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Coordination properties of polymeric azacrown ethers
Author(s) -
S. Psheshetsky V.,
Lishinsky V. L.,
Kokorin A. I.,
Tsarkova L. A.,
Rakhnianskaja A. A.,
Pertsov N. V.
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920590115
Subject(s) - chemistry , flocculation , polymer , adsorption , polymer chemistry , selectivity , colloid , inorganic chemistry , metal ions in aqueous solution , monomer , chemical engineering , organic chemistry , metal , catalysis , engineering
New polymeric aza‐crown ethers (PACE), soluble in water and organic solutions and cross‐linked ones, containing different macrocycles in side chains have been synthesised by polymerisation and chemical modification reactions. The coordination próperties of these PACE are studied. It is shown that during coordination of the VO 2+ , Cu 2+ ions with PACE, cross‐linking of macromolecules by metal ions takes place by “sandwich” complex formation. The character of complexes distribution along PACE coils may be equal or nonequal, depending on polymer reactivity. The synthesised PACE are used as high specific polymer reagents for colloid rare metals recovery. It is shown that flocculation of negatively charged inorganic sols with PACE is due to electrostatic adsorption and specific binding. In acid and neutral media, dispersions of gold, silver, copper ferrocyanide and silicon dioxide undergo high flocculation as a result of non‐specific electrostatic adsorption. Alkaline media provide conditions for donor‐acceptor binding, increasing flocculation selectivity. In the uncharged state (pH 11,2) PACE exhibit high selectivity in binding gold particles. Stability of colloidal dispersions in the presence of monomer aza‐crown ether (ACE) indicates an important polymer influence on the fine metal particles flocculation.