Publication Date:
2018
Description:
〈p〉Orbital angular momentum is a prerequisite for magnetic anisotropy, although in transition metal complexes it is typically quenched by the ligand field. Here, by reducing the basicity of the carbon donor atoms in a pair of alkyl ligands, we synthesize a cobalt(II) dialkyl complex, Co(C(SiMe〈sub〉2〈/sub〉ONaphthyl)〈sub〉3〈/sub〉)〈sub〉2〈/sub〉, wherein the ligand field is sufficiently weak that interelectron repulsion and spin-orbit coupling play a dominant role in determining the electronic ground state. Assignment of a non-Aufbau (d〈i〉〈sub〉x〈/sub〉〈/i〉〈sup〉2〈/sup〉〈i〉〈sub〉–y〈/sub〉〈/i〉〈sup〉2〈/sup〉, d〈i〉〈sub〉xy〈/sub〉〈/i〉)〈sup〉3〈/sup〉(d〈i〉〈sub〉xz〈/sub〉〈/i〉, d〈i〉〈sub〉yz〈/sub〉〈/i〉)〈sup〉3〈/sup〉(d〈i〉〈sub〉z〈/sub〉〈/i〉〈sup〉2〈/sup〉)〈sup〉1〈/sup〉 electron configuration is supported by dc magnetic susceptibility data, experimental charge density maps, and ab initio calculations. Variable-field far-infrared spectroscopy and ac magnetic susceptibility measurements further reveal slow magnetic relaxation via a 450 cm〈sup〉–1〈/sup〉 magnetic excited state.〈/p〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Natural Sciences in General
