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Solutions of  polymers P1, P2 and models 3, 4 were dilute at a concentration
of 10-6 M (the concentration of polymers is based on the
moles of the repeated unit) in CH2Cl2. Solutions of cationic
perchlorate salts or cationic nitrate salts with the concentration
of typically 10-4 M were prepared by successive
dilution. Fluorescence titration was carried out by sequentially
adding 0.1 mL aliquots of cation solutions in CH2Cl2 to 5.00
mL of the polymer solutions, and CH2Cl2 was added to acquire
10.00 mL of solutions.

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