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The association constants of Na+ with the macrocycles of [12]crown-4, [15]crown-5, [18]crown-6, Diaza[18]crown-6 and PEG 600 were estimated in dioxane / water (50/50) using a Na2+ ion selective electrode with the relationship, 1/Ka... more
The association constants of Na+ with the macrocycles of [12]crown-4, [15]crown-5, [18]crown-6, Diaza[18]crown-6 and PEG 600 were estimated in dioxane / water (50/50) using a Na2+ ion selective electrode with the relationship, 1/Ka [Lo]n+m-1 = (1-nP′)n (1-mP′)m / P′ where, P’ is the mole fraction of the complexed cation.
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The solid and stable Na+ and Ba2+complexes of 7,16-Dibenzyl-4,7,10,13tetraoxa-7,16-diazacyclooctadecane; 7,16-Dihexyl-4,7,10,13-tetraoxa-7,16-diazacyclo octadecane; 7,16-Dihep-tyl-4,7,10,13-tetraoxa-7,16-diazacyclootadecane,... more
The solid and stable Na+ and Ba2+complexes of 7,16-Dibenzyl-4,7,10,13tetraoxa-7,16-diazacyclooctadecane; 7,16-Dihexyl-4,7,10,13-tetraoxa-7,16-diazacyclo octadecane; 7,16-Dihep-tyl-4,7,10,13-tetraoxa-7,16-diazacyclootadecane, 7,16-Dioctyl4,7,10,13-tetraoxa-7,16-diazacycloctadecane; 7,16-Dinon yl-4,7,10,13-tetraoxa-7,16diazacyclooctadecane; 7,16-Didodecyl-4,7,10,13-tetraoxa-7,16-diazacyclooctadecane were prepared. The complexes were investigated using Elemental Analysis, IR, 1H NMR, 13C NMR spectroscopy. 1H and 13C chemical shifts observed in complexes are discussed in terms of conformational changes on the macrocycles.
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... At the same time, the system was connected to a thermostatted water-bath (25 \± 0.05°C) and a conductivity cell (Cole Parmer 19050–66) with a conductometer (Suntex SC-170 Model). ... Acta , 72: 619–629. View all references. Treatment... more
... At the same time, the system was connected to a thermostatted water-bath (25 \± 0.05°C) and a conductivity cell (Cole Parmer 19050–66) with a conductometer (Suntex SC-170 Model). ... Acta , 72: 619–629. View all references. Treatment of Cu, Ni, Mn, and Zn Complexes. ...
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This paper deals with the study of different degrees of association constants of Na+ and K+ ions with macrocycles of [12]crown-4, [15]crown-5, [18]crown-6, and Diaza[18]crown-6 in (1:1)dioxane/water mixture using the sodium and potassium... more
This paper deals with the study of different degrees of association constants of Na+ and K+ ions with macrocycles of [12]crown-4, [15]crown-5, [18]crown-6, and Diaza[18]crown-6 in (1:1)dioxane/water mixture using the sodium and potassium ion selective electrodes (ISE). The gas phase molecular mechanical and quantum chemical calculations of [18]crown-6 and diaza[18]crown-6 were performed at MM+, AM1, MINDO/3, HF/6-31G(d), and B3LYP/6-31G(d) levels