Thermodynamic Constants of Complex Ion Formation between Mercury(II) and Three Alkylamines

Interaction of Inorganic Mercury(II) with Polyamines, Polycarboxylates, and Amino Acids

“…Moreover, in the literature are also reported Δ H = (41.2 and 41.1) kJ·mol −1 at I = (1 and 3) mol·L −1 , respectively, in NaClO 4 . , For the reaction Hg 2+ + 2Cl − = HgCl 2 0 , we obtained Δ H = − 55 kJ·mol −1 , which is close to Δ H = (− 53.6, − 50.9, and − 51.4) kJ·mol −1 in NaClO 4 at I = (0.5, 1, and 3) mol·L −1 , respectively. − For the ternary species HgCl(OH) 0 , referred to the reaction Hg 2+ + Cl − + H 2 O = HgCl(OH) 0 + H + , we obtained Δ H = − 2.5 kJ·mol −1 , which is in absolute agreement with Δ H = − 3.2 kJ·mol −1 at I = 1 mol·L −1 in NaClO 4 . In the literature, there are only a few works regarding enthalpy values of species containing Hg 2+ and amines. ,, No Δ H or T Δ S values have been reported for the Hg 2+ −btc, −mlt, and −pei systems. In the papers of Roe et al and Partridge et al, for the systems containing en, dien, and Gly, the formation of M 2 L species is proposed.…”

“…[68][69][70] For the ternary species HgCl(OH) 0 , referred to the reaction Hg 2+ 71 In the literature, there are only a few works regarding enthalpy values of species containing Hg 2+ and amines. 20,29,72 No ∆H or T∆S values have been reported for the Hg 2+ -btc, -mlt, and -pei systems. In the papers of Roe et al 20 ), 29 and tetren (∆H ) -139.7 kJ • mol -1 ) 29 shows that the increase in the number of -NH 2 groups from three to five induces little enthalpy difference.…”

“…20,29,72 No ∆H or T∆S values have been reported for the Hg 2+ -btc, -mlt, and -pei systems. In the papers of Roe et al 20 ), 29 and tetren (∆H ) -139.7 kJ • mol -1 ) 29 shows that the increase in the number of -NH 2 groups from three to five induces little enthalpy difference.…”

“…Ligand classes considered were: (1) O-donor ligands, such as di- (succinate), tetra- (1,2,3,4-butanetetracarboxylate), and hexa- (1,2,3,4,5,6-benzenehexacarboxylate) carboxylates, and polyelectrolytes, such as polymethacrylate and polyacrylates, at two different molecular weights; (2) N-donor ligands, such as amines containing a different number of aminic groups (from ethylenediamine to tetraethylenepentamine), and polyelectrolytes, such as poly(allylamine) and poly(ethylenimine); and (3) amino acids such as glycine containing one carboxylic and one amino group, histidine containing an additional amino group, and aspartic acid containing an additional carboxylic group. Hg 2+ −carboxylate, −amine, and −amino acid systems reported in the literature are collected in Table . − In this article, equilibria were studied potentiometrically in NaNO 3 at I = 0.1 mol·L −1 and t = 25 °C. Under the same conditions, for Hg 2+ −1,2,3,4-butanetetracarboxylate, −1,2,3,4,5,6-benzenehexacarboxylate, −diethylenetriamine, −poly(ethylenimine), and −glycine systems, the enthalpy changes by calorimetric measurements were also determined.…”

Log K, ΔH°, and ΔS° Values for the Stepwise Replacement of Cl- in HgCl2(aq) by Ethylenediamine, Glycinate Ion, and Methylamine at 25°1

“…In addition to these, sequences involving the formation of polynuclear species were proposed and tested. For the HgCl2(aq)-glycinate system, reaction sequences [6][7][8] were proposed as possible descriptions of the reactions occurring in MeNH2 is a unidentate ligand the reactions were analogous to the HgCl2(aq)-OHsystem, and log K values were calculated for reactions 9a and 9b only.…”