Chiral Assembly and Recognition of Seven Copper (II) Coordination Polymers from Tartaric Acid Derivative Ligands.

A pair of enantiomeric ligands, (2R,3R)-dibenzyl-2,3-bis(isonicotinoyloxy)succinate ((R,R)-L) and (2S,3S)-dibenzyl-2,3-bis(isonicotinoyloxy)succinate ((S,S)-L), are designed and synthesized. Seven copper (II) coordination polymers {[Cu((R,R)-L)Br (THF)] ⋅ CH CN} (1 a) and {[Cu((S,S)-L)Br (THF)] ⋅ CH CN} (1 b), {[Cu((R,R)-L)Cl (THF)] ⋅ CH CN} (2 a) and {[Cu((S,S)-L)Cl (THF)] ⋅ CH CN} (2 b), {[Cu((R,R)-L)(NO ) (CH CN)]} (3 a) and {[Cu((S,S)-L)(NO ) (CH CN)]} (3 b), {[Cu((R,R)-L) (CH CN) ](ClO )  ⋅ 3CH CN} (4) were obtained through the assemblies with CuBr , CuCl  ⋅ 2H O, Cu(NO )  ⋅ 3H O, Cu(ClO )  ⋅ 6H O, respectively. Single-crystal X-ray diffraction and circular dichroism analysis demonstrate that 1 a-3 a, 1 b-3 b have a mono chiral one-dimensional (1D) chain-like spiral structure, while 4 have 1D chain-like structure whose metal centers have chiral propeller coordination environment.

Dinuclear Hg tetracarbene complex-triggered aggregation-induced emission for rapid and selective sensing of Hg and organomercury species.

Rapid, reliable and highly selective detection of mercury species, including Hg ions and organomercury, is of significant importance for environmental protection and human health. Herein, a new fluorescent dye 1,1,2,2-tetrakis[4-(3-methyl-1-benzimidazol-1-yl)phenyl ethylene tetraiodide () with aggregation-induced emission (AIE) potential was prepared and characterized. The presence of four positively charged methylated benzimidazole groups endows with excellent water solubility and almost undetectable background fluorescence.