Conformational Isomerism of 1,2-Bis(imidazol-1′-yl)ethane Affected by the Orientation of Functional Carboxylate Groups in Cadmium and Cobalt Helical Coordination Polymers Xiaoju Li Xiulan Weng Ruijie Tang Yuanmiao Lin Zhilong Ke Wenbiao Zhou Rong Cao 10.1021/cg100350b.s003 https://acs.figshare.com/articles/dataset/Conformational_Isomerism_of_1_2_Bis_imidazol_1_yl_ethane_Affected_by_the_Orientation_of_Functional_Carboxylate_Groups_in_Cadmium_and_Cobalt_Helical_Coordination_Polymers/2754646 Four helical coordination polymers, [Cd(<i>anti</i>-bime)(1,3-pda)]<sub><i>n</i></sub> (<b>1</b>), [Cd(<i>gauche</i>-bime)(1,4-pda)]<sub><i>n</i></sub> (<b>2</b>), [Co(<i>anti</i>-bime)(1,2-pda)]<i><sub>n</sub></i> (<b>3</b>), and [Co(<i>gauche</i>-bime)(1,4-pda)]<sub><i>n</i></sub> (<b>4</b>), have been solvothermally prepared by the assembly of mixed flexible ligands, bime and 1,3-H<sub>2</sub>pda, 1,4-H<sub>2</sub>pda, 1,2-H<sub>2</sub>pda with Cd(NO<sub>3</sub>)<sub>2</sub>·4H<sub>2</sub>O and Co(NO<sub>3</sub>)<sub>2</sub>·6H<sub>2</sub>O, respectively (bime = 1,2-bis(imidazol-1′-yl)ethane, 1,3-H<sub>2</sub>pda = 1,3-phenylenediacetic acid, 1,4-H<sub>2</sub>pda = 1,4-phenylenediacetic acid, 1,2-H<sub>2</sub>pda = 1,2-phenylenediacetic acid). Single-crystal X-ray diffraction analyses reveal that all of the complexes possess helical structures owing to the use of mixed flexible ligands; the conformations of flexible bime are entirely different, <i>anti</i>-bime occurs in <b>1</b> and <b>3</b>, while <i>gauche</i>-bime occurs in <b>2</b> and <b>4</b>. The fluorescent properties of <b>1</b> and <b>2</b> suggest that the intense broad photoluminescence emission at 387 nm for <b>1</b> and 389 nm for <b>2</b>, <b>3</b>, and <b>4</b> exhibit similar weak antiferromagnetic coupling between the Co<sup>2+</sup> centers. 2010-07-07 00:00:00 helical structures 4 exhibit 2pda Functional Carboxylate Groups phenylenediacetic 387 nm acid bime photoluminescence emission 389 nm Conformational Isomerism Cobalt Helical Coordination PolymersFour helical coordination polymers