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|Section2= |Section3= |Section7= |Section8= }} Sodium ferrioxalate, also known as sodium oxalatoferrate, is a chemical compound with the formula Na3(), where iron is in the +3 oxidation state. It is an octahedral transition metal complex in which three bidentate oxalate ions act as ligands bound to an iron centre. Sodium acts as a counterion, balancing the -3 charge of the complex. Crystals of the hydrated form of the complex, Na3().xH2O, are lime green in colour. In solution the complex dissociates to give the ferrioxalate anion, ()3−, which appears a deep apple green in colour. ==Bonding== The bonds to the iron atom are dative covalent bonds where the ligands, (oxalate ions, blue), donate a lone pair into the empty p and d orbitals of the transition metal (iron, red), atom. The three oxalate ions donate 12 electrons in all and Fe-III has three electrons in the d orbitals leaving 13 empty places in the remaining d and p orbitals. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sodium ferrioxalate」の詳細全文を読む スポンサード リンク
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