X-ray diffraction data collections for the compounds were performed on an Enraf-Nonius
Kappa-CCD diffractometer (95 mm CCD camera on κ-goniostat) using graphite monochromated
MoKα radiation (0.71073 Å), at room temperature. Data collection was carried out using the
COLLECT software [32] up to 50° in 2θ. Final unit cells parameters were based on 36671 reflections
for bismuth complex and 28720 for antimony complex, respectively. Integration and scaling of
the reflections, correction for Lorentz and polarization effects were performed with the HKLDENZO-SCALEPACK system of programs [33]. The structure of compound was solved by direct methods with SHELXS-97 [34]. The models were refined by full-matrix least squares on F2 using SHELXL-97 [34]. The program ORTEP-3 [35] was used for graphic representation and the program WINGX [36] to prepare material for publication. All H atoms were located by geometric considerations placed (C-H = 0.93–0.96 Å) and refined as riding with Uiso(H) = 1.5Ueq(C-methyl) or 1.2 Ueq (other). Crystallographic data for compound have been deposited with the Cambridge Crystallographic Data Center as Supplementary Publication No. CCDC 834105 and CCDC 834106. Copies of the data can be obtained, free of charge, on application to CCDC, 12 Union Road,Cambridge CH21EZ, UK (Fax: +44-1223-336-033 or E-Mail: deposit@ccdc.cam.ac.uk).