pH‐Controlled Multiple Chiral Inversion That Induces Molecular Dimerization in a Gold(I)–Cobalt(III) Coordination System with L‐Cysteinate |
| |
| Authors: | Pei‐Shan Lee Dr Asako Igashira‐Kamiyama Dr Naoto Kuwamura Dr Nobuto Yoshinari Prof Takumi Konno |
| |
| Institution: | 1. Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560‐0043 (Japan);2. JST‐CREST, Toyonaka, Osaka 560‐0043 (Japan) |
| |
| Abstract: | Herein, a unique coordination system that exhibits multiple chiral inversions and molecular dimerization in response to a subtle pH change is reported. Treatment of (Δ)2‐H3Au3Co2(L ‐cys)6] (H3 1 a ]) with Co3(aet)6](NO3)3 (aet=2‐aminoethanethiolate) in water at pH 7 gave a 1:1 complex salt of Co3(aet)6]3+ and 1 a ]3?, retaining the AuI3CoIII2 structure and chiral configurations of 1 a ]3?. Similar treatment at pH 9 led to not only the inversion of all of the chiral CoIII and S centers but also the dimerization of 1 a ]3?, giving a 2:1 complex salt of Co3(aet)6]3+ and (Λ)4(R)12‐Au6Co4(L ‐cys)12]6? ( 2 ]6?). When dissociated from Co3(aet)6]3+ in solution, 2 ]6? was converted to (Λ)2(R)6‐Au3Co2(L ‐cys)6]3? ( 1 b ]3?) with retention of the chiral configurations. |
| |
| Keywords: | amino acids chirality gold heterometallic complexes S ligands |
|
|
