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Die Oxidation von Fe(CO)5 mit dem [NO]+‐Salz des schwach koordinierenden Perfluoroalkoxyaluminat‐Anions [F‐{Al(ORF)3}2]− (RF=C(CF3)3) führt zu stabilen Salzen der 18‐Valenzelektronenspezies [Fe(CO)4(NO)]+ und [Fe(CO)(NO)3]+ mit den Enemark‐Feltham‐Zahlen {FeNO}8 und {FeNO}10. Dies schließt 80 Jahre nach der Entdeckung der anionischen ([Fe(CO)3(NO)]−)‐ und neutralen ([Fe(CO)2(NO)2])‐Spezies endlich...
Attempts to prepare Fe(CO)5+ from Ag[Al(ORF)4] (RF=C(CF3)3) and Fe(CO)5 in CH2Cl2 yielded the first complex of a neutral metal carbonyl bound to a simple metal cation. The Ag[Fe(CO)5]2+ cation consists of two Fe(CO)5 molecules coordinating Ag+ in an almost linear fashion. The ν(CO) modes are blue‐shifted compared to Fe(CO)5, with one band above 2143 cm−1 indicating that back‐bonding is heavily decreased...
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