TY - JOUR
T1 - Chiral metal complexes 2. Light-catalysed diastereoisomeric equilibration in aqueous solutions of cis-[Ru(phen)2(L-serine)]+ and its 2,2′-bipyridyl analogue
AU - Vagg, Robert S.
AU - Williams, Peter A.
PY - 1981
Y1 - 1981
N2 - The compounds of general form Δ,Λ-[Ru(diimine)2(L-ser)]ClO4·nH2O where L-ser is the L-serinate anion, diimine is 1,10-phenanthroline and 2,2′-bipyridyl, and n = 1.0 and 0.5 respectively, have been isolated and the complex ions resolved using cation exchange chromatography. The Λ-isomer of the bipy complex and the Δ-isomer of the phen complex spontaneously invert in aqueous solution in the presence of light. The equilibrium constants for the reaction Δ-[Ru(diimine)2(L-ser)]+ (aq) ⇌ Λ-[Ru(diimine)2(L-ser)]+ (aq) are 1.28(3) and 0.71(5) at 298.2 K for the phen and bipy complex cations respectively. The apparently anomalous behaviour of the bipy complex compared with other related systems indicates that steric factors are not always the most important contributors to chiral discriminations in this class of complexes.
AB - The compounds of general form Δ,Λ-[Ru(diimine)2(L-ser)]ClO4·nH2O where L-ser is the L-serinate anion, diimine is 1,10-phenanthroline and 2,2′-bipyridyl, and n = 1.0 and 0.5 respectively, have been isolated and the complex ions resolved using cation exchange chromatography. The Λ-isomer of the bipy complex and the Δ-isomer of the phen complex spontaneously invert in aqueous solution in the presence of light. The equilibrium constants for the reaction Δ-[Ru(diimine)2(L-ser)]+ (aq) ⇌ Λ-[Ru(diimine)2(L-ser)]+ (aq) are 1.28(3) and 0.71(5) at 298.2 K for the phen and bipy complex cations respectively. The apparently anomalous behaviour of the bipy complex compared with other related systems indicates that steric factors are not always the most important contributors to chiral discriminations in this class of complexes.
UR - http://www.scopus.com/inward/record.url?scp=0242399946&partnerID=8YFLogxK
U2 - 10.1016/S0020-1693(00)88574-6
DO - 10.1016/S0020-1693(00)88574-6
M3 - Article
AN - SCOPUS:0242399946
SN - 0020-1693
VL - 52
SP - 69
EP - 72
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - C
ER -