scholarly journals THE SINGLE-CRYSTAL AND ION-ASSOCIATION CIRCULAR DICHROISM SPECTRA OF THE BIS(R)-2-METHYL-1,4,7-TRIAZACYCIONONANE]COBALT(III) ION

1978 ◽  
Vol 7 (9) ◽  
pp. 1045-1048 ◽  
Author(s):  
Reiko Kuroda ◽  
Stephen Mason
Keyword(s):  
Circular Dichroism ◽  
Single Crystal ◽  
Ion Association ◽  
Circular Dichroism Spectra ◽  
Circular Dichroïsm

Solvent-dependent circular dichroism of trans-disubstituted Bis(R-propane-1,2-diamine)cobalt(III) complexes

1977 ◽  
Vol 30 (10) ◽  
pp. 2115 ◽  
Author(s):  
CJ Hawkins ◽  
GA Lawrance ◽  
RM Peachey
Keyword(s):  
Circular Dichroism ◽  
Metal Ion ◽  
Ion Association ◽  
Positive Contribution ◽  
Circular Dichroism Spectra ◽  
Hydrogen Bond Formation ◽  
Rotational Strength ◽  
Solvent Dependence ◽  
Halide Salts ◽  
Circular Dichroïsm

The circular dichroism spectra of trans-disubstituted bis(R-propane- 1,2-diamine)cobalt(III) complexes are reported for an extended series of solvents. The observed variations in the spectra of the dichloro and dibromo complexes are analysed in terms of stereoselective solvation at the diamine N-H protons, and also the ion association between the complexes and their counter-ions. The solvation of these dihalo complexes, which was studied by p.m.r., showed a preference for hydrogen-bond formation with the equatorial N-H protons, rendering the donor nitrogens asymmetric and thus introducing a new source of dissymmetry close to the metal ion chromophore. This affected a decrease in the positive rotational strength of the 1A1g → 1Eg (D4h) transition, and a positive contribution to the rotational strength of the 1A1g → 1A2g (D4h) component. Ion association of the dihalo complexes was evaluated by a comparison of the circular dichroism of the tetraphenylborate and halide salts. ��� The tendency for ion association was much greater for the tripositive diammine complex. However, stereospecific solvation was of little importance and the circular dichroism spectra did not show any marked solvent dependence for the tetraphenylborate salt.

Absorption and circular dichroism spectra of a single crystal of K3Pr2(NO3)9

1984 ◽  
Vol 110 (1) ◽  
pp. 95-98 ◽  
Author(s):  
Prabir Kumar Chatterjee ◽  
Asoke Nath ◽  
Debnarayan Nath ◽  
Mihir Chowdhury
Keyword(s):  
Circular Dichroism ◽  
Single Crystal ◽  
Circular Dichroism Spectra ◽  
Circular Dichroïsm
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