Remarkable paramagnetically shifted (1)H and (2)H NMR spectra of iron(II) complexes of 2-aza-21-carbaporphyrin: an evidence for agostic interaction.
Iron(II) 2-aza-21-carbaporphyrins have been characterized by paramagnetically shifted (1)H and (2)H NMR spectra. The high-spin iron(II) complex (HCTPPH)Fe(II)Br displays the beta-H resonances which reflect the combination sigma and pi routes of spin density delocalization. The uniquely large isotropic shift of the inner H(21) hydrogen (812 ppm, 298 K) indicates an Fe(II)-[C(21)-H] agostic interaction.
Rachlewicz
Krystyna
K
Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie Street, Wrocław 50 383, Poland.
Wang
Sian-Ling
SL
Peng
Chih-Hsiung
CH
Hung
Chen-Hsiung
CH
Latos-Grazyński
Lechosław
L