Charge-transfer complexes of phenylephrine with nitrobenzene derivatives

El‐Mossalamy, E.H.

doi:10.1016/j.saa.2003.06.003

Cited by 22 publications

(7 citation statements)

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“…Table (7) gives the results obtained by application of proposed method and literature method for the determination of pp hydrochloride in pharmaceutical preparations. From the results shown in table (7) there is similarity in recovery , both methods done in room temperature in addition the present method is more sensitive , without buffer solution , simple and does not require solvent extraction.…”

Section: Nature Of Product and Reaction Mechanismmentioning

confidence: 55%

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Spectrophotometric Assay of Phenylephrine hydrochloride in Pharmaceutical Formulation with Alizarin Red sulphonate in Aqueous Solution

Al-Ghabsha¹,

Al-Delymi²

2013

J.Edu.Sci.

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A simple, rapid and sensitive spectrophotometric method for the determination of phenylephrine hydrochloride was developed. The method is based on the proton transfer reaction with alizarin red sulphonate in aqueous neutral solution to form a violet product showing a maximum absorbance at 530 nm with molar absorptivity of 14320 l.mol-1 .cm-1. The method is obeyed Beer's law over the concentration range (0.5-10) g.ml-1. The accuracy (average recovery) of the method is 99.72% and the precision (RSD) of the method is less than 1.5%. The method was successfully applied for the determination of phenylephrine hydrochloride in pharmaceutical formulation as eye drops and the results were in good agreement with the standard addition procedure.

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Section: Nature Of Product and Reaction Mechanismmentioning

confidence: 55%

“…The red product shows maximum absorption at 500 nm (6) . n-π CT-complex formation reaction has been used for the determination of pp spectrophotmetrically with picric acid and m-dinitrobenzene as π acceptors (7) . A new spectrophotometric method is proposed for determination of PP .…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric Assay of Phenylephrine hydrochloride in Pharmaceutical Formulation with Alizarin Red sulphonate in Aqueous Solution

Al-Ghabsha¹,

Al-Delymi²

2013

J.Edu.Sci.

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“…The charge‐transfer complex reduces the fluorescence emission of organic molecules and also plays an important role in the enhancement of charge transfer . Nitrobenzene derivatives have been known to form charge‐transfer complexes with phenylephrine and other organic molecules . Recent studies have found that adding a small volume fraction of nitrobenzene improves the morphology of PSCs for enhanced filled factor .…”

Section: Introductionmentioning

confidence: 99%

Formation of charge-transfer complexes significantly improves the performance of polymer solar cells based on PBDTTT-C-T: PC₇₁ BM

Yang

Shi

et al. 2014

Prog. Photovolt: Res. Appl.

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By adding appropriate proportions of nitrobenzene (C 6 H 5 NO 2 ) to the blended solution of poly{ [4,8-bis-(2-ethyl-hexylthiophene-5-yl]-phenyl-C71-butyric acid methyl ester (PBDTTT-C-T: PC 71 BM), we substantially improved the power conversion efficiency from the best reported value of 7.48-8.88%. Experiments and simulations show that nitrobenzene and PBDTTT-C-T form stable coplanar charge-transfer complexes through hydrogen bonds. Formation of the PBDTTT-C-T-C 6 H 5 NO 2 complex simultaneously increases the external quantum efficiency. The underlying mechanisms of increased external quantum efficiency are attributed to the following: (i) higher lowest unoccupied molecular orbital (LUMO) of PBDTTT-C-T-C 6 H 5 NO 2 for more efficient photoinduced electron transfer to the LUMO of PC 71 BM and (ii) efficient quenching of fluorescence in the active layers due to formation of the PBDTTT-C-T-C 6 H 5 NO 2 complex. This discovery clearly illustrates the potential of hydrogen-bonded complexes as a new route for efficient polymer-based photovoltaic devices.

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“…1,2 OH CHCH 2 NHCH 3 OH Phenylephrine Phenylephrine has been investigated spectrophotometrically using interactions with 1-nitroso-2-naphthol, 3 ninhydrin in sulfuric acid 4 and nitrobenzene derivates. 5 On the other hand, due to the presence of an amino group and a phenyl group in the molecule (pK a (−OH) = 8.9 and pK a (− + 2 NH −) = 10.1), 1 phenylephrine forms a complex with Fe 3+ (Fe 3+ /phenylephrine = 2:1). 6,7 However, there are no data in the literature about complexes of phenylephrine and the + 2 2 UO ion or other metal ions.…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric investigation of the uranyl-phenylephrine system

Pavun

Malešev

Veselinović

2007

JSCS

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Using spectrophotometric methods and pH-metric measurements, it was found that the uranyl ion and phenylephrine form a 1:2 complex in the pH region 2.50-4.25 with two absorption maxima at 314.2 nm and 340.6 nm. The thermodynamic stability constant at I = 0 and T = 298 K (room temperature) of the UO 2 (II)-phenylephrine complex, UO 2 (C 9 H 12 O 2 N) 2 , is log 0 2 β = 14.0 and G ∆ 2 = -79.6 kJ mol -1 . A linear dependence of the absorbance at 340.6 nm on the concentration of phenylephrine was obtained in the range from 0.0025 mol dm -3 to 0.0245 mol dm -3 using a solution of 0.025 mol dm -3 UO 2 (NO 3 ) 2 at pH = 3.90 and I = 0.075 mol dm -3 . The measurement error was 2.1 %.

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Charge-transfer complexes of phenylephrine with nitrobenzene derivatives

Cited by 22 publications

References 4 publications

Spectrophotometric Assay of Phenylephrine hydrochloride in Pharmaceutical Formulation with Alizarin Red sulphonate in Aqueous Solution

Spectrophotometric Assay of Phenylephrine hydrochloride in Pharmaceutical Formulation with Alizarin Red sulphonate in Aqueous Solution

Formation of charge-transfer complexes significantly improves the performance of polymer solar cells based on PBDTTT-C-T: PC₇₁ BM

Spectrophotometric investigation of the uranyl-phenylephrine system

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Charge-transfer complexes of phenylephrine with nitrobenzene derivatives

Cited by 22 publications

References 4 publications

Spectrophotometric Assay of Phenylephrine hydrochloride in Pharmaceutical Formulation with Alizarin Red sulphonate in Aqueous Solution

Spectrophotometric Assay of Phenylephrine hydrochloride in Pharmaceutical Formulation with Alizarin Red sulphonate in Aqueous Solution

Formation of charge-transfer complexes significantly improves the performance of polymer solar cells based on PBDTTT-C-T: PC71 BM

Spectrophotometric investigation of the uranyl-phenylephrine system

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Formation of charge-transfer complexes significantly improves the performance of polymer solar cells based on PBDTTT-C-T: PC₇₁ BM