyl nitrogen and selenium donors are both cis. 

An interesting study of oxidic spinel ferrites of the type CO cNi5/3 xFeSbi/304 was reported [21], where three different Mbssbauer-active probes Fe, Ni and Sb were employed on the same material. The results have been interpreted in terms of the cation distributions over spinel A- and B-lattice sites, magnetic moments and spin structure, and the magnitude of the supertransferred hyperfine... 

An Ir11 intermediate in the carbonylation of ethanol, stabilized by the isoquinoline cation, has been isolated and characterized.496 IrCl3 31FO is the catalyst precursor and HI the promoter. The intermediate analyzes as (C9H8N)[Ir(CO)2l3(COC2H5)]. The magnetic moment is measured at 1.33 B.M., which is indicative of Ir1. 

Given the apparent relationship between covalence and contraction of the unit cell volume described previously, it should be possible to relate Rv to the reduction in magnetic moment found by resonance and neutron diffraction. In this we are limited to the cations Mn2+, Fe2+, Co2+, and Ni2+ in octahedral coordination. 

Hexafluororhenate(V) salts are obtained by the interaction of the appropriate alkali metal iodide with ReFg in either SO 2 or IF5 (57). For most cations the magnetic moments lie between about 1.3 and 1.4 B.M. at 298 °K, slightly higher results being found for the potassium salt (39). 

Any salt formed from two ion-radicals has two unpaired electrons one belongs to the cation-radical and the other to the anion-radical. If the spins of these two electrons have an antiparallel orientation, the corresponding magnetic moments are compensating. If both spins are in parallel orientation, their magnetic moments are added together. 

Magnetic coupling, between dimeric iron ions, diiron-oxygen proteins, 43 365-366 Magnetic interactions, 20 134-142 direct cation-cation, 20 139, 140 indirect cation-anion-cation, 20 140-142 Magnetic measurements, 32 58 Magnetic moments... 

Useful applications of the Evans proton NMR shift method have permitted the determination of effective magnetic moments peff (see Section 8) and spin multiplicities for several high-spin radical-cation species.This work makes available a simple procedure for such assignments when the spin carriers are stable in solution. 

Ferrite compounds with the inverse spinel structure are similar to magnetite, with different ions substituting for the iron atoms. As with FeO (cf. Figure 6.62), the oxygen ions have no permanent magnetic moment. Tetrahedral sites in the FCC oxygen array are occupied by half of the trivalent cations, and octahedral sites are occupied equally by divalent cations and the remaining trivalent cations. 

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