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.

Transition metal complexes of substituted alkynes. IV. Some bridging alkynecobalt complexes

1969 ◽  
Vol 22 (3) ◽  
pp. 533 ◽  
Author(s):  
RS Dickson ◽  
DBW Yawney
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Spectroscopic Properties ◽  
Terminal Alkynes ◽  
Nuclear Magnetic Resonance Spectra ◽  
Direct Formation ◽  
Formation Of Complexes

Two new organocobalt complexes, Co2(CO)4(CF3C2CF3)3 and Co2(CO)4(CF3C3H)2- CF3C2CF3, have been isolated from the appropriate reactions of hexafluorobut-2-yne with octacarbonyldicobalt and of 3,3,3- trifluoropropyne with μ-hexafluorobut-2-yne-hexacarbonyldicobalt. The probable structures of these compounds are discussed in light of their infrared and nuclear magnetic resonance spectra. ��� The direct formation of complexes of the type Co3(CO)9CCH2R has been established in the reactions of several terminal alkynes, RC2H (R = H, CF3, C6H5), with octacarbonyldicobalt. The spectroscopic properties of the products so obtained are given.

Transition metal complexes of substituted alkynes. I. 3,3,3-Trifluoropropyne complexes of iron and cobalt

1967 ◽  
Vol 20 (1) ◽  
pp. 77 ◽  
Author(s):  
RS Dickson ◽  
DBW Yawney
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Metal Complex ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Mass Spectra ◽  
The Other ◽  
Stable Complex ◽  
Structural Isomers ◽  
Metal Metal

Treatment of pentacarbonyliron with 3,3,3-trifluoropropyne, CF3C≡CH, has given the stable complex tricarbonylbis(trifluoromethyl)cyclopentadi- enoneiron. Although a disubstituted cyclopentadienone can exist as three structural isomers, only one metal complex has been isolated. The interaction of octacarbonyldicobalt and 3,3,3-trifluoropropyne has given two metal complexes, one of which is a bridging alkyne complex of molecular stoicheiometry Co2(CO)6(CF3CCH); the other, of formula Co2(CO)4(CF3CCH)3, is shown to have a metal-metal bridging unit which is formed by condensation of three alkyne groups. Infrared, nuclear magnetic resonance, and mass spectra of these complexes are given, and the structures of the compounds described.

Structure of the Second Coordination Sphere of Transition Metal Complexes. III. Ion Pairing involving Cobalt Complexes

1971 ◽  
Vol 49 (16) ◽  
pp. 2751-2754 ◽  
Author(s):  
D. R. Eaton ◽  
Linda Seville ◽  
J. P. Jesson
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Symmetry Axis ◽  
Cobalt Complex ◽  
Cobalt Complexes ◽  
Ion Pair ◽  
Acetonitrile Solution

The structure of the ion pair formed between Co(II) bistripyrazolylmethane ions and PF6− ions in acetonitrile solution has been investigated. Isotropic shifts observed in the 19F nuclear magnetic resonance (n.m.r.) spectra of the anion have been used for this purpose. It is concluded that the preferred position of the anion lies close to the symmetry axis of the cobalt complex and that a contact ion pair is involved. This result is contrasted with previous studies of second sphere coordination involving neutral molecules.

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