TY - JOUR
T1 - Additional Aspects of Complexation of Gold(I) with Thiomalate
AU - Mironov, Igor V.
AU - Kharlamova, Viktoria Yu
PY - 2018/3
Y1 - 2018/3
N2 - Some equilibria involving gold(I) thiomalate (mercaptosuccinate, TM) complexes have been studied in the aqueous solution at 25 °C and I = 0.2 mol·L−1 (NaCl). In the acidic region, the oxidation of TM by (Formula presented.) proceeds with the formation of sulfinic acid, and gold(III) is reduced to gold(I). The interaction of gold(I) with TM at nTM/nAu ≤ 1 leads to the formation of highly stable cyclic polymeric complexes (Formula presented.) with various degrees of protonation depending on pH. In general, the results agree with the tetrameric form of this complex proposed in the literature. At nTM/nAu > 1, the processes of opening the cyclic structure, depolymerization and the formation of (Formula presented.) occur: (Formula presented.), log10K45 = 10.1 ± 0.5; 0.25 (Formula presented.), log10K12 = 4.9 ± 0.2. The standard potential of (Formula presented.) is (Formula presented.). The numerous protonation processes of complexes at pH < 7 were described with the use of effective functions.
AB - Some equilibria involving gold(I) thiomalate (mercaptosuccinate, TM) complexes have been studied in the aqueous solution at 25 °C and I = 0.2 mol·L−1 (NaCl). In the acidic region, the oxidation of TM by (Formula presented.) proceeds with the formation of sulfinic acid, and gold(III) is reduced to gold(I). The interaction of gold(I) with TM at nTM/nAu ≤ 1 leads to the formation of highly stable cyclic polymeric complexes (Formula presented.) with various degrees of protonation depending on pH. In general, the results agree with the tetrameric form of this complex proposed in the literature. At nTM/nAu > 1, the processes of opening the cyclic structure, depolymerization and the formation of (Formula presented.) occur: (Formula presented.), log10K45 = 10.1 ± 0.5; 0.25 (Formula presented.), log10K12 = 4.9 ± 0.2. The standard potential of (Formula presented.) is (Formula presented.). The numerous protonation processes of complexes at pH < 7 were described with the use of effective functions.
KW - Complexes of gold(I)
KW - Polymeric complexes
KW - Protonated complexes
KW - Thiomalate
KW - NANOPARTICLES
KW - MYOCHRYSINE
KW - ANTIARTHRITIC DRUG
KW - 2-MERCAPTOSUCCINIC ACID
UR - http://www.scopus.com/inward/record.url?scp=85044175298&partnerID=8YFLogxK
U2 - 10.1007/s10953-018-0735-y
DO - 10.1007/s10953-018-0735-y
M3 - Article
AN - SCOPUS:85044175298
VL - 47
SP - 511
EP - 527
JO - Journal of Solution Chemistry
JF - Journal of Solution Chemistry
SN - 0095-9782
IS - 3
ER -