Cystal data C29H34Cl2N2O2Ru Z=4 Mr=614.55 Dx=1.429 Mg m-3 Monoclinic, P21/c Mo Ka radiation a=13.2709 (9) Å Cell parameters from 16009 reflections b=18.5843 (9) Å q=1.7-28.0° c=12.7436 (8) Å m=0.76 mm-1 b=114.639 (5)° T=296 (2) K V=2856.8 (3) Å3 Prism, brown

Data collection STOE IPDS 2 diffractomer 2277 reflections with I> 2σ(I) w–scans Rint=0.091 Absorption correction: integration θmax=25.0° Tmin=0.782, Tmax= 0.873 h=-15 → 15 18190 measured reflections k=-21→21 5028 independent reflections l=-15 → 13

Refinement Refinement on F2 H atoms constrained to parent site R[F2> 2s(F2)]=0.054 Calculated weights w=1/[σ2(Fo2) + (0.0502P)2] where P=(Fo2 + 2Fc2)/3 wR(F2)=0.123 (Δ/σ)max=0.001 S=0.82 Δρmax=0.79 e Å-1 5028 reflections Δρmin=-0.42 e Å-1 301 parameters Extinction correction: none

Table 1: Crystallographic data and structure refinement for 2a.