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. By reducing the basicity of the carbon donor atoms in a pair of alkyl ligands, we synthesized a cobalt(II) dialkyl complex, Co(C(SiMe〈sub〉2〈/sub〉ONaph)〈sub〉3〈/sub〉)〈sub〉2〈/sub〉 (where Me is methyl and Naph is a naphthyl group), 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〈sub〉〈i〉x〈/i〉〈sup〉2〈/sup〉〈/sub〉〈sub〉〈i〉–y〈/i〉〈sup〉2〈/sup〉〈/sub〉, 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〈sub〉〈i〉z〈/i〉〈sup〉2〈/sup〉〈/sub〉)〈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–wave number magnetic excited state.〈/p〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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