First Diastereomerically Controlled Aggregation ofL-Cysteinato Cobalt(III) Octahedra, Assisted by Silver(I) Ions

Abstract

Sheetlike and helical coordination polymers, {ΛL‐[Ag{Co(L‐cys‐N,S)(en)2}](NO3)2}∞ (1) and {ΔL‐[Ag{Co(L‐cys‐N,S)(en)2}](NO3)2}∞ (2), were obtained by treating ΛL‐ and ΔL‐[Co(L‐cys‐N,S)(en)2]+ (L‐cys=L‐cysteinate, en=H2NCH2CH2NH2) with AgNO3 in water, respectively. Their structures are comparable to those of the β‐sheet and α‐helix forms of proteins. Compound 2 undergoes reversible conversion into a third compound on changing the pH of the solution.