A semi-rigid ligand could capture effectively Yb(3+) ions to form a stable Yb(3+) complex and provide a potential cavity to accommodate alkali metal ions. Only K(+) ions could induce the Yb(3+) complex to form a 1D coordination polymer and promote the in situ formation of an NIR membrane coated with bigger Yb(3+) complex crystallites under mild conditions.
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