Add time:07/20/2019         Source:sciencedirect.com

Self-assembly of a flexible ligand Hcbba (2-(4-chlorobenzoyl)benzoic acid) and lanthanide salts yield a series of three-dimensional (3D) coordination polymers under hydrothermal conditions, namely, [Ln(cbba)3H2O]∞ (Ln = La(I), Pr(II), and Nd(III)). Their structures were determined by single-crystal X-ray diffraction analyses and characterized by elemental analyses and infrared spectroscopy, which verified that they are isomorphous and isostructural. Findings indicate that the subunit of cavate cages (Ln2O2(OCO)2) are observed in I–III, which are connected into a one-dimensional (1D) chain through cbba− anions in μ2-η1:η1 fashion and further assembled into 3D architecture via C–H⋯π and C–H⋯Cl interactions between the neighboring parallel 1D chains. I–III feature that the double-stranded helix entangled by one left- and one right-handed helical chain coaxially along c axis in each 1D infinite chain. Luminescent properties reveal that II and III may be potential ion-selective luminescent probes for Hg2+ and Ag+, respectively.

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