Single crystal X-ray diffraction data were collected for all of the compounds using the following procedure: Crystals, of suitable quality, were identified, while immersed in Paratone-N oil, under a high-powered microscope and then subsequently cut to size. The freshly cut crystals were then scooped up by a MiTeGen plastic loop and placed into the goniometer of a Bruker Apex-II diffractometer, which utilizes a sealed source Mo Ka radiation (0.71073 Å ) for diffraction. A constant temperature of 200 K was maintained by cold nitrogen vapor that was obtained from boiling liquid N 2 . This cold nitrogen stream also served to preserve an inert environment by hardening the Paratone-N oil, forming a hard shell around the crystal such that the decomposition of the material was prevented.