| http://www.w3.org/ns/prov#value | - Suitable quaternary salts have the general structure:wherein E is N, P, or Sb; each R' is independently C.sub.1-4 alkyl, and X is an anion such as hydroxide or some species that generates OH.sup.- on reaction with water.Exemplary divalent cations are: Mg.sup.2+, Ca.sup.2+, Ba.sup.2+, Ni.sup.2+, and Co.sup.2+.The diol that is employed may be any one having the formula: ##STR13## wherein x is 0 or 1
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