CONFORMATIONAL INVERSION OF 2,2′-BIPYRIDYL N,N′-DIOXIDE (bpdo) CHELATE RINGS IN THE [Cr(acetylacetonato)(bpdo)2]2+ ION
The [Cr(acetylacetonato)(bpdo)2](ClO4)2·H2O complex (bpdo= 2,2′-bipyridyl N,N′-dioxide) crystallizes in the lel2 (Δ(λλ), Λ(δδ)) isomer. This isomer isomerizes to the lel·ob (Δ(λδ), Λ(δλ)) isomer in aqueous solution with the rate constant of 3.31×10−3 s−1 at 295.2 K, the rate constant for racemization (Δ\ightleftarrowsΛ) being 1.08×10−4 s−1 at 295.2 K.