Dynamic control of topological asymmetry:
Physical studies
Once the ligands were made, complexes with Zn(II) and Cu(II) were obtained. Crystals of these complexes were grown and X-ray data collected as shown in Table 2 below:
(a) Structure shown is the d conformer. (b) Structures obtained using racemic ligand. (c) Structure determined using enantiomerically pure ligand.
A list of the full chemical names for the ligands is available.
NOTE: Netscape 2.x users with the Chemscape Chime plug-in will see spacefilling representations of the X-ray structures in the table above which can be manipulated.
To observe the conformation of the complexes in solution, Circular Dichroism (CD) spectra for a selected number of these compounds obtained from the enantiomerically pure ligands, were acquired as shown below (Figure 6).
Figure 6: CD and UV-vis spectra (in methanol)
[Zn(R-a-MeTPA)Cl]ClO4
![[CD and UV-vis spectra: [Zn(MeTPA)Cl]ClO4 in methanol]](mtpacd.gif)
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[Zn(S-a-MeBQPA)Cl]ClO4
![[CD and UV-vis spectra: [Zn(MeBQPA)Cl]ClO4 in methanol]](mbqpcd.gif)
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References:
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Allen, C.S.; Chuang, C-L.; Cornebise, M.; Canary, J.W.
Inorg. Chim. Acta 1995, 239, 29.
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Canary, J.W.; Allen, C.S.; Castagnetto, J.M.; Wang, Y.; Xu, X.,
manuscript in preparation.
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Canary, J.W.; Allen, C.S.; Castagnetto, J.M.; Wang, Y.
J. Am. Chem. Soc. 1995, 117, 8484.
Page maintained by Jesus M. Castagnetto,
[jesus@canarylab.chem.nyu.edu]. Last Updated: June 2 ,1996