TY - JOUR
T1 - The anion exchange of metal complexes-IV. The iron(III)-chloride system
AU - Marcus, Y.
PY - 1960/2
Y1 - 1960/2
N2 - The anion exchange method described in previous communications was applied to the iron(III)-chloride complex system. The distribution of iron was determined by the batch method. The mononuclearity of the complexes was confirmed for the range 10-3-4 × 10-2 M iron. Distribution curves were obtained for the range 1·0-12 M chloride in lithium chloride and hydrochloric acid solutions. Up to 9 M chloride there is no hydrogen-ion effect, but for more concentrated solutions of hydrochloric acid the distribution is lower than for lithium chloride solutions. Both curves show a maximum. A corrected distribution curve was constructed for the lithium chloride experiments, showing the complexes FeCl2+, FeCl3 and FeCl4-, with the successive stepwise formation constants log k2 ≥ -0.7, log k3 = -1·40 and log k4 = - 1·92. In addition to these species, some undissociated HFeCl4 is also formed in concentrated hydrochloric acid. Spectrophotometric measurements in concentrated chloride solutions confirm these results qualitatively.
AB - The anion exchange method described in previous communications was applied to the iron(III)-chloride complex system. The distribution of iron was determined by the batch method. The mononuclearity of the complexes was confirmed for the range 10-3-4 × 10-2 M iron. Distribution curves were obtained for the range 1·0-12 M chloride in lithium chloride and hydrochloric acid solutions. Up to 9 M chloride there is no hydrogen-ion effect, but for more concentrated solutions of hydrochloric acid the distribution is lower than for lithium chloride solutions. Both curves show a maximum. A corrected distribution curve was constructed for the lithium chloride experiments, showing the complexes FeCl2+, FeCl3 and FeCl4-, with the successive stepwise formation constants log k2 ≥ -0.7, log k3 = -1·40 and log k4 = - 1·92. In addition to these species, some undissociated HFeCl4 is also formed in concentrated hydrochloric acid. Spectrophotometric measurements in concentrated chloride solutions confirm these results qualitatively.
UR - http://www.scopus.com/inward/record.url?scp=0342670640&partnerID=8YFLogxK
U2 - 10.1016/0022-1902(60)80375-2
DO - 10.1016/0022-1902(60)80375-2
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AN - SCOPUS:0342670640
SN - 0022-1902
VL - 12
SP - 287
EP - 296
JO - Journal of Inorganic and Nuclear Chemistry
JF - Journal of Inorganic and Nuclear Chemistry
IS - 3-4
ER -