Comment on "Ground-state triple proton transfer in 7-hydroxyquinoline, part 4. Observation in room-temperature methanol and aqueous solutions."

Article Abstract:

A. Bohra et al claim that different 7-hydroxyquinoline (HQ) self-associated forms are present in room-temperature methanol solution. Moreover, strong assemblage effects were observed in both polar and nonpolar solvents. However, a series of excitation spectrum measurements revealed that the formation of various 7HQ self-associated forms in room-temperature methanol solution is but the product of a spectral distortion arising from the use of conventional fluorimeters. An excited-state proton-transfer dynamics study supports the existence of 7HQ species only in nonpolar events.

Methanol, Protons, Excited state chemistry

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Conjugated dual hydrogen-bond mediating proton-transfer reaction in 3-hydroxyisoquinoline

Article Abstract:

The proton-transfer tautomerism in the ground and excited states of 3-hydroxyisoquinoline induced by the conjugated dual hydrogen-bonding (CDHB) effect has been investigated. The results showed the influence of CDHB formation in fine-tuning the ground state equilibrium to the keto form. In the excited state, the enol CDHB complexes undergo rapid proton-transfer reaction which results in keto emission. The reaction has been elucidated by a deactivation mechanism induced by vibrations of low-frequency hydrogen-bonding modes caused by the CDHB.

Hydrogen bonding, Hydrogen bonds

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Photoinduced double proton tautomerism in 4-azabenzimidazole

Article Abstract:

Issues concerning the use of theoretical calculations, absorption and emission to investigate the hydrogen-bonded complexes of 4-azabenzimidazole are discussed.

Research and Development in the Physical, Engineering, and Life Sciences, Chemistry, Analysis, Chemical research, Chemistry, Physical and theoretical, Physical chemistry

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