ChemInform Abstract: CONFORMATIONAL ANALYSIS OF COORDINATION COMPOUNDS. IV. TRIS(1,2-ETHANEDIAMINE)- AND TRIS(2,3-BUTANEDIAMINE)COBALT(III) COMPLEXES

1979 ◽  
Vol 10 (1) ◽  
Author(s):  
S. R. NIKETIC ◽  
K. RASMUSSEN
Keyword(s):  
Conformational Analysis ◽  
Coordination Compounds

scholarly journals Corrigenda and Addenda to "Conformational Analysis of Coordination Compounds. I. Trisdiamine Cobalt(III) Complexes with Three Six-membered Chelate Rings".

1974 ◽  
Vol 28a ◽  
pp. 248-248 ◽  
Author(s):  
S. R. Niketić ◽  
F. Woldbye ◽  
F. Lindeløv ◽  
Terje Østvold ◽  
Alf Bjørseth ◽  
...  
Keyword(s):  
Conformational Analysis ◽  
Coordination Compounds ◽  
Chelate Rings

scholarly journals Conformational Analysis of Coordination Compounds. IV. Tris(1,2-ethanediamine)- and Tris(2,3-butanediamine)cobalt(III) Complexes.

1978 ◽  
Vol 32a ◽  
pp. 391-400 ◽  
Author(s):  
Svetozar R. Niketić ◽  
Kjeld Rasmussen ◽  
Supanich Pramatus ◽  
Yvonne Andersson ◽  
Stig Rundqvist ◽  
...  
Keyword(s):  
Conformational Analysis ◽  
Coordination Compounds

scholarly journals Conformational Analysis of Coordination Compounds. Tris-diamine Cobalt(III) Complexes with Three Six-membered Chelate Rings.

1973 ◽  
Vol 27 ◽  
pp. 621-642 ◽  
Author(s):  
S. R. Niketić ◽  
F. Woldbye ◽  
Christian Rømming ◽  
Steinar Husebye ◽  
P. Klæboe ◽  
...  
Keyword(s):  
Conformational Analysis ◽  
Coordination Compounds ◽  
Chelate Rings

Conformational analysis of coordination compounds: R-N,N,N',N'-Tetrakis-(2'-aminoethyl)-1,2-diaminopropanecobalt(III)

1967 ◽  
Vol 20 (11) ◽  
pp. 2395 ◽  
Author(s):  
JR Gollogly ◽  
CJ Hawkins
Keyword(s):  
Conformational Analysis ◽  
Metal Complexes ◽  
Coordination Compounds ◽  
A Priori ◽  
Van Der Waals ◽  
Energy Difference ◽  
Conformational Energy ◽  
Van Der Waals Interactions ◽  
Large Energy

The stereospecificity of the ligand, R-N,N,N?,N?-tetrakis(2?- aminoethyl)-1,2-diaminopropane, when coordinated as a sexadentate chelate to cobalt(III), has been investigated by an a priori calculation of the conformational energy difference between the various possible absolute configurations of the complex. It has been shown that the L isomer is more stable than the D isomer by an extremely large energy difference which is due mainly to van der Waals interactions. Some of the terms which contribute to conformational energy differences between metal complexes have not been considered previously.

Conformational analysis of coordination compounds. VII. Barrier to inversion of five-membered diamine chelate rings by N.M.R

1978 ◽  
Vol 31 (5) ◽  
pp. 973 ◽  
Author(s):  
CJ Hawkins ◽  
RM Peachey ◽  
CL Szoredi
Keyword(s):  
Low Temperature ◽  
Conformational Analysis ◽  
Shape Analysis ◽  
Coordination Compounds ◽  
Chelate Ring ◽  
Band Shape ◽  
Ring Strain ◽  
Coordination Numbers ◽  
Upper Limit ◽  
Chelate Rings

The barriers to δ ↔ λ interconversion for the five-membered diamine chelate rings in [M(CO)4(tmen)], where M is chromium(0), molybdenum(0), or tungsten(0) and tmen is N,N,N',N'-tetramethylethane-1,2-diamine, have been determined to be of the order of 39 kJ mol-1 from a band-shape analysis of 13C N.M.R. spectra of the compounds at low temperature. The results have been rationalized in terms of the effects of M-N bond lengths on ring strain energies and have been compared with the barriers determined previously for analogous complexes with coordination numbers of four (tetrahedral) and eight. The equivalent six-membered diamine chelate ring in [Mo(CO)4(tmtn)] was found to have a relatively low barrier to chair-to-chair interconversion with an upper limit of 34 kJ mol-1.

Conformational analysis of coordination compounds. VI. P.M.R. study of diamagnetic five-membered diamine chelate rings

1976 ◽  
Vol 29 (1) ◽  
pp. 33 ◽  
Author(s):  
CJ Hawkins ◽  
RM Peachey
Keyword(s):  
Magnetic Resonance ◽  
Conformational Analysis ◽  
Coordination Compounds ◽  
Proton Magnetic Resonance ◽  
Equatorial Orientation ◽  
Coupling Constant ◽  
Butyl Group ◽  
Magnetic Resonance Spectra ◽  
Chelate Rings

The proton magnetic resonance spectra of a number of coba1t(111), molybdenum(0), chromium(0), platinum(11) and palladium(11) complexes of (R)-propane-1,2-diamine, (S)-3,3-dimethylbutane-1,2- diamine, (RS)-N,N,N',N?-tetramethylpropane-1,2-dime and ethane-1,2-diamine have been analysed and the coupling constant data utilized to calculate the conformational populations for the various complexes. Necessary parameters for the conformational analysis were obtained from a study of tetracyano{(S)-3,3-dimethylbutane-1,2-diamine)cobaltate(111),in which the t-butyl group was assumed to be exclusively in the equatorial orientation. The preparation and resolution of this t-butyl substituted ethane-1,2-diamine are described.

scholarly journals Conformational Analysis of Coordination Compounds. III. Tris-diamine Cobalt(III) and Chromium(III) Complexes with Six-membered Chelate Rings.

1976 ◽  
Vol 30a ◽  
pp. 485-497 ◽  
Author(s):  
Svetozar R. Niketic ◽  
Kjeld Rasmussen ◽  
Flemming Woldbye ◽  
Shneior Lifson ◽  
Jouko Koskikallio
Keyword(s):  
Conformational Analysis ◽  
Coordination Compounds ◽  
Chelate Rings
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