Geometry of the iminium moiety. III. Structures of a chiral form of bis[4,5‐dihydro‐3,5,5‐trimethyl‐1‐(3'‐methylcyclopentylidene)pyrazolium] hexachlorostannate and the racemate

Compound (I) MPDL, bis[4,5-dihydro-3,5,5-trimethyl-1-(3'-methylcyclopentylidene)pyrazolium) hexachlorostannate, [C 12 H 21 N 2 ] 2 . + [SnCl 6 ] 2- , M r =718.0, monoclinic, P2 1 /n, a=10.002 (2), b=10.639 (1), c=15.616 (4) A, β=102.05 (2) o , V=1625.1 (2) A 3 , Z=2, D m =1.46 (1), D x =1.467 g cm -3 , λ(Mo Kα)=0.71069 A, μ=13.1 cm -1 , F(000)=732, T= 294 K, R=0.035 for 2291 observed reflections with I>2σ(I). Compound (I) MPCH, bis[(R)-4,5-dihydro-3,5,5-trimethyl-1-(3'-methylcyclopentylidene)pyrazolium) hexachlorostannate, [C 12 H 21 N 2 ] 2 . + [SnCl 6 ] 2- , M r =718.0, monoclinic, P2 1 , a=9.998 (2), b=10.649 (1), c=15.637 (4) A, β=102.03 (2) o , V=1628.3 (3) A 3 , Z=2, D m =1.48 (1), D x =1.493 g cm -3 , λ(Mo Kα)=0.71069 A, μ=13.1 cm -1 , F(000)=732, T= 294 K, R=0.039 for 2436 observed reflections with I>2σ(I)