Two-step laser excitation study on the proton transfer and anion formation in the intramolecularly hydrogen-bonded 7-hydroxy-1-indanone and related compounds

Evidence of coupled photoinduced proton transfer and intramolecular charge transfer reaction in para-N,N-dimethylamino orthohydroxy benzaldehyde: Spectroscopic and theoretical studies

“…That species may be the lowest energy intramolecularly hydrogen bonded closed conformer as seen in Scheme I. As was seen in case of OHBA molecule, the closed conformer of PDOHBA is stabilized in the ground state by strong intramolecular hydrogen bond between the hydrogen of hydroxyl (-OH) group and oxygen of aldehyde [50, [52][53][54]. Although the absorbance value is high at 330 nm, but a distinct peak is not observed for PDOHBA molecule.…”

“…In this work, we present photoinduced process in PDOHBA having donor and acceptor moiety suitable for excited state ICT reaction as well as the presence of six member IMHB ring capable for ESIPT reaction. The molecule PDOHBA consists of two basic units, one is the orthohydroxybenzaldehyde (OHBA) unit capable for ESIPT process [50][51][52][53][54][55][56] and the other is the 4-dimethylaminobenzaldehyde (DMABA) suitable for ICT reaction [57][58]. In PDOHBA, comparatively weak charge acceptor aldehyde group is present instead of strong charge acceptor ester group in DMASAME molecule.…”

Thermochemical studies on salicylaldehyde and salicylamide

“…The liquid salicylaldehyde (CAS: 90-02-8) and the crystalline salicylamide (CAS: 65-45-2), mass fractions 0.98 and 0.99, respectively, were purified before use in the calorimetric measurements. Salicylaldehyde has been treated according the procedure described in the literature [8], being collected from fractional distillation under reduced pressure (T = 347 K, p = 9 kPa); the purity of the sample was checked by g.l.c. (using an HP 4890 apparatus with a 15 m length column HP-5, diphenyl and dimethylpolysiloxane ratio 5:95, under a nitrogen pressure of 21 kPa with the oven temperature 423 K).…”

Inequivalence of substitution pairs in hydroxynaphthaldehyde: A theoretical measurement by intramolecular hydrogen bond strength, aromaticity, and excited‐state intramolecular proton transfer reaction

“…[13][14][15][16][17] Excited state proton transfer reaction has also been studied in molecular systems where naphthalene moiety is used as the chromophoric unit having the preexisting six member IMHB site. 4,5,17,20 But the spectral observation on ESIPT reaction for naphthalene chromophore systems is quite interesting and different from their corresponding benzene chromophoric counterparts due to the presence of two distinct inequivalent carbon pairs to which IMHB can be formed. Surprisingly it is found that the properties of these two inequivalent carbon pairs of naphthalene behave differently towards the excited state proton transfer phenomenon.…”