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

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

“…Our speciation models for the same systems are more complicated because they present the formation of four species for each system. By way of comparison, in ref , Δ H = −92.8 kJ·mol −1 is reported for Hg 2 (Gly) species, which is close to our result of Δ H = −87 kJ·mol −1 . (See Table .)…”

“…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.…”

“…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. Our speciation models for the same systems are more complicated because they present the formation of four species for each system.…”