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Roussin's red salt : ウィキペディア英語版 | Roussin's red salt
Roussin’s Red Salt is the inorganic compound with the formula K2(). This metal nitrosyl was first described by Zacharie Roussin in 1858, making it the first synthetic iron-sulfur cluster. ==Structure and bonding== Roussin's red salt anion is an edge-shared bitetrahedron, wherein a pair Fe(NO)2 units are bridged by a pair of sulfide ligands. The Fe-NO bonds are linear indicating NO is acting as a three electron donor. The diamagnetic compound obeys the 18-electron rule. The dark red colour of the complex is attributed to a number of charge-transfer interactions between the iron core and nitrosyl ligands.
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