Low molecular weight organic molecules that can accept multiple electrons at high reduction potentials are sought after as electrode materials for high-energy sustainable batteries. To date their synthesis has been difficult, and organic scaffolds for electron donors significantly outnumber electron acceptors. Herein, we report the synthesis and electronic properties of two highly electron-deficient phosphaviologen derivatives from a phosphorus-bridged 4,4'-bipyridine and characterize their electrochemical properties. Phosphaviologen sulfide (PVS) and P-methyl phosphaviologen (PVM) accept two and three electrons at high reduction potentials, respectively. PVM can reversibly accept three electrons between 3–3.6 V vs. Li/Li⁺ with an equivalent molecular weight of 102 g (mol⁻¹ e⁻) (262 mA h g⁻¹), making it a promising scaffold for sustainable organic electrode materials having high specific energy densities.

中文翻译：

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磷酰基和phospho桥接的紫精单体作为有机电极的稳定的二电子和三电子受体

寻求可以在高还原电势下接受多个电子的低分子量有机分子作为高能可持续电池的电极材料。迄今为止，它们的合成一直很困难，并且用于电子给体的有机支架大大超过了电子受体。在本文中，我们报道了两个高电子缺陷的磷-桥连的4,4'-联吡啶的磷酸电子卵磷脂衍生物的合成和电子性质，并表征它们的电化学性质。硫磷紫罗兰硫化物（PVS）和P-甲基磷aviologen（PVM）分别以高还原电位接受两个和三个电子。PVM可以可逆地接受3–3.6 V vs. 3 V之间的三个电子。Li / Li ⁺的当量分子量为102 g（mol ^-1 e ^-）（262 mA hg ^-1），使其成为具有高比能量密度的可持续有机电极材料的有前途的支架。