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In this work, phenylmalonic acid (H2pmal) and phenanthroline (phen) are selected to react with Ln(NO3)3·6H2O (Ln = Tb, Eu) to form two lanthanide coordination complex [Ln2(PAA)4(phen)2(NO3)2] (Ln = Tb, Tb complex; Eu, Eu complex), PAA = deprotonated phenylacetic acid, phen = 1,10‐phenanthroline). Two lanthanide complexes are stable in neutral, acid (pH = 4) and base (pH = 10) water solutions. Especially, Tb complex is a bifunctional sensor for acac and Cd2+, through luminescence “turn on” and “turn off,” respectively. Importantly, the limit of detections (LODs) for acac and Cd2+ are 90 nm and 0.5 μm, respectively. Furthermore, the sensing mechanisms are discussed in detail.