Links - 彦臻 Yan-Zhen Zheng 郑 - 教师个人主页.pdf

SUPEREXCHANGE bonding interactions result in AFMcoupled metal spins AFM 3d Ligand 2p FM 3d Ligand 2p 3d unfilled orbital orthogonal to filled orbital: FM-coupled metal spins 3d + 3d vacant AFM delocalized ligand π electron ligand spins AFM-coupled thru empty metal d-π orbitals (metal diamagnetic) delocalized ligand π electron ligand spins FM-coupled thru empty metal p-σ orbitals (metal diamagnetic) FM DOUBLE EXCHANGE FM Transfer of the minority spin can occur only if majority spins are aligned parallel Occurs in Mixed Valent systems