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Abstract: A novel polymeric complex NaCo(o-pba)3(H2O)3 (o-Hpba=2-(1-oxo-1H-2,3-dihydroisoindol-2-yl)benzonic acid) based on racemic N-arylphthalimidine ligand has been prepared and characterized by elemental analysis, spectroscopic and X-ray crystallography methods. In the compound, each Co(II) cation is coordinated by six O atoms from three carboxyl groups of o-pba− and three water molecules in fac-MA3B3 model forming a chiral tripodal Co(o-pba)3(H2O)3 − anion-complex, enantiomeric pairs of which are alternately arranged in head-to-head and tail-to-tail orientations giving rise to a meso-one-dimensional chain-like structure. The compound exhibits high stability and unusual triple-peak luminescence in DMSO solution at room temperature. [Copyright &y& Elsevier]

A new dinuclear europium cluster (Eu-cluster) is synthesized and the exact structure is determined by single-crystal X-ray diffraction. The formula of the Eu-cluster is determined to be [Eu 2 (4-Msal) 6 (phen) 2 (H 2 O) 2 ] (4-Msal = 4-methylsalicylic acid, phen = phenanthroline), it crystallizes in the triclinic space group P -1, with a = 9.1193(8) Å, b = 13.0855(10) Å, c = 14.0981(9) Å, α = 103.159(6)°, β = 94.192(6)°, γ = 100.632(7)°, V = 1598.3(2) Å 3 and Z = 1. Further investigation reveals that the Eu-cluster is a highly sensitive and selective methylmercury (CH 3 Hg + ) sensor. To the best of our knowledge, this is the first CH 3 Hg + sensor based on lanthanide clusters/complexes. The responsive behavior shows the sensing has excellent linearity in 1.4–3.8 μg L −1 μM. The LOD for sensing CH 3 Hg + is 0.8 μg L −1 , which meets the standard of Chinese environmental quality standard for agricultural and industrial water. Interestingly, study also reveals the sensor is applicable in real water sensing. [ABSTRACT FROM AUTHOR]