The lanthanide-shifted N.M.R. spectra of some cyclopentadienone-cobalt complexes

1975 ◽  
Vol 28 (8) ◽  
pp. 1681 ◽  
Author(s):  
RS Dickson ◽  
SH Johnson ◽  
ID Rae
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Carbonyl Group ◽  
Structure Determination ◽  
Cobalt Complexes ◽  
Hydrogen Atoms ◽  
Pseudocontact Shifts ◽  
Lone Pairs ◽  
Nuclear Magnetic Resonance Spectra ◽  
Lanthanide Shift Reagents

The effect of the lanthanide shift reagents, Eu(fod)3 and Pr(fod)3, on the nuclear magnetic resonance spectra of some (η4-cyclopentadienone)(η- cyclopentadienyl)cobalt complexes has been investigated as an aid to structure determination in this series. The lanthanides complex with the lone pairs of the carbonyl group. Pseudocontact shifts are observed for hydrogens attached to each ring and for hydrogen atoms in substituents on the cyclopentadienone. With Eu(fod)3, contact shifts are also observed for the cyclopentadienone ring hydrogens.

Nuclear magnetic resonance spectra of ortho-, meta-, and para-difluorobenzenes in a nematic liquid crystal solvent

1969 ◽  
Vol 47 (6) ◽  
pp. 1057-1065 ◽  
Author(s):  
C. T. Yim ◽  
D. F. R. Gilson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Liquid Crystal ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Nematic Liquid Crystal ◽  
Hydrogen Atoms ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The proton and fluorine magnetic resonance spectra of ortho-, meta-, and para-difluorobenzene dissolved in a nematic liquid crystal solvent have been analyzed. Expressions for the anisotropy of the fluorine chemical shift were obtained but an attempt to fit these to the Karplus and Das theory failed. Hydrogen atoms ortho to fluorine show small displacements from their expected positions.

Transition metal complexes of substituted alkynes. II. Pentafluorophenylacetylene complexes of iron and cobalt

1968 ◽  
Vol 21 (1) ◽  
pp. 97 ◽  
Author(s):  
RS Dickson ◽  
DBW Yawney
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Cobalt Complexes ◽  
Spectroscopic Properties ◽  
Stable Complex ◽  
Structural Isomers ◽  
Nuclear Magnetic Resonance Spectra

Treatment of pentacarbonyliron with pentafluorophenylacetylene has given the stable complex tricarbonyl-2,5-bis(pentafluorophenyl)cyclopentadienoneiron. There is no evidence of the formation of other structural isomers. The complex is also formed from pentafluorophenylaoetylene and nonacarbonyldiiron or dodecacarbonyltriiron. Two alkyne-cobalt complexes have been isolated from the interaction of octacarbonyldicobalt and pentafluorophenylacetylene. One of these is a bridging alkyne complex of molecular stoicheiometry Co2(CO)6(C6F6CCH); the second is a complex of formula Co3(CO)9(CCH2C6F5). The infrared and nuclear magnetic resonance spectra of the complexes are given, and the probable structures of the compounds are deduced from these spectroscopic properties.

Sign in / Sign up

Export Citation Format

Share Document