A highly luminescent LnMOF {[Eu 2 (bqdc) 3 (H 2 O)(DMF) 3 ]$0.5DMF$H 2 O} n (1, bqdc ¼ 2,2 0 -biquinoline-4,4 0dicarboxylate) was designed and synthesized. It was characterized by single crystal X-ray diffraction, PXRD, TGA, EA and FT-IR. A new strategy for preparing mechanically robust MOF thin films was developed by electrodeposition in combination with subsequent solvothermal synthesis. A portable sensor device prototype consisting of a film of 1 was conveniently fabricated by using this new strategy and this sensor device exhibits a highly selective response to Hg 2+ . Its luminescence quenching can be distinguished clearly with the naked eye when illuminated by a handy UV banknote detector. The diffusion kinetics of Hg 2+ into the LnMOF film is first proposed.
Drastic change of luminescent QY was found in a serial of guest-tuned lanthanide CPs. An octupolar-like structure lanthanide CP shows a high two-photon luminescence.
A flexible organometallic ligand, 1,1'-ferrocenedicarboxylic acid, was incorporated in the self-assembly of a d-f mixed-metal coordination polymer featuring a 2-D interlinking zigzag-chain network and bearing two kinds of bridging conformations.
COMMENTIn the course of metalloenzyme model studies, we have isolated a mononuclear complex Zn(Hmmi) 2 Cl 2 (Hmmi = 2-hydroxymethyl-1-methyl-imidazole), 1 in which only the N atom is coordinating to the central metal ion, while the O atom is free. Recent reports have shown that d 10 metals, such as Zn(II) and Cd(II) ions chelated by rigid aromatic groups, promise intriguing photoelectronic properties.2,3 In the CdI 2 adduct, Fig. 1, Cd is chelated by O and N atoms from one imidazole ligand, one N from a second imidazole ligand and two I atoms, resulting in a trigonal bipyramidal geometry. Extensive hydrogen bonding interactions between hydroxymethyl groups give rise to a chain structure.
EXPERIMENTALCdI 2 (0.1 g) in ethanol (5 ml) was added to an aqueous solution (3 ml) of Hmmi (0.1 g). The solution was stirred at 50• C for 10 min, and dilute NaOH was added until a white precipitate appeared. The pH of the solution was then adjusted to ∼6.5 with HNO 3 and a clear solution resulted. After filtration, the filtrate was kept in the dark at room temperature. Some colorless rhombic block crystals suitable for X-ray analysis were deposited after one month, yield ∼30%. Data collection was performed at 293(2) K on a Bruker
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