Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.252, 551-559, 1994
Hole-Burning of Proton(S) Subtracted 1,4-Dihydroxyanthraquinone - Mechanism and Low-Lying Electronic State(S) in Intramolecular Hydrogen-Bond(S) and Proton-Transfer System
Mono- and di-deprotonated 1,4-dihydroxy-anthraquinones are separately prepared with titration by sodium-ethylate and their properties of persistent spectral hole-burning in ethanol/methanol organic glass at cryogenic temperatures are investigated. Formations of zero-phonon holes are both detected though the burning yield is one (mono-) or two (di-) order(s) of magnitude smaller if compared with undeprotonated case. Spectral profiles of product and educt states indicated non-photochemical nature of the burning process for both. The role of intramolecular hydrogen bondings in hole burning and electronic states in anthraquinone derivatives is discussed.
Keywords:DERIVATIVES