Electrochemistry of coordination compounds : XVI. New mixed 1,2-bis(diphenylphosphino)ethaneacetonitrile or -carbon monoxide iron(II), iron(I) and iron(0) complexes |
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| Authors: | Gianni Zotti Sandro Zecchin Giuseppe Pilloni |
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| Institution: | Consiglio Nazionale delle Ricerche, Laboratorio di Polarografia ed Elettrochimica Preparativa, C.P. 1075, 35100 Padova Italy |
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| Abstract: | The new iron compound, trans-Fe(DPE)2(MeCN)2] (ClO4)2 (DPE=PPh2CH2CH2PPh2), has been prepared and investigated electrochemically. In acetonitrile the complex shows two reduction steps, consistent with the formation of the stable iron(I) species, Fe(DPE)2(MeCN)]+ and the rather labile π-bonded acetonitrile adduct, Fe(DPE)2(π-MeCN), respectively. Acetonitrile substitution by carbon monoxide leads to formation of the carbonylated species, which have been characterized, and examined by electrochemical techniques. A significant feature is that trans-Fe(CO)2(DPE)2]2+, unlike trans-Fe(DPE)2(MeCN)2]2+, takes up two electrons in a single process, the unstable d7 intermediate undergoing a fast disproportionation. A tentative interpretation of this behaviour is suggested. |
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