A series of lanthanide-organic frameworks [Ln(Himdc)(ina)(HO)] (Ln = Eu 1a; Sm 1b; and Nd 1c, Himdc = imidazole-4,5-dicarboxylic acid, Hina = isonicotinic acid) were synthesized under hydrothermal conditions. All compounds 1a-1c consist of a 3D microporous lanthanide carboxylate ([Eu(COO)]) framework and uncoordinated Lewis basic pyridyl and imidazole groups hung in the channels. The luminescence investigations show that the compound 1c displays an interesting NIR luminescence property. The compound 1a exhibits a good potential as a luminescent multi-responsive sensing material for Fe ions and CrO anions.
By incorporating a viologen moiety into a framework, a multiresponsive 2D bilayered luminescent Cd-viologen complex {[Cd 1.5 (Cebpy)(Hbtc)Cl]·H 2 O} n , (1, Cebpy = 1-carboxyethyl-4, 4'-bipyridine, H 3 Hbtc = 1, 3, 5-benzenetricarboxylic acid) has been synthesized. The reversible photochromism from light brown to dark bluish-grey is implemented due to the favourable spatial stack of the electron donor and acceptor. The photochromic component of the organic linkers can modulate the luminescence of compound 1 under irradiation by using a Xenon lamp. At the same time, compound 1 shows a good potential in luminescent sensing for colored transition metal cations. Thus, multiphotofunctionality, viz. photoluminescence, photochromism as well as the derivate fluorescent responses to irradiation and colored transition metal cations have been combined in the Cd-viologen complex 1, which is the first example in the Cd-viologen-based photochromic hybrid materials.
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