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