Infrared dip spectra of photochemical reaction products in a phenol/ammonia cluster: examination of intracluster hydrogen transfer

The vibrational transitions of the photochemical reaction products in phenol-(NH3)3 have been measured by infrared (IR) dip spectroscopy. Two sharp bands at ∼3200 cm−1 and a broad band in the region 2700∼3100 cm−1 are observed. The spectrum is clearly different from that of the cluster in S0, and also largely different from the IR spectrum of NH4+(NH3)2. This suggests that hydrogen transfer occurs in electronically excited phenol-(NH3)3. Evidence of hydrogen transfer has also been found in phenol-(NH3)4 based on the mass spectrum and the IR dip spectrum of the cluster.