R. Saito, Y. Kidani
Jun 1, 1986
Citations
0
Influential Citations
3
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
Four 1,2-diamine ligands, (1RS,2SR)-1-methyl-1,2-cyclohexanediamine(1m-chxn), (1R,2S,3R)-3-methyl-1,2-cyclohexanediamine(R,S,R-3m-chxn), (1S,2R,4R)-4-methyl-1,2-cyclohexanediamine(S,R,R-4m-chxn), and (1R,2S,4R)-4-methyl-1,2-cyclohexanediamine(R,S,R-4m-chxn), were prepared. The mixed-ligand complexes of the [PtXL]2+ type(X=(NH3)2, 1,2-ethanediamine, meso-2,3-butanediamine, and 2,3-dimethyl-2,3-butanediamine, L=each m-chxn) were synthesized and characterized by means of their electronic, circular dichroism, and 13C NMR spectra. The chelate ring formed by S,R,R-4m-chxn was almost conformationally fixed to take a δ conformation, while the chelate rings of 1 m-chxn, R,S,R-3m-chxn, and R,S,R-4m-chxn easily interchange between δ and λ conformations. The stereochemistries of these three complexes are attributable to the conformational requirements for both the cyclohexane ring and the chelate ring, for which synchronous inversions are presumed.