Scheme 1.
Steps for the syntheses of L1 (R = CH3(CH2)13) and H2L2. (i) Aniline, p-toluenesulfonic acid, EtOH, RT, 24 h; (ii) 4,4′-dimethyl-2,2′-bipyridine, KOtBu, DMF, 80°C, 2 h.
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