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A compound or a salt thereof comprising a polyamine containing at least 2 electron-affinic groups is provided. In a preferred embodiment, the polyamine compound has the structure: wherein: PA1 A is a spacer; R.sup.1, R.sup.2, R.sub.3, and R.sub.4 are independently hydrogen, hydrocarbon, heterosubstituted hydrocarbon, heteroaryl, heterosubstituted heteroaryl, or an electron-affinic group containing substituent; and the compound contains at least one tertiary amine functionality having three substituents each of which independently contain at least one electron-affinic group or hydrophilic group.
