The removal of protons and chloride, dehydrohalogenation, from (H₂L)FeCl₂ is investigated, to understand the reactivity of the implied transient LFe^II. Collective evidence shows that divalent iron is not strongly obedient to the 18 electron rule, although Fe^II is faithful to preferred coordination number 6; among all species reported here, only the Fe₂ and Fe₃ species have coordination number 5.

中文翻译：

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脱质子化，氯化物提取和脱卤化氢作为双吡唑并吡啶铁（II）配合物的合成途径。

研究了从（H ₂ L）FeCl _2中除去质子和氯化物，脱卤化氢，以了解隐含的瞬态LFe ^II的反应性。集体证据表明，尽管Fe ^II忠实于优选的配位数6 ，但二价铁并不是强烈遵守18电子规则。在这里报道的所有物种中，只有Fe ₂和Fe ₃物种的配位数为5。