The specific and nonspecific solvatochromic behavior of Sudan dyes in different solvents

2015 ◽  
Vol 93 (6) ◽  
pp. 639-647 ◽  
Author(s):  
M.S. Zakerhamidi ◽  
S.M. Seyed Ahmadian ◽  
R. Kian
Keyword(s):  
Fluorescence Spectra ◽  
Room Temperature ◽  
Molecular Configuration ◽  
Sudan Dyes ◽  
Polar Solvents ◽  
Sudan Black B ◽  
Sudan Iv ◽  
Sudan Iii ◽  
Linear Solvation Energy ◽  
Solute Interactions

Absorption and fluorescence spectra of some Sudan dyes (Sudan III, Sudan IV, and Sudan Black B) were recorded in various solvents in the range of 300–800 nm at room temperature. The solvatochromic behavior of these substances and their solvent–solute interactions were analyzed by means of the linear solvation energy relationship concept suggested by Kamlet and Taft. The obtained results express the effect of solvation on the tautomerism and molecular configuration (geometry) of Sudan dyes in solvent media. Furthermore, analysis of solvent–solute interactions suggests different forms of resonance structures of Sudan dyes in polar and low-polar solvents.

Ultraviolet Absorption and Fluorescence Studies of 1-Methyl-2(1H)-Pyridinimine and Derivative in Polar and Non-Polar Solvents

2000 ◽  
Vol 53 (12) ◽  
pp. 951 ◽  
Author(s):  
Hassimi Traore ◽  
Michael Saunders ◽  
Scott Blasiman
Keyword(s):  
Fluorescence Spectra ◽  
Room Temperature ◽  
Potential Surface ◽  
Polar Solvents ◽  
Potential Surfaces ◽  
Fluorescence Studies ◽  
Pyridinium Cation ◽  
Vibronic Interactions ◽  
State Potential ◽  
Solute Interactions

The ultraviolet (u.v.) and fluorescence spectra and relative fluorescence intensities of 1-methyl-2(1H)-pyridinimine (1-MIP) and 1,2-dimethylpyridinimine (2-MIP) were measured in several solvents at room temperature. The solvents’ effect on the absorption and fluorescence spectra of MIP indicates that the ππ* transition shifts to higher energies (shorter wavelengths) are due to solvents’ interactions and the formation of the pyridinium cation. One major difference in the u.v. and fluorescence spectra is the small relative intensity in non-polar solvents. This was attributed to the proximity effect of ππ* and nπ* states which can lead to vibronic interactions, and to distortions of the excited-state potential surfaces. In polar solvents, however, these two states are shifted in energy due to solvent–solute interactions, which decrease the energy of the potential surface.

Solvatochromism Effects on the Photo-Physical Behavior of Two Triazole Compounds

2016 ◽  
Vol 230 (11) ◽  
Author(s):  
Roshanak Kian ◽  
Seyed  Masoud Seyed Ahmadian ◽  
Mohammad  Sadegh Zakerhamidi ◽  
Ghader Babaie ◽  
Parviz Nesari
Keyword(s):  
Excited States ◽  
Room Temperature ◽  
Dipole Moments ◽  
Triazole Ring ◽  
Biological Applications ◽  
Physical Behavior ◽  
Energy Relationships ◽  
Linear Solvation Energy ◽  
Solute Interactions ◽  
Molecular Skeleton

AbstractDiverse biological applications of triazole molecules, makes study of these compounds intriguing. Since, the solvent effect causes different behavior in these compounds, a quantitative study of solvent effects on photo-physical properties of two triazole compounds, with similar molecular skeleton and various substituent groups on triazole ring were studied, at room temperature. The solute's photo-physical behavior strongly depends on the solute and solvent's nature, along with the solvent-solute interactions. In order to understand the effect of intermolecular interactions on spectral behaviors of these materials, and to conceive the nature and extend of solvent-solute interactions, the spectral variations were analyzed via the linear solvation energy relationships concept, suggested by Kamlet and Taft. In addition, by means of solvatochromic method, ground and excited states dipole moments as well as dipole moment variations, from ground to excited states, were calculated, in different media.

