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Metal-ion selectivity of receptor 1 towards Fe3+ ions (10 μM) in the presence of competitive ions (10 μM): 1 (receptor 1); 2 (1 + Fe3+); 3 (1 + Ag+ + Fe3+); 4 (1 + Al3+ + Fe3+); 5 (1 + Ba2+ + Fe3+); 6 (1 + Ca2+ + Fe3+); 7 (1 + Cd2+ + Fe3+); 8 (1 + Co2+ + Fe3+); 9 (1 + Cr3+ + Fe3+); 10 (1 + Cu2+ + Fe3+); 11 (1 + Hg2+ + Fe3+); 12 (1 + In3+ + Fe3+); 13 (1 + Mg2+ + Fe3+) 14 (1 + Mn2+ + Fe3+); 15 (1 + Ni2+ + Fe3+); 16 (1 + Pb2+ + Fe3+); 17 (1 + Zn2+ + Fe3+).
