Rational syntheses of multinuclear high-spin complexes

Abstract

Magnetic interactions within or between molecules are typically antiferromagnetic, and careful design of multinuclear complexes by considering magnetic orbital symmetry and bridging structures is necessary for preparing metal complexes with high-spin ground states. First, we present the rational syntheses of high-spin molecules with ferromagnetic interactions. In the latter part of this article, our synthetic methodology for high-spin molecules was applied to prepare homo- and hetero-metal single-molecule magnets (SMMs). In the homo-metal SMMs, high-spin ground states can be achieved by assembling ferrous ions in the cubic shape, and they show superparamagnetic behavior due to easy axis magnetic anisotropy of the molecules. Furthermore, control of magnetic anisotropy of single ions and multinuclear complex molecules is presented. A facile one-pot synthesis for hetero-metal complex has been developed, and SMM behaviors of the obtained hetero-metal clusters are presented. © 2007 The Chemical Society of Japan.