Polymer‐Supported Optically Active fac ( S )‐Tris(thiotato)rhodium(III) Complex for Sulfur‐Bridging Reaction With Precious Metal Ions

The optically active mixed‐ligand fac ( S )‐tris(thiolato)rhodium(III) complexes, Δ L ‐ fac ( S )‐[Rh(aet) 2 (L‐cys‐ N , S )] − (aet = 2‐aminoethanethiolate, L‐cys = L‐cysteinate) ( 1 ) and Δ LL ‐ fac ( S )‐[Rh(aet)(L‐cys‐ N , S ) 2 ] 2− were newly prepared by the equatorial preference of the carboxyl group in the coordinated L‐cys ligand. The amide formation reaction of 1 with 1,10‐diaminodecane and polyallylamine gave the diamine‐bridged dinuclear Rh(III) complex and the single‐chain polymer‐supported Rh(III) complex with retention of the Δ L configuration of 1 , respectively. These Rh(III) complexes reacted with Co(III) or Co(II) to give the linear‐type trinuclear structure with the S ‐bridged Co(III) center and the two Δ ‐Rh(III) terminal moieties. The polymer‐supported Rh(III) complex was applied not only to the CD spectropolarimetric detection and determination of a trace of precious metal ions such as Au(III), Pt(II), and Pd(II) but also to concentration and extraction of these metal ions into the solid polymer phase. Chirality 28:85–91, 2016 . © 2015 Wiley Periodicals, Inc.