Fluorescence of Cyclic Adducts of Fullerene

1994 ◽  
Vol 359 ◽  
Author(s):  
Tsung-I Lin ◽  
Syh-Kun Lin ◽  
Lung-Lin Shiu ◽  
Kuo-Ming Chien ◽  
Tien-Yau Luh
Keyword(s):  
Spectral Properties ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Parent Compound ◽  
Molar Absorptivity ◽  
Absorption Bands ◽  
Polar Solvents ◽  
Peak Broadening ◽  
Stokes Shifts ◽  
Cyclic Adducts

ABSTRACTFive cyclic adducts C60C4H6, C60C5H6, C60NHCO2, C60NCO2Et, and C60CHCO2Et have been synthesized and their absorption and fluorescence spectral properties investigated and compared with those of the parent. Breaking the structural symmetry of C60 apparently resulted in enhancing the quantum yield two to three-folds in some adducts and thus made fluorescence much easier to be measured at room temperature. New absorption bands and altered fluorescence spectra were observed in the adducts. The Stokes' shifts of the adducts were small, about 4-5 nrm, compared to 68 nm for the parent compound. All the adducts exhibited a single fluorescence lifetime about the same as C60 (ca. 1.3 ns). Aliphatic solvents had little influence on the absorption or fluorescence spectral profile except on the molar absorptivity whereas aromatic and polar solvents strongly interacted with the adducts causing a peak broadening effect.

Fluorescence Quantum Yields of 2-Substituted 3-Methylquinoxalines in Liquid Solutions at Room Temperature

1991 ◽  
Vol 46 (8) ◽  
pp. 700-702
Author(s):  
A. Kawski ◽  
K. Nowaczyk ◽  
B. Kuklinski
Keyword(s):  
Quantum Yield ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Atomic Weight ◽  
Modulation Method ◽  
Quantum Yields ◽  
Strong Decrease ◽  
Polar Solvents ◽  
Fluorescence Quantum Yields ◽  
Liquid Solutions

AbstractA sensitivity modulation method was employed to measure the fluorescence spectra and quantum yields of weakly fluorescent 2-substituted (NH2, O, OCH3, CI, Br) 3-methylquinoxalines in n-hexane and methanol at room temperature. A strong decrease in the quantum yield with increasing atomic weight of the substituents was observed in n-hexane. In polar solvents, the CI substituent is the strongest quencher although its atomic weight is 2.254 times smaller than that of Br

Discovery of THICZs as Chemical Sensors: Synthesis, Spectrophotometric,Voltammetric and DFT Studies

2019 ◽  
Vol 09 ◽  
Author(s):  
Mardia T. El Sayed ◽  
Ibrahim H.I. Habib ◽  
Nermien M. Sabry ◽  
Sergey A. Pisarev ◽  
Mohamed El-Naggar ◽  
...  
Keyword(s):  
Electrochemical Behaviour ◽  
Molecular Size ◽  
Active Species ◽  
Carbon Paste ◽  
Reversible Redox ◽  
Energy Relationships ◽  
Linear Solvation Energy ◽  
Solute Interactions ◽  
Homo Lumo ◽  
Paste Electrode

Absorption spectra of tetrahydro[3,2-b]indolo-carbazoles (THICZs) with various molecular size and alkyl tails have been recorded in various solvents in the range between 200 to 600 nm. The photo physical behaviour of dissolved THICZs depends on the nature of its environment. The solvatochromic behaviours of THICZs and solvent solute interactions can be analysed by means of linear solvation energy relationships concept proposed by Kamlet and Taft. Compound 4 show excellent properties for sensing small molecules. The electrochemical behaviour of some THICZs was investigated at carbon paste electrode where two electrode reactions were involved, irreversible oxidation-one electron transfer and quasi-reversible redox reactions forming phenolic followed by quinolone moiety electro active species. The DFT-calculated molecular orbital energies (B3LYP/6-31G) and HOMO-LUMO gaps for some presented indolocarbazoles have been performed.

