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Nuclear magnetic resonance studies on the formation of azaferrocene complexes of iron(III) porphyrins.
Autorzy
Rok wydania
1996
Czasopismo
Numer woluminu
20
Strony
939-944
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The titration of high-spin triflate (OEP)FeIII(OTf), (TPP)FeIII(OTf), and (TMP)FeIII(OTf) complexes with azaferrocene (η5-C4H4N)(η5-C 5H5)FeII (AF) in chloroform solutions has been monitored by 1H NMR spectroscopy. The formation of high-spin mono-ligated PFeIII(AF) complexes has been observed in the early titration stages. The final reaction products are low-spin [PFeIII(AF)2]+ complexes. The 1H NMR results showed that dynamic equilibria between mono-and bis-ligated species were present. The rotation of AF around the N-FeIII(P) bond is fast on the NMR scale. The electronic structure and the distribution of the spin density of the bis-ligated PFeIII(AF)2 complexes are discussed on the basis of isotropic shift analysis.
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