For structure analysis, single crystals of the products, which are
known to be highly reactive in air, were rapidly stuck on top of a
glass filament using perfluorinated oil and mounted in an X-ray
diffractometer (Stoe IPDS II, equipped with a graphite monochromator,
a Mo KR radiation source, and an Oxford Cryostream LT
at 200 K) to avoid any oxidation or exposure to moisture. The
determination of the unit cell and the solution and refinement of
the crystal structure were performed using the SHELXL97 software.