A novel ruthenium(II) polypyridyl complex bearing 1,8-naphthyridine was successfully designed and synthesized. This complex was fully characterized by EI-HRMS, NMR, and elemental analyses. The recognition properties of the complex for various metal ions were investigated. The results suggested that the complex displayed high selectivity and sensitivity for Cu2+ and Fe3+ ions with good anti-interference in the CH3CN/H2O (1:1, v/v) solution. The fluorescent chemosensor showed obvious fluorescence quenching when the Cu2+ and Fe3+ ions were added. The detection limits of Cu2+ and Fe3+ were 39.9 nmol/L and 6.68 nmol/L, respectively. This study suggested that this Ru(II) polypyridyl complex can be used as a high selectivity and sensitivity fluorescent chemosensor for Cu2+ and Fe3+ ions.

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In the centrosymmetric dinuclear cation of the title complex, [Cu2(C10H8N2)2(C12H10N2)(C18H15P)2](BF4)2, each Cu atom is coordinated by two N atoms from a 2,2‐bipyridine ligand and a P atom from a triphenylphosphine ligand, and the two N2PCu+ fragments are bridged by a trans‐1,2‐di‐4‐pyridylethylene ligand, resulting in a distorted tetrahedral coordination geometry. Two F atoms are disordered over two sites each, with almost equal occupancies.

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