Schwingungsspektren und Normalkoordinatenanalyse von N-Silylpyrrolen C4H4NSiX3 (X = Cl,CH3, H)

N-trichlorosilyl pyrrole (I) was prepared and, along with N-trimethylsilyl pyrrole (II), investigated by infrared and RAMAN spectroscopy. A normal coordinate analysis which was performed for pyrrole, I, II, and N-silyl pyrrole, suggests that no pure ?SiN stretching frequency”? occurs. This mode is mixed with ν NC₂ and δ(ring) as well as with v_s SiC₃ and v_s SiCl₃ and contributes to frequencies between ～400 and ～1100 cm^?1. The results are compared with quantum chemical calculations for pyrrole and II.