Infrared spectra of N-acetyl-L-α-amino-acid N'-methylamides with aliphatic side chains in non-polar solvents

1981 ◽  
Vol 46 (3) ◽  
pp. 772-780 ◽  
Author(s):  
Jorga Smolíková ◽  
Jan Pospíšek ◽  
Karel Bláha
Keyword(s):  
Amino Acid ◽  
Conformational Changes ◽  
Infrared Spectra ◽  
Room Temperature ◽  
Side Chains ◽  
Polar Solvents

Infrared spectra of the L-alanine (I), L-leucine (II), L-valine (III) and L-tert-leucine (IV) N-acetyl N'-methylamides were measured. Amides I-IV are not self associated in tetrachlormethane in the concentration 2 . 10-5 mol l-1 at room temperature and in tetrachloroethylene in the concentration 1.5 . 10-4 mol l-1 at temperatures above 65° C. True conformational changes are observable only with the least flexible amide IV which exists at room temperature in a C5 conformation. This conformational type is also highly populated in the valine derivative III, but is less important in the alanine and leucine derivatives I and II in which the intramolecularly bonded C7 and the distorted hydrogen-nonbonded conformations contribute seriously.

Room-temperature NaI/H2O compression icing: solute–solute interactions

2017 ◽  
Vol 19 (39) ◽  
pp. 26645-26650 ◽  
Author(s):  
Qingxin Zeng ◽  
Chuang Yao ◽  
Kai Wang ◽  
Chang Q. Sun ◽  
Bo Zou
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Bond Energy ◽  
Room Temperature ◽  
Solute Concentration ◽  
Solute Interaction ◽  
Solute Interactions

H–O bond energy governs the PCx for Na/H2O liquid–VI–VII phase transition. Solute concentration affects the path of phase transitions differently with the solute type. Solute–solute interaction lessens the PC2 sensitivity to compression. The PC1 goes along the liquid–VI boundary till the triple phase joint.

scholarly journals Spectral Properties of Hybrid of Rhodamine (6G) Dyes Doped Epoxy Resin Dissolved in Chloroform

2019 ◽  
Vol 16 (3(Suppl.)) ◽  
pp. 0764 ◽  
Author(s):  
Al-Hamdani Et al.
Keyword(s):  
Epoxy Resin ◽  
Quantum Efficiency ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Rhodamine 6G ◽  
Energy Gap ◽  
Radiative Lifetime ◽  
Stokes Shift ◽  
Fluorescence Emission ◽  
Absorption And Fluorescence Spectra

            The research is dealing with the absorption and fluorescence spectra for the hybrid of  an Epoxy Resin doped with organic dye Rhodamine (R6G) of different concentrations (5*10-6, 5*10-5, 1*10-5, 1*10-4, 5*10-4) Mol/ℓ at room temperature. The Quantum efficiency Qfm, the rate of fluorescence emission Kfm (s-1), the non-radiative lifetime τfm (s), fluorescence lifetime τf and the Stokes shift were calculated. Also the energy gap (Eg) for each dye concentration was evaluated. The results showed that the maximum quantum efficiency 62 % and maximum stokes shift 96 nm was obtained in dye concentration 5*10-6 and 1*10-4. The energy gap ranges between 1.066 eV to 1.128 eV depending proportionally on the dye concentrations.

Synthesis and characterization of new cardo poly(ether amide)s containing 9(10H)-anthrone units

2020 ◽  
Vol 32 (9) ◽  
pp. 1001-1009
Author(s):  
Yi-Sheng Luo ◽  
Qiu-Ying Wang ◽  
Xue-Chun Mao ◽  
Shou-Ri Sheng
Keyword(s):  
Room Temperature ◽  
Dicarboxylic Acids ◽  
Synthesis And Characterization ◽  
Aromatic Diamine ◽  
Polar Solvents ◽  
Glass Transition Temperatures ◽  
Flexible Films ◽  
Step Procedure ◽  
Aromatic Dicarboxylic Acids

A new aromatic diamine, 10,10-bis[4-(4-aminophenoxy)phenyl]-9(10 H)-anthrone (BAPA) has been synthesized from anthrone via three-step procedure. Direct phosphorylation polycondensation of BAPA with various aromatic dicarboxylic acids produced a series of cardo poly(ether amide)s with inherent viscosities of 0.97–1.29 dL g−1. All the polymers were readily soluble in polar solvents such as N-methyl-2-pyrrolidone, N, N-dimethylacetamide (DMAc), and pyridine at room temperature, and afforded transparent, strong, and flexible films upon casting from DMAc solvent. The resulting poly(ether amide)s had glass transition temperatures of 254–316°C, 10% weight loss temperatures of 495–524°C, and char yields of 55–70% at 800°C in nitrogen. These polymers were amorphous and their films exhibited tensile strengths of 81.6–104.7 MPa, tensile moduli of 1.8–2.4 GPa, and elongations at break of 8–15%.

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