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Publication
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| Research Title |
2D-1D STRUCTURAL PHASE TRANSFORMATION OF Co(II) 3,5-PYRIDINEDICARBOXYLATE FRAMEWORKS BY THERMAL DE/REHYDRATION PROCESSES |
| Date of Distribution |
11 January 2012 |
| Conference |
| Title of the Conference |
Pure and Applied Chemistry International Conference 2012 (PACCON 2012) |
| Organiser |
สมาคมเคมีแห่งประเทศไทย (Chemical Society of Thailand) |
| Conference Place |
The Empress Convention Center Chiang Mai, Thailand |
| Province/State |
Chiang Mai, Thailand |
| Conference Date |
11 January 2012 |
| To |
13 January 2012 |
| Proceeding Paper |
| Volume |
1 |
| Issue |
1 |
| Page |
529 |
| Editors/edition/publisher |
สมาคมเคมีแห่งประเทศไทย (Chemical Society of Thailand) |
| Abstract |
A new metal-organic framework [Co(3,5-pyc)(H2O)2]n (1) (3,5-pyc = 3,5-pyridinedicarboxylate) have been synthesized by diffusion method and characterized by single-crystal X-ray diffraction. Structural determination reveals that, each Co(II) ion coordinates to three ligands and each ligand bridges three Co(II) ions, resulting an infinite 2D layer with honeycomblike cavities. Adjacent 2D layers are packed orderly in an ABAB-type array via intermolecular interactions of the combined π-π stacking and O-H•••O hydrogen bonds to form 3D supramolecular architecture. Surprisingly, compound 1 exhibits water induced irreversible crystal-to-amorphous transformation with chromotropism confirmed by spectroscopic techniques, elemental analysis and XRPD. When this amorphous phase (1A) was exposed to the water vapor, it is readily converted into the second crystalline phase [Co(3,5-pyc)(H2O)4]n•H2O (2), in which 2 was also prepared directly by diffusion method and the structure was characterized by single-crystal X-ray diffraction technique. In case of compound 2, 3,5-pyc acts as didentate bridging ligand connecting two Co(II) ions, leading to the 1D zigzag chain. Guest water molecules are filled in between chains and form hydrogen bonds with host chains stabilizing 3D network of 2. Interestingly, compound 2 also exhibits water induced reversible crystal-to-amorphous transformation with chromotropism confirmed by spectroscopic techniques, elemental analysis, TGA and XRPD. |
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| Peer Review Status |
มีผู้ประเมินอิสระ |
| Level of Conference |
ชาติ |
| Type of Proceeding |
Abstract |
| Type of Presentation |
Poster |
| Part of thesis |
true |
| Presentation awarding |
false |
| Attach file |
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| Citation |
0
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Journal Publication
ไทย