602. The magnetic properties of some d 3-complexes

Abstract

The magnetic properties of twenty-one complexes of chromium, molybdenum, rhenium, osmium, and iridium have been measured between 80" and 300" K. The results are discussed with reference to the relation between the ligand fields, the interelectronic repulsions, and the spin-orbit coupling of the ions, and to the magnetic exchange between the ions. The results may be accounted for with reasonable values of the parameters after the fourth of these effects has been allowed for.

Studies of β-Diketone Complexes of Rhenium. Part II. Physical Studies of Dihalobis(pentane-2,4-dionato)rhenium(IV) Compounds

“…In addition our magnetic susceptibility data are very similar to those for MiReX, compounds (16,17) where an excellent treatment of the data has been made by Eisenstein (14) using a value of a % 100 x lo-, c.g.s.u. Can.…”

Synthesis, Crystal Structure and Magnetic Properties of Heteropolynuclear ReIVMII Complexes Based on the Robust [ReCl5(pyzCOO)]2– Unit (pyzCOO = 2‐pyrazinecarboxylate)

“…Rhenium(IV) is a 5d 3 ion that usually forms inert, relatively stable, octahedral complexes. [8] The high value of the spin-orbit coupling constant of around 1000 cm -1 for the free ion [9] is the main factor responsible for its large magnetic anisotropy. In fact, the combination of spin-orbit coupling and low molecular symmetry explains the SMM behaviour of even mononuclear Re IV compounds, as in the case of the recently reported (NBu 4 ) 2 [ReBr 4 (ox)].…”

The electronic spectra of the hexafluoro complexes of the second and third transition series

“…A magnetic moment of 3.23 B.M. at 298 °K was found for CsOsF6 (46), and diffuse reflectance studies of the spectrum have been reported by Brown et al (32) and by Allen et at. (10).…”

“…band either the -* t2g or a ~ -* t2g assignment is possible. (31,46). The electronic spectrum in aqueous solution has been studies in some detail by Jorgensen and Schwochau (29), and the principle features of their results are listed in Table 11.…”

“…cm -1, ~ = 3400 cm -1, C/B = 4.75.c) Iridium hexafluoride, IrF6The magnetic susceptibility of IrF~ was studied by Figgis, Lewis, and Mabbs(46) who found a moment of about 2.90 B.M. at 300 °K.…”