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We present the crystal structures of the chloride salts of the mono-guanidinium 1 (–CH2CH2– linker) and the bis-isouronium 2 (–O– linker) that have been resolved by us indicating that these compounds are diprotonated in the solid state as informed by the counterions positions. To determine the pKa values of these compounds as well as those of their analogues 3 (mono-2-aminoimidazolinium with a –CH...
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