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Coordination polymers from 1,3,4‐thiadiazole‐2,5‐dithiol and metal ions
Author(s) -
Ortega Pedro,
Vera Leonel R.,
Guzmán Miguel E.
Publication year - 1997
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1997.021980923
Subject(s) - polymer , dithiol , metal , polymer chemistry , polymerization , aqueous solution , stoichiometry , metal ions in aqueous solution , materials science , conductivity , ligand (biochemistry) , electrolyte , chemistry , inorganic chemistry , organic chemistry , electrode , composite material , biochemistry , receptor
The copolymerization of 1,3,4‐thiadiazole‐2,5‐dithiol (bismuthiol) with 1+, 2+, and 3+ valent metals is reported. Polymerization conditions were mimicked by means of Job's technique of solutions mixing. The polymers in aqueous solutions do not conduct electricity, but electrolytes are formed in proportion to polymer formation and the pH changes. The metal concentration in solutions confirms the metal‐ligand stoichiometry. The UV absorption of the ligand (at 320 nm) decreases and light scattering by polymer (at 380 nm) increases with polymer formation. The stoichiometry of polymers (obtained from the conductivity inflection point and metal analysis) is as follows. Mt 2+ : bismuthiolate = 1 : 1; Al 3+ : bismuthiolate = 2 : 3 and Ag + : bismuthiolate = 2 : 1. Equations describing polymer formation on the basis of the solution conductivities are presented, and a model of polymer formation is proposed. It is concluded that 2+ valent metals from linear polymers but Al 3+ forms branched polymers.