Conformational effect of 2,6-bis(imidazol-1-yl)pyridine on the self-assembly of 1D coordination chains: Spontaneous resolution, supramolecular isomerism, and structural transformation

Chih Yuan Chen, Pi Yun Cheng, Hsin Hsuan Wu, Hon Man Lee

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

The achiral 2,6-bis(imidazol-1-yl)pyridine (L) was used as the ditopic organic tecton for the formation of coordination polymers with Zn(II) ions. Hydrothermal reaction between L and ZnX2 (X = Br, Cl) afforded spontaneous resolved double helical motifs in ZnLCl2·0.5H 2O (1) and ZnLBr2·0.25H2O (2). In the homochiral crystals of 1a and 2a, the helices are of M-helicity, whereas, in 1b and 2b, they are of P-helicity. In contrast, solvothermal reaction between L and ZnCl2 in dried DMF afforded achiral ZnLCl2 (3a), which exhibits a zigzag polymeric motif. An achiral polymorph 3b which contains 2 1 helical chains was obtained in wet DMF. The formation of different 1D motifs was related to the conformations of L. All these compounds were characterized by infrared spectroscopy, elemental analyses, and single-crystal X-ray diffraction. As revealed by thermal gravimetric analysis and powder X-ray diffraction study, the homochiral motif in 1 was stable even upon removal of guest water molecules. Contrastingly, structural transformation from 3a or 3b to 1 is possible upon hydration.

Original languageEnglish
Pages (from-to)5691-5699
Number of pages9
JournalInorganic Chemistry
Volume46
Issue number14
DOIs
Publication statusPublished - 2007 Jul 9

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Gravimetric analysis
Polymorphism
imidazoles
Hydration
X ray powder diffraction
Self assembly
Conformations
self assembly
Infrared spectroscopy
pyridines
Polymers
Single crystals
Ions
X ray diffraction
Crystals
Molecules
Water
coordination polymers
diffraction
helices

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

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title = "Conformational effect of 2,6-bis(imidazol-1-yl)pyridine on the self-assembly of 1D coordination chains: Spontaneous resolution, supramolecular isomerism, and structural transformation",
abstract = "The achiral 2,6-bis(imidazol-1-yl)pyridine (L) was used as the ditopic organic tecton for the formation of coordination polymers with Zn(II) ions. Hydrothermal reaction between L and ZnX2 (X = Br, Cl) afforded spontaneous resolved double helical motifs in ZnLCl2·0.5H 2O (1) and ZnLBr2·0.25H2O (2). In the homochiral crystals of 1a and 2a, the helices are of M-helicity, whereas, in 1b and 2b, they are of P-helicity. In contrast, solvothermal reaction between L and ZnCl2 in dried DMF afforded achiral ZnLCl2 (3a), which exhibits a zigzag polymeric motif. An achiral polymorph 3b which contains 2 1 helical chains was obtained in wet DMF. The formation of different 1D motifs was related to the conformations of L. All these compounds were characterized by infrared spectroscopy, elemental analyses, and single-crystal X-ray diffraction. As revealed by thermal gravimetric analysis and powder X-ray diffraction study, the homochiral motif in 1 was stable even upon removal of guest water molecules. Contrastingly, structural transformation from 3a or 3b to 1 is possible upon hydration.",
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Conformational effect of 2,6-bis(imidazol-1-yl)pyridine on the self-assembly of 1D coordination chains : Spontaneous resolution, supramolecular isomerism, and structural transformation. / Chen, Chih Yuan; Cheng, Pi Yun; Wu, Hsin Hsuan; Lee, Hon Man.

In: Inorganic Chemistry, Vol. 46, No. 14, 09.07.2007, p. 5691-5699.

Research output: Contribution to journalArticle

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T1 - Conformational effect of 2,6-bis(imidazol-1-yl)pyridine on the self-assembly of 1D coordination chains

T2 - Spontaneous resolution, supramolecular isomerism, and structural transformation

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AU - Cheng, Pi Yun

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AU - Lee, Hon Man

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N2 - The achiral 2,6-bis(imidazol-1-yl)pyridine (L) was used as the ditopic organic tecton for the formation of coordination polymers with Zn(II) ions. Hydrothermal reaction between L and ZnX2 (X = Br, Cl) afforded spontaneous resolved double helical motifs in ZnLCl2·0.5H 2O (1) and ZnLBr2·0.25H2O (2). In the homochiral crystals of 1a and 2a, the helices are of M-helicity, whereas, in 1b and 2b, they are of P-helicity. In contrast, solvothermal reaction between L and ZnCl2 in dried DMF afforded achiral ZnLCl2 (3a), which exhibits a zigzag polymeric motif. An achiral polymorph 3b which contains 2 1 helical chains was obtained in wet DMF. The formation of different 1D motifs was related to the conformations of L. All these compounds were characterized by infrared spectroscopy, elemental analyses, and single-crystal X-ray diffraction. As revealed by thermal gravimetric analysis and powder X-ray diffraction study, the homochiral motif in 1 was stable even upon removal of guest water molecules. Contrastingly, structural transformation from 3a or 3b to 1 is possible upon hydration.

AB - The achiral 2,6-bis(imidazol-1-yl)pyridine (L) was used as the ditopic organic tecton for the formation of coordination polymers with Zn(II) ions. Hydrothermal reaction between L and ZnX2 (X = Br, Cl) afforded spontaneous resolved double helical motifs in ZnLCl2·0.5H 2O (1) and ZnLBr2·0.25H2O (2). In the homochiral crystals of 1a and 2a, the helices are of M-helicity, whereas, in 1b and 2b, they are of P-helicity. In contrast, solvothermal reaction between L and ZnCl2 in dried DMF afforded achiral ZnLCl2 (3a), which exhibits a zigzag polymeric motif. An achiral polymorph 3b which contains 2 1 helical chains was obtained in wet DMF. The formation of different 1D motifs was related to the conformations of L. All these compounds were characterized by infrared spectroscopy, elemental analyses, and single-crystal X-ray diffraction. As revealed by thermal gravimetric analysis and powder X-ray diffraction study, the homochiral motif in 1 was stable even upon removal of guest water molecules. Contrastingly, structural transformation from 3a or 3b to 1 is possible upon hydration.

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