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A novel multifunctional coordination polymer {[Zn(HCOO) (bcbpy)Cl]·H 2 O} n (1) with multiple colour-changing has been synthesized from Zn(NO 3) 2 ·6H 2 O, and viologen ligand 1,1′-bis-((3-carboxylatobenzyl)-4,4′-bipyridinium) dichloride (H 2 bcbpy·2Cl). In coordination polymer (CP) 1 , bcbpy ligands bridge Zn2+ cations to form a 1D wave-like chain. CP 1 exhibited photochromic properties under xenon lamp and blue light irradiation while obtaining a structurally stable light product 1T. CP 1 thermochromic properties can also be observed during heating. 1 showed photo-controlled fluorescence properties during color rendering and decolorization, and its properties were studied. Interestingly, CP 1 can be deposited in filter paper by coating it with a solution of H 2 O. The filter paper can be used as a printing medium without ink. [Display omitted] • CP 1 was synthesized using viologen ligand 1,1′-bis-((3-carboxylatobenzyl)-4,4′-bipyridinium) dichloride (H 2 bcbpy·2Cl). • CP 1 exhibited photochromic properties under xenon lamp and blue light irradiation. • CP 1 obtaining a structurally stable light product 1T after irradiation. • CP 1 can be used as a good ink-free printing medium. [ABSTRACT FROM AUTHOR]

Two water-stable Cd(II)-MOFs, [CdL 0.5 (H 2 O)] (1) and {[Cd 3 (H 2 L)(dtb) 2 (H 2 O)]·3H 2 O} n (2) [H 4 L ​= ​1,1'-(ethane-1,2-diyl)bis (1H-imidazole-4,5-dicarboxylic acid); H 2 dtb ​= ​1,4-di (1H-tetrazol-5-yl)benzene) has been hydrothermally synthesized and characterized by elemental analyses, IR, TG, and X-ray single-crystal diffraction. Complex 1 exhibits a 3D 6-connected framework based on L4− ligands μ 6 -linking [Cd 2 O 2 ] unit, and complex 2 possesses a 3D (3,8)-connected porous framework built by H 2 L2− and dtb2− ligands bridging [Cd 3 O 2 ] units. The luminescence properties were investigated, showing that 1 and 2 can display high sensitivity and selectivity for detecting Fe3+, Cr(VI) and MnO 4 − ions in aqueous solutions via luminescence quenching effects. Furthermore, possible sensing mechanism was investigated in this paper. Two water-stable luminescent Cd(II)-MOFs has been hydrothermally synthesized by using a new flexible ligand (H 4 L) containing two H 2 IDC groups. Complex 1 exhibits a 3D 6-connected framework based on L4− ligands μ 6 -linking [Cd 2 O 2 ] unit, and complex 2 possesses a 3D (3,8)-connected porous framework built by H 2 L2− and dtb2− ligands bridging [Cd 3 O 2 ] units. Luminescence sensing performances reveal that two complexes behave satisfactory recognition and detection effect toward Fe3+, Cr(VI) and MnO 4 − ions with low detection limit and high sensitivity, which may be acted as potential multi-responsive luminescence sensing materials. Furthermore, possible sensing mechanism was investigated in this paper. [Display omitted] • A new ligand containing two H 2 IDC groups was firstly employed to construct MOFs. • Two water-stable Cd(II)-MOFs have been hydrothermally synthesized. • Complexes 1 and 2 exhibited 3D porous frameworks, respectively. • Both 1 and 2 displayed potential multi-responsive luminescence sensing capabilities. [ABSTRACT FROM AUTHOR]