Carbon-13 and proton nuclear magnetic resonance spectra of some

2924 Inorganic Chemistry, Vol. 14, No. 12, I975

Malin, Schmidt, and Toma

Contribution from the Department of Chemistry, University of Missouri, Columbia, Missouri 65201, and the Instituto de Quimica, Universidade de Sao Paulo, Sao Paulo, Brazil

Carbon-13 and Proton Nuclear Magnetic Resonance Spectra of Some Pentacyanoferrate(I1) Complexes1 J O H N M. MALIN,*2 CHARLES F. SCHMIDT, and HENRIQUE E. TOMA Received May 7 , 1975

AIC50303W

Carbon-13 and proton nuclear magnetic resonance spectra have been obtained for a number of iron(I1) complexes Fe(CN)sLnin aqueous solution. For ligands L related to pyridine and pyrazine the effects of N-coordinated Fe(CN)s3- on the proton and 13C spectra are similar, showing downfield shifts for CY carbons (-8 ppm) and hydrogens (-0.6 ppm) and smaller, upfield shifts for /3 and y carbons and their substitutents. The cyano resonances in Fe(CN)sL"-(aq) are shifted upfield according to the sequence L = pyridine 4-methylpyridine < isonicotinamide cyanide pyrazine < N-methylpyrazinium dimethyl sulfoxide