Conductance Studies on Complex Formation Between Aza-18-Crown-6 with Ag+, Hg2+ and Pb2+ Cations in DMSO–H2O Binary Solutions

Rounaghi, G. H.; Soleamani, A.; Sanavi, K. R.

doi:10.1007/s10847-005-9035-4

Cited by 25 publications

(11 citation statements)

References 13 publications

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“…complex at each temperature was obtained from variation of molar conductance as a function of [L] t /[M] t molar ratios using a GENPLOT computer program [23]. The details of calculation of the stability constants of complexes by the conductometric method have been described elsewhere [21][22][23][24][25]. The values of the stability constant (logK f ) for (PhA15C5ÁUO 2 ) 2?…”

Section: Conductance Studiesmentioning

confidence: 99%

Solvent influence upon complexation of N-phenylaza-15-crown-5 with UO2 2+ cation in binary mixed non-aqueous solvents

Rounaghi

Nouri

Tarahomi

2011

J Incl Phenom Macrocycl Chem

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The complexation reaction of N-phenylaza-15-crown-5 (PhA15C5) with UO 2 2? cation was studied in acetonitrile-methanol (AN-MeOH), acetonitrile-butanol (ANBuOH), acetonitrile-dimethylformamide (AN-DMF) and methanol-propylencarbonate (MeOH-PC) binary solutions, at different temperatures by conductometry method. The conductance data show that the stoichiometry of the complex formed between PhA15C5 with UO 2 2? cation in most cases is 1:1 [M:L], but in some solvent systems a 1:2 [M:L 2 ] complex is formed in solutions. The results revealed that, the stability constant of (PhA15C5ÁUO 2 ) 2? complex in the binary mixed solvents varies in the order: AN-BuOH[ANMeOH[AN-DMF. In the case of the pure organic solvents, the sequence of the stability of the complex changes as: AN[PC[BuOH[DMF. A non-linear relationship was observed for changes of logK f of (PhA15C5ÁUO 2 ) 2? complex versus the composition of the binary mixed solvents. The corresponding standard thermodynamic parameters (DH c°, DS c°) were obtained from temperature dependence of the stability constant. The results show that the values and also the sign of these parameters are influenced by the nature and composition of the mixed solvents.

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Section: Conductance Studiesmentioning

confidence: 99%

Solvent influence upon complexation of N-phenylaza-15-crown-5 with UO2 2+ cation in binary mixed non-aqueous solvents

Rounaghi

Nouri

Tarahomi

2011

J Incl Phenom Macrocycl Chem

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“…The extraction temperature also plays important role in metal crown ether interaction. Several experimental [7][8][9] have been taken to study the influence of temperatures on stability constant of metal crown ether complexes. It is reported that as the extraction temperatures increase, the stability constant of crown ether alkaline earth complexes reduce.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study on the Extraction of Alkaline Earth Salts by 18-Crown-6: Roles of Counterions, Solvent Types and Extraction Temperatures

Hadisaputra¹,

Canaval²,

Pranowo³

et al. 2014

Indones. J. Chem.

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“…Iodine has been found to form with many compounds charge transfer complexes whose properties have been thoroughly studied [14][15][16][17][18]. Various physico-chemical techniques such as: spectrophotometry [19,20], NMR spectrometry [21], polarography [22,23], potentiometry [24] and conductometry [25][26][27] have been used to study the complex formation between macrocyclic polyethers (crown ethers) and various metal cations in solutions. Following our previous report on the spectroscopic study of charge transfer complexes of crown ethers with iodine in different halocarbone solvents [9,10], in this paper we report here the results of a spectrophotometric investigation of the kinetics of complex formation of iodine with 15-crown-5 (15C5), dicyclohexyl-18-crown-6 (DC18C6), benzo-18-crown-6 (B18C6) and dibenzo-24-crown-8 (DB24C8) in chloroform, dichloromethane and 1,2-dichloroethane solutions.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of Charge Transfer Complexes of Iodine With Some Crown Ethers in Nonaqueous Solvents

Alizadeh

Roomiani

2012

J. Chil. Chem. Soc.

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Charge-transfer complexation of iodine with 15-crown-5(15C5), dicyclohexyl-18-crown-6 (DC18C6), benzo-18-crown-6 (B18C6) and dibenzo-24-crown-8 (DB24C8) has been studied in chloroform (CHCl 3 ), Dichloromethane (DCM) and 1,2-dichloroethane (1,2-DCE) solutions at different time. The results indicated immediate formation of an electron donor-electron acceptor complex; which is followed by two relatively slow consecutive reactions. The pseudo-first-order rate constants for the formation of the ionic intermediate and the final product have been evaluated at 25 °C. The rate of formation of product has been measured as a function of time in different halocarbone solvents. The pseudo first order rate constants were evaluated from the absorbance-time data and found to vary in the order of 1,2-DCE >DCM >CHCl 3 .

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Conductance Studies on Complex Formation Between Aza-18-Crown-6 with Ag+, Hg2+ and Pb2+ Cations in DMSO–H2O Binary Solutions

Cited by 25 publications

References 13 publications

Solvent influence upon complexation of N-phenylaza-15-crown-5 with UO2 2+ cation in binary mixed non-aqueous solvents

Solvent influence upon complexation of N-phenylaza-15-crown-5 with UO2 2+ cation in binary mixed non-aqueous solvents

Theoretical Study on the Extraction of Alkaline Earth Salts by 18-Crown-6: Roles of Counterions, Solvent Types and Extraction Temperatures

Kinetic Study of Charge Transfer Complexes of Iodine With Some Crown Ethers in Nonaqueous Solvents

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