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Spin delocalization from paramagnetic metal complexes [Cr(acac) 3 and Fe(acac) 3 ] to saturated hydrocarbons in CHCl 3 and CCl 4 solutions
Author(s) -
Kitaigorodskii Alexander N.,
Stepanov Alexander G.,
Nekipelov Vyatcheslav M.
Publication year - 1986
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260240815
Subject(s) - chemistry , paramagnetism , delocalized electron , unpaired electron , molecule , metal , carbon atom , atom (system on chip) , hydrocarbon , chromium , crystallography , inorganic chemistry , photochemistry , organic chemistry , ring (chemistry) , condensed matter physics , physics , computer science , embedded system
Abstract Paramagnetic 13 C NMR shifts induced by tris(acetylacetonato)chromium(III) [Cr(acac) 3 ] and tris(acetylacetonato)iron(III) [Fe(acac) 3 ] in various saturated hydrocarbons were determined for the first time using a special technique. The observed shifts, Δδ spec , are the result of partial delocalization of unpaired electrons from the paramagnetic complexes on the alkanes. The value of Δδ spec depends strongly on the position of a carbon atom in the hydrocarbon molecule, and tends to decrease on passing from primary to quaternary carbon atoms. The observed spin transfer seems to reflect the ‘contact charge transfer.’ The Δδ spec shifts in the unsaturated hex‐1‐ene only slightly exceed those in alkanes.