New push–pull type dendritic stilbazolium dyes: synthesis, photophysical and electrochemical investigation

Mishra, Amaresh; Haram, N.S.

doi:10.1016/j.dyepig.2004.02.011

Cited by 23 publications

(14 citation statements)

References 34 publications

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“…In order to exclude the interference by redox-active bromide ion, hexafluorophosphate was used as the counter ion of A 1 instead of bromide ion. Similarly to the behaviors of previously reported analogous hemicyanine compounds [46,47], A 1 (PF 6 ) 2 exhibited an irreversible reduction peak with an onset reduction potential E onset (red) at À0.588 V vs. SCE (À0.347 V vs. normal hydrogen electrode, NHE), from which the energy of the lowest unoccupied molecular orbital (LUMO) was derived to be À4.152 eV (À0.347 vs. NHE) with respect to the vacuum energy level. By taking 0-0 transition energy E 00 (E 00 = 1240/l onset ) value as 1.84 eV (the onset absorption value is 675 nm for A 1 Br 2 in water), the energy of the highest occupied molecular orbital (HOMO) of the hemicyanine A 1 , E HOMO , was calculated to be À5.992 eV (+1.493 V vs. NHE) with respect to the vacuum energy level according to Eqs.…”

Section: Fig 5 Andsupporting

confidence: 78%

Photoelectrochemical properties of electrostatically self-assembled multilayer films formed by three bipolar hemicyanines and H4SiW12O40

Chen¹,

Gao²,

Zheng³

et al. 2013

Materials Research Bulletin

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Section: Fig 5 Andsupporting

confidence: 78%

Photoelectrochemical properties of electrostatically self-assembled multilayer films formed by three bipolar hemicyanines and H4SiW12O40

Chen¹,

Gao²,

Zheng³

et al. 2013

Materials Research Bulletin

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“…BP was synthesised by the reaction of 1,3,5-tris(bromomethyl)benzene with three equivalents of 4-picoline followed by Knoevenagel condensation with N , N -dimethylaminobenzaldehyde according to the procedure described in literature [7, 14]. …”

Section: Methodsmentioning

confidence: 99%

Factors affecting the TMPTA radical polymerization photoinitiated by phenyltrialkylborates paired with tri-cationic hemicyanine dye. Kinetic studies

Jędrzejewska

2013

Colloid Polym Sci

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This article introduces tri-cationic hemicyanine dye employed as a visible-light photoinitiator of acrylic monomers polymerization. This dye, in combination with borate anions, was found to be a very effective photoinitiating system. The kinetics of trimethylolpropane triacrylate polymerization was studied by a microcalorimetric method. The photoredox pair concentration, the co-initiator structure as well as the light intensity strongly affected the progress of the polymerization, leading, for example, to an increase in the polymerization rate and quantum yield of the process. The efficiency of these photoinitiators was discussed on the basis of the free energy change for electron transfer from a borate anion to an excited hemicyanine dye cation. The ∆Gel values were estimated for photoredox pairs containing a series of phenyltrialkylborate anions and one styrylpyridinium dye cation. The relationship between the rate of polymerization and the free energy of activation for electron transfer reaction gives the dependence predicted by the classical theory of electron transfer. The photoinitiating abilities of the selected novel photoredox pairs (BPB61, BPB7, BPB8, and BPB9) are comparable with the photoinitiating efficiency of commercially available photoinitiators.

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“…The C-5 hydroxyl group of 1 was selectively protected with the reaction of p-methoxybenzyl chloride (PMB-Cl) to afford 3 in 81% yield [9]. The C-7 hydroxyl group of 3 was converted to bromide 5 via mesylation of alcohol followed by bromination of the resulting mesylate 4 with the reaction of sodium bromide in DMF in 58% yield for two steps [10]. Arbuzov reaction of 5 with trimethyl phosphite in toluene at reflux temperature gave phosphonate 6 in 79% yield.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Tyrosinase Inhibitory Kojic Acid Derivative

Lee¹,

Park

Kim

et al. 2006

Archiv der Pharmazie

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Kojic acid derivative 2 was synthesized by joining two pyrone rings through an ethylene linkage by Horner-Emmons reaction of phosphonate 6 with aldehyde 7. The intermediates 6 and 7 were derived from kojic acid. The tyrosinase inhibitory activity of 2 was about 8 times more potent (IC(50) = 3.63 microM) than that of kojic acid (IC(50) = 30.61 microM). Compound 2 also exhibited potent melanin synthesis inhibitory activity (19.53% inhibition at 5 mug) indicating that the connection of two pyrone rings of kojic acid through a suitable linker can be an useful strategy for identification of potent tyrosinase inhibitors.

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New push–pull type dendritic stilbazolium dyes: synthesis, photophysical and electrochemical investigation

Cited by 23 publications

References 34 publications

Photoelectrochemical properties of electrostatically self-assembled multilayer films formed by three bipolar hemicyanines and H4SiW12O40

Photoelectrochemical properties of electrostatically self-assembled multilayer films formed by three bipolar hemicyanines and H4SiW12O40

Factors affecting the TMPTA radical polymerization photoinitiated by phenyltrialkylborates paired with tri-cationic hemicyanine dye. Kinetic studies

Synthesis of Tyrosinase Inhibitory Kojic Acid Derivative

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