Specific solvent effect on the photophysical behavior of substituted chromones: A combined fluorescence, DFT and MD study

Water-soluble optical sensors: keys to detect aluminium in biological environment

“…Ideal photophysical and spectroscopic properties of chromones, including strong blue emission, presence of chromophoric C O and C C moieties, and small singlet-triplet energy gap have attracted a lot of attention in recent times. 57 Though many coumarin and chromone based aluminium sensors have been reported, their limited bioavailability prevents their use in the detection of aluminium in living systems. Recently, researchers are interested in developing probes by wisely grafting water-soluble moieties such as amino acids and polyalcohols to the fluorophores to exploit them in vivo .…”

Deciphering Spectroscopic and Structural Insights into the Photophysical Behavior of 2,2′-Dipyridylamine: An Efficient Environment Sensitive Fluorescence Probe

“…Fluorescence quantum yields (ϕ f ) of DPyA in different media were calculated by comparing the total fluorescence intensity under the whole fluorescence spectral range with that of 1,2-bis(di-2-pyridylaminomethyl)benzene as a standard (ϕ f s ) with the following equation, using adequate correction for the solvent refractive index (n). 20,21 i k j j j j y…”

“…In all cases, a 5 nm band-pass was used in the excitation and emission side. Fluorescence quantum yields (ϕ f ) of DPyA in different media were calculated by comparing the total fluorescence intensity under the whole fluorescence spectral range with that of 1,2-bis­(di-2-pyridylaminomethyl)­benzene as a standard (ϕ f s ) with the following equation, using adequate correction for the solvent refractive index ( n ). , A i and A s are the optical density of the sample and standard, respectively. The relative experimental error of the measured quantum yield was estimated within 10%.…”

“…The measured decay times were estimated to be within ±0.1 ns . Acceptability of the fitting analysis was checked by several statistical parameters like reduced chi-squared (χ 2 ) and the Durbin–Watson (DW) parameter values as well as by visual inspection of residual distribution . The average fluorescence lifetime (⟨τ⟩) was expressed in terms of fractional contribution ( f i ) of each decay time to the steady state intensity with eq . …”

Construction, characterization, and antimicrobial evaluation of the novel heteroannulated chromeno[2′′,3′′:6′,5′]pyrido[2′,3′‐d] [1,3] thiazolo[3,2‐a]pyrimidines

“…[15] Electronic, vibrational and NMR spectral analysis, photochemical, fluorescence, DFT, and MD were investigated for some chromone derivatives. [16][17][18][19][20] Substituted chromones are broadly used as building blocks for the synthesis of a wide range of heterocyclic compounds. [21][22][23][24] The presence of electron withdrawing substituents in position 3 of the chromone moiety activate the C-2 position toward nucleophilic reagents providing a diversity of products based on the functional group at position 3 as well as the used nucleophile.…”