Lowest triplet (n,π~?) state of 2-cyclohexen-1-one: Characterization by cavity ringdown spectroscopy and quantum-chemical calculations

摘要

The cavity ringdown (CRD) absorption spectrum of 2-cyclohexen-1-one (2CHO) was recorded over the range 401.5-410.5 nm in a room-temperature gas cell. The very weak band system (ε ≤ 0.1 M~(-1) cm~(-1)) in this spectral region is due to the T_1(n, π~*) ← S_0 electronic transition. The 0_0~0 origin band was assigned to the feature observed at 24 558.8±0.3 cm~(-1). We have assigned 46 vibronic transitions in a region extending from -200 to +350 cm~(-1) relative to the origin band. For the majority of these transitions, we have made corresponding assignments in the spectrum of the deuterated derivative 2CHO-2,6,6-d3. From the assignments, we determined fundamental frequencies for several vibrational modes in the T1(n, π~?) excited state of 2CHO, including the lowest ring-twisting (99.6 cm~(-1)) and ring-bending (262.2 cm~(-1)) modes. These values compare to fundamentals of 122.2 cm~(-1) and 251.9 cm~(-1), respectively, determined previously for the isoconfigurational S1(n, π~?) excited state of 2CHO and 99 cm~(-1) and 248 cm~(-1), respectively, for the S_0 ground state. With the aid of quantum-mechanical calculations, we have also ascertained descriptions for these two modes, thereby resolving ambiguities appearing in the previous literature. The ring-twisting mode (ν39) contains a significant contribution from O=C-C=C torsion, whereas the ring-bending mode (ν38 in the ground state) involves mainly the motion of C-5 with respect to the plane containing the other heavy atoms. The CRD spectroscopic data for the T_1(n, π~?) state have allowed us to benchmark several computational methods for treating excited states, including time-dependent density functional theory and an equation-of-motion coupled cluster method. In turn, the computational results provide an explanation for observed differences in the T1(n, π~?) vs. S1(n, π~?) ring frequencies.