Manganese(I) based molecular squares of type [Mn(CO)₃Br(μ-L)]₄ where L = pyrazine, 4,4′-bipyridine, trans-1,2-bis(4-pyridyl)ethylene were synthesized and studied in detail by EPR spectroscopy. The continuous wave electron paramagnetic resonance (CW EPR) spectrum of these compounds consists of a broad transition at g = 2.006 and 4.16 that corresponds to an interacting low spin Mn(II) center and a narrow transition at g = 2.004 that corresponds to a nitrogen center radical. These results are discussed in detail and the observation of these characteristic EPR spectral signals is attributed to a partial transfer of an electron from Mn(I) center to the nitrogenous ligand through MLCT.

合成了类型为[Mn（CO）₃ Br（μ-L）] _4的锰（I）分子广场，其中L =吡嗪，4,4'-联吡啶，反式1,2-双（4-吡啶基）乙烯并通过EPR光谱进行了详细研究。这些化合物的连续波电子顺磁共振（CW EPR）谱由 对应于相互作用的低自旋Mn（II）中心的g = 2.006和4.16处的宽跃迁和 对应于氮的g = 2.004处的窄跃迁组成中心偏激。对这些结果进行了详细讨论，对这些特征性EPR光谱信号的观察归因于电子通过MLCT从Mn（I）中心向含氮配体的部分转移。