An NCN-pincer ligand dysprosium single-ion magnet showing magnetic relaxation via the second excited state
作者:Guo, YN,Ungur, L,Granroth, GE,Powell, AK,Wu, CJ,Nagler, SE,Tang, JK,Chibotaru, LF,Cui, DM
关键字:molecule magnet; lanthanide complexes; anisotropy; exchange; transition; axiality; barrier

Single-molecule magnets are compounds that exhibit magnetic bistability purely of molecular origin. The control of anisotropy and suppression of quantum tunneling to obtain a comprehensive picture of the relaxation pathway manifold, is of utmost importance with the ultimate goal of slowing the relaxation dynamics within single-molecule magnets to facilitate their potential applications. Combined ab initio calculations and detailed magnetization dynamics studies reveal the unprecedented relaxation mediated via the second excited state within a new DyNCN system comprising a valence-localized carbon coordinated to a single dysprosium(III) ion. The essentially C2vsymmetry of the DyIII ion results in a new relaxation mechanism, hitherto unknown for mononuclear DyIII complexes, opening new perspectives for means of enhancing the anisotropy contribution to the spin-relaxation barrier.