Polypyridinium
AssigneeMinnesota Mining and Manufacturing Company
InventorsAlan R. Katritzky, Larry R. Krepski, Jerald K. Rasmussen, Steven M. Heilmann, Richard D. Tarr
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Abstract
A novel class of polymers comprises one or more dipyridinium units, having the formula ##STR1## contained within the main polymer backbone where Ar.sup.1, Ar.sup.2, and Ar.sup.3 are aromatic or heteroaromatic nuclei each of which can consist of one ring or two fused or catenated rings having 5 to 12 ring carbon and heteroatoms which can include 1 to 3 unitary heteroatoms selected from S, N and O, R.sup.1 is any divalent organic bridging group, and Z.sup..crclbar. is a counterion.
Claims10
A polymer comprising dipyridinium units having the formula:
- ##STR38## wherein Ar.sup.1, Ar.sup.2, and Ar.sup.3 are the same or different aromatic or heteroaromatic group each of which contains one ring or two fused or catenated rings having 5 to 12 ring carbon or heteroatoms, R.sup.1 is any divalent organic bridging group, and Z.sup..crclbar. is a counterion.
A method for preparing a polymer comprising polypyridinium units comprising the steps of:
- (a) reacting a bis(pyrylium) salt having the formula ##STR39## wherein Ar.sup.1, Ar.sup.2, and Ar.sup.3 are the same or different aromatic or heteroaromatic group each of which contains one ring or two fused or catenated rings having 5 to 12 ring carbon or heteroatoms, and Z.sup.- is a counterion with a diamine having the formula
- H.sub.2 N--R.sup.1 --NH.sub.2
- wherein R.sup.1 is a divalent organic bridging group, in the presence of an organic base,
- (b) adding acid in excess relative to the amount of organic base present, and
- (c) isolating the resulting polymer comprising polypyridinium units.
Dependencies are inferred from the claim text.