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:
|[Zn(TPA)Cl]ClO4 (a) |
|[Zn((R,S)-a-MeTPA)Cl]ClO4 (b) |
|[Zn((R,S)-a-PhTPA)Cl]ClO4 (b) |
|[Zn((R,S)-a-MeBQPA)Cl]ClO4 (b) |
|[Cu(R-a-MeBQPA)(CH3CN)](ClO4 )2 (c) |
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).