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Visualization of Ion Conductivity: Vapochromic Luminescence of an Ion-Conductive Ruthenium(II) Metalloligand-Based Porous Coordination Polymer

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posted on 07.12.2015, 00:00 by Ayako Watanabe, Atsushi Kobayashi, Erika Saitoh, Yuki Nagao, Masaki Yoshida, Masako Kato
We synthesized a new porous coordination polymer {La1.75(OH)1.25[Ru­(dcbpy)3]·16H2O} (La7-[4Ru]4; H2dcbpy = 4,4′-dicarboxy-2,2′-bipyridine) composed of a luminescent ruthenium­(II) metalloligand [Ru­(4,4′-dcbpy)3]4– and La3+ cations. X-ray analysis for La7-[4Ru]4 revealed that the La3+ cations and [4Ru] metalloligands are crystallized in a molar ratio of 7:4 with OH counteranions and a void fraction of ∼25.5%. Interestingly, La7-[4Ru]4 shows a reversible structural transition triggered by water ad/desorption, which affects not only the triplet metal-to-ligand charge-transfer (3MLCT) emission energy but also the ion conductivity in the solid state. This correlation suggests that La7-[4Ru]4 is an interesting material that enables visualization of the ion conductivity via the 3MLCT emission energy.