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Audran G, Bosco L, Brémond P, Butscher T, Franconi JM, Marque SRA, Mellet P, Parzy E, Santelli M, Thiaudière E. The β-phosphorus hyperfine coupling constant in nitroxide: part 3: titration of water by electron paramagnetic resonance. Org Biomol Chem 2015; 13:11393-400. [PMID: 26395177 DOI: 10.1039/c5ob01867f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recently, we showed that the phosphorus hyperfine coupling constant aPβ of persistent cyclic nitroxides decreased with the normalized polarity Reichardt's constant E. Thus, we investigated the changes in aPβ in binary mixtures of solvents. The sensitivity of aPβ to the solvent was high enough to allow us to perform water titration in THF, 1,4-dioxane, and acetonitrile by EPR. Accuracies of a few percent were achieved.
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Affiliation(s)
- Gérard Audran
- Aix-Marseille Université, CNRS-UMR 7273, ICR, case 541, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France.
| | - Lionel Bosco
- Aix-Marseille Université, CNRS-UMR 7273, ICR, case 541, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France.
| | - Paul Brémond
- Aix-Marseille Université, CNRS-UMR 7273, ICR, case 541, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France.
| | - Teddy Butscher
- Aix-Marseille Université, CNRS-UMR 7273, ICR, case 541, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France.
| | - Jean-Michel Franconi
- CRMSB, CNRS-UMR-5536, Université Victor Segalen Bordeaux 2, 146 rue Léo Saignat, Case 93, 33076 Bordeaux Cedex, France
| | - Sylvain R A Marque
- Aix-Marseille Université, CNRS-UMR 7273, ICR, case 541, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France. and N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, Pr. Lavrentjeva 9, 630090 Novosibirsk, Russia
| | - Philippe Mellet
- CRMSB, CNRS-UMR-5536, Université Victor Segalen Bordeaux 2, 146 rue Léo Saignat, Case 93, 33076 Bordeaux Cedex, France and INSERM, 146 rue Léo Saignat, Case 93, 33076 Bordeaux Cedex, France
| | - Elodie Parzy
- CRMSB, CNRS-UMR-5536, Université Victor Segalen Bordeaux 2, 146 rue Léo Saignat, Case 93, 33076 Bordeaux Cedex, France
| | - Maurice Santelli
- Aix-Marseille Université, CNRS-UMR 7273, ICR, case 541, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France.
| | - Eric Thiaudière
- CRMSB, CNRS-UMR-5536, Université Victor Segalen Bordeaux 2, 146 rue Léo Saignat, Case 93, 33076 Bordeaux Cedex, France
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Taha A, Farag AAM, Ammar AH, Ahmed HM. Structural, molecular orbital and optical characterizations of solvatochromic mixed ligand copper(II) complex of 5,5-Dimethyl cyclohexanate 1,3-dione and N,N,N',N'N″-pentamethyldiethylenetriamine. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 122:512-520. [PMID: 24334014 DOI: 10.1016/j.saa.2013.11.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 11/02/2013] [Accepted: 11/07/2013] [Indexed: 06/03/2023]
Abstract
In this work, a new solvatochromic mononuclear mixed ligand complex with the formula, Cu(DMCHD)(Me5dien)NO3 (where, DMCHD=5,5-Dimethyl cyclohexanate 1,3-dione and (Me5dien)=N,N,N',N'N″-pentamethyldiethylenetriamine was synthesized and characterized by analytical, spectral, magnetic, molar conductance, thermal gravimetric analysis (TGA), X-ray diffraction (XRD) and transmission electron microscope (TEM) measurements. The formation constant-value for copper (II)-DMCHD was found to be much lower than the expected for similar β-diketones, revealing monobasic unidentate nature of this ligand. The d-d absorption bands of the prepared complex exhibit a color changes in various solvent (solvatochromic). Specific and non-specific interactions of solvent molecules with the complex were investigated using Multi Parametric Linear Regression Analysis (MLRA). Structural parameters of the free ligands and their Cu (II) - complex were calculated on the basis of semi-empirical PM3 level and compared with the experimental data. The crystallite size and morphology of Cu(DMCHD)(Me5dien)NO3 were examined using XRD analysis and TEM, revealing that the complex is well crystalline and correspond to the monoclinic crystal structure. The lattice strain and mean crystallite size were estimated by Williamson-Hall (W-H) plot using X-ray diffraction data. The main important absorption parameters such as extinction molar coefficient, oscillator strength and electric dipole strength of the principal optical transitions in the UV-Vis region were calculated. The analysis of absorption coefficient near the fundamental absorption edge reveals that the optical band gaps are direct allowed transitions with values of 2.78 eV and 3.59 eV. The present copper (II) complex was screened for its antimicrobial activity against Staphylococcus Aureus and Bacillus Subtilis as Gram-positive bacteria, Escherichia Coli and Salmonella Typhimurium as Gram-negative bacteria and Candida Albicans as fungus strain.
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Affiliation(s)
- A Taha
- Chemistry Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt
| | - A A M Farag
- Thin Film Laboratory, Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt.
| | - A H Ammar
- Thin Film Laboratory, Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt; Physics Department, Faculty of Science and Arts, Al-Ola, Taibah University, Saudi Arabia
| | - H M Ahmed
- Chemistry Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt
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Broda A, Stroka J, Galus Z. The free energy of transfer of Pb(II) ion and electrode kinetics of the Pb(II)/Pb(Hg) system in dimethyl sulfoxide (DMSO) and DMSO-water mixtures. Electrochim Acta 1983. [DOI: 10.1016/0013-4686(83)85153-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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PMR study of the composition of the first coordination sphere of Co(II) and Ni(II) ions in mixed solvents. J STRUCT CHEM+ 1981. [DOI: 10.1007/bf00746377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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Matveev VV. PMR study of mixed complexes of Co(II) in aqueous pyridine and aqueous acetonitrile solutions. J STRUCT CHEM+ 1981. [DOI: 10.1007/bf00746378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Puchalska D, Kamieńska-Piotrowicz E, Libuś W. Ionic association equilibria in the dimethyl sulphoxide solutions of Mn(CF3COO)2, Co(CF3COO)2 and Ni(CF3COO)2. Electrochim Acta 1979. [DOI: 10.1016/0013-4686(79)87023-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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