Polymorphism, Hydrogen Bond Properties, and Vibrational Structure of 1H-Pyrrolo[3,2-h]Quinoline Dimers

Figure 6

(a) Raman spectrum of the monomer in Ar matrix at 15 K; (b) simulated monomer spectrum; (c) dimeric, polycrystalline PQ, measured at 293 K; results of calculations performed for the planar (d) and twisted (e) dimer. The scaling factor of 0.9682 was used in calculations.