1H NMR spectroscopic study of complexation of citalopram with β-cyclodextrin in aqueous solution

2007 ◽  
Vol 45 (3) ◽  
pp. 253-256 ◽  
Author(s):  
Syed Mashhood Ali ◽  
Arti Maheshwari ◽  
Bharat Inder Fozdar
Keyword(s):  
Aqueous Solution ◽  
Spectroscopic Study ◽  
1H Nmr

Infrared spectroscopic study of site symmetry effects for sulphite and sulphate anions in solid sodium sulphite oxidized by air oxygen

1985 ◽  
Vol 50 (12) ◽  
pp. 2715-2721
Author(s):  
Bohumil Hájek ◽  
Alexander Muck ◽  
Eva Šantavá
Keyword(s):  
Aqueous Solution ◽  
Spectroscopic Study ◽  
Sodium Sulphite ◽  
Site Symmetry ◽  
Infrared Spectroscopic Study ◽  
Infrared Spectroscopic

The mutual replacement of SO32- and SO42- anions was studied in Na2SO3.7 H2O crystals where sulphite is slowly oxidized to sulphate by air oxygen. In a series of Na2(SO3, SO4).7 H2O samples, the C1 or Cs site symmetry appears for the SO32- anion and the site symmetry of the SO42- anion is lowered gradually from Td through D2d or C3v to C1. The replacement was also studied for anhydrous sodium sulphite obtained by dehydration or by evaporation from aqueous solution. Despite the different structures of Na2SO3 and Na2SO4 crystals (C3i1 and D2h24, respectively), the favourable dimensions of the sterically different anions allow the SO42- ions, with their own symmetry Td, to be located in the C3 sites of the SO32- ions in Na2SO3.

Thermodynamic and spectroscopic study of Al 3+ interaction with glycine, l -cysteine and tranexamic acid in aqueous solution

2017 ◽  
Vol 230 ◽  
pp. 10-19 ◽  
Author(s):  
Paola Cardiano ◽  
Fausta Giacobello ◽  
Ottavia Giuffrè ◽  
Silvio Sammartano
Keyword(s):  
Aqueous Solution ◽  
Tranexamic Acid ◽  
Spectroscopic Study

scholarly journals SYNTHESIS, CHARACTERIZATION AND ANTIOXIDANT ACTIVITY OF 7-HYDROXY-3',4'-DIMETHOXYFLAVONE

2012 ◽  
Vol 12 (2) ◽  
pp. 146-151 ◽  
Author(s):  
Elfi Susanti VH ◽  
Sabirin Matsjeh ◽  
Tutik Dwi Wahyuningsih ◽  
Mustofa Mustofa ◽  
Tri Redjeki
Keyword(s):  
Aqueous Solution ◽  
Antioxidant Activity ◽  
Sodium Hydroxide ◽  
Spectral Data ◽  
1H Nmr ◽  
13C Nmr ◽  
Room Temperature ◽  
Antioxidant Activities ◽  
Oxidative Cyclization ◽  
Dpph Method

Synthesis of flavones and their derivatives has attracted considerable attention due to their significant pharmaceutical effects. 7-hydroxy-3',4'-dimethoxyflavone has been synthesized and its antioxidant activity has been investigated. Flavone was synthesized by oxidative cyclization of chalcone. 2',4'-dihydroxy-3,4-dimethoxychalcone was prepared by Claisen-Schmidt condensation of 2,4-dihydroxyacetophenones with 3,4-dimethoxybenzaldehydes in the presence of aqueous solution of sodium hydroxide and ethanol at room temperature. Oxidative cyclization of 2',4'-dihydroxy-3,4-dimethoxychalcone was done by using I2 catalyst in DMSO to form 7-hydroxy-3',4'-dimethoxyflavone. The synthesized compounds were characterized by means of their UV-Vis, IR, 1H-NMR and 13C-NMR spectral data. The compound was tested for their antioxidant activities by DPPH method.

Sign in / Sign up

Export Citation Format

Share Document