Complexation of Molybdenum(VI) with Ethylenediaminediacetic Acid in Different Water + Methanol Solutions

Abstract

The stability constants for the reaction of molybdenum(VI) with ethylenediaminediacetic acid (EDDA) and protonation constants were determined at T ) 298 K and constant ionic strength of 0.1 mol · dm -3 sodium perchlorate in five different compositions of water + methanol by a combination of potentiometric and UV spectrophotometric methods. Stability and protonation constant variations versus the composition of different water + methanol mixtures have been reported, and their values have been calculated on the basis of the continuous variation method.

Calculation of the stability constants for the complex formation of dioxovanadium (V) with methyliminodiacetic acid in various H2O + CH3OH solutions using kamlet-abboud-taft equation

“…The antitumoral effects of vanadium can be evaluated by the determination of different parameters, such as cell proliferation, morphology and disruption of cellular architecture. [6][7][8] EXPERIMENTAL MIDA, 99 % ( Fig. 3 Vanadium plays a catalytic role in metalloenzyme systems, such as nitrogenase and haloperoxi-dases.…”

Complexation of molybdenum(VI) with methyliminodiacetic acid in different water + methanol solutions

“…[18][19][20][21] A literature survey showed that although there are only a few reports about the complexation of molybdenum(VI) with ethylenediamine-N,N′--diacetic acid (EDDA) in methanol-water 22,23 and complexation of tungsten(VI) 24 and molybdenum(VI) 25 with EDDA in propanol-water mixtures, no paper was found on stability constants data in different water + methanol solutions for the interaction of molybdenum(VI) with MIDA. It was seen from literature data [22][23][24][25] that the stability constants increased with decreasing polarity of alcohol-water mixtures, which confirms the pattern that was obtained in the current research. The concentration of Mo(VI) and MIDA and the kind of background electrolyte (c L = c M = 0.007 mol dm -3 , NaCl) in this research were different from that used in a previous work (c L = c M = 0.01 mol dm -3 , NaClO 4 ), 6 therefore the values of stability constants at 0 % methanol (I = 0.1 mol dm -3 ) in the two works were not the same (Table II).…”

Determination of Solvatochromic Regression Coefficients for the Molybdenum(VI) Complex with Ethylenediamine‐N,N′‐diacetic Acid by Using Kamlet‐Abboud‐Taft Equation

“…The pH-meter has a sensitivity of 0.01 units. 7 The hydrogen ion concentration was measured with a Metrohm combination electrode, model 6.0228.000. 7 ) was employed as a standard solution of hydrogen ion concentration.…”

“…7 Liquid junction potential correction and calibration of the glass electrode have been described previously. 7 Spectrophotometric measurements were performed with a Varian Cary 300 UV-Vis spectrophotometer with Pentium 4 computer between 260 nm and 270 nm in thermoregulated matched 10-mm quartz cells. 7 Experimental data 7 and measurement procedures have been reported in our previous papers.…”

“…Although several papers have been published about application of KAT equation, [1][2][3][4][5][6] there are no reports on the complexation of Mo(VI) with ethylenediamine-N,N'-diacetic acid (EDDA) in different aqueous solutions of methanol by using KAT equation. We have recently published a paper regarding the complexation of Mo(VI) with EDDA in different aqueous solutions of methanol 7 and presented part of the results at the 31st International Conference on Solution Chemistry (ICSC2009). 8 In the present paper, the contribution of KAT parameters for the molybdenum(VI) complex with EDDA was investigated for the first time.…”