14  Manganese, technetium and rhenium

Crystal Structure and Spin Frustration Behavior of an Oxo‐centered Trinuclear Chromium(III) Complex

“…The fitted J value of −11.1 cm −1 indicates the strong antiferromagnetic coupling between chromium(III) ions. This J value of complex 1 is of the same order of magnitude as the values observed in other oxo‐centered trinuclear chromium(III) complexes in Table …”

“…This J value of complex 1 is of the same order of magnitude as the values observed in other oxo-centered trinuclear chromium(III) complexes in Table 2. [22][23][24][25][26][27] The magnetic properties of 1 in the form of M vs. H at 2.0 K are presented in Figure 4. With increasing magnetic field, the effective magnetic moment gradually increases and approaches saturation beyond 6 T. The saturation value is 1.03 Nμ B , which is in good accordance with the value of gS ( g = 2.02, S T = 1/2).…”

“…The spins on M(1) and M(2) are paired, which is supposed to frustrate the spins on the M(3), as the intrinsic nature of the interaction is antiferromagnetic and M(3) cannot pair with M(1) and M(2) at the same time . It has been reported that spin frustration usually occurs in the isolated [M 3 O(O 2 CR) 6 L 3 ] and similar structures, when M = Cr, Mn, Fe, Co, Cu, or Ru . Recently, it has been demonstrated that frustration gives rise to complex magnetic properties such as chiral spin structures, orbitally driven magnetism, spin‐ice behavior exhibiting Dirac strings with magnetic monopoles, valence‐bond solids, and spin liquids …”