Nitrido complexes infrared spectra

C. The characteristic infrared stretch of the ReN triple bond has not been found due to interference from Ph modes the ReCl stretch occurs at 323 cm (Nujol mull). Despite the color of the complex in the solid state and the yellow color of a CH2CI2 solution, no distinctive features appear in the visible region of the spectrum. The dipole moment of 1.6 (3) D is consistent with the X-ray crystal structure obtained elsewhere that reveals a distorted square pyramid with an apical nitrido ligand and mutually trans chloride ligands in the basal plane. The triphenylphosphine ligands are distorted toward the empty rhenium coordination site. 

---