NDLI: 2D–1D structural phase transformation of Co(II) 3,5-pyridinedicarboxylate frameworks with chromotropism

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Cheansirisomboon, Achareeya Youngme, Sujittra Pakawatchai, Chaveng
Description	Author Affiliation: Cheansirisomboon A ( Materials Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.)
Abstract	Two new metal–organic frameworks $[Co(pydc)(H_{2}O)_{2}]_{n}$ (1) and $[Co(pydc)(H_{2}O)_{4}]_{n}(H_{2}O)_{n}$ (2), (pydc = 3,5-pyridinedicarboxylate) have been synthesized by a diffusion method and characterized by single-crystal X-ray diffraction . The structure of 1 reveals an infinite 2D layer with honeycomb-like cavities in which each pydc ligand bridges three Co(II) ions. The adjacent 2D layers are orderly packed in an ABAB-type array via intermolecular interactions of the combined π–π stacking and hydrogen bonds to form a 3D supramolecular architecture. Interestingly, compound 1 exhibits a water induced crystal-to-amorphous transformation with chromotropism confirmed by spectroscopic techniques, elemental analysis , TGA and XRPD . When this amorphous phase (1A) was exposed to water vapor, it was readily converted into the second crystalline phase 1B with a color change. Moreover, a reversible process between 1A and 1B was performed. In the case of compound 2, pydc acts as didentate bridging ligand connecting two Co(II) ions, leading to a 1D zig-zag chain. Guest water molecules fill the gaps in between chains and form hydrogen bonds with the host chains stabilizing the 3D network of 2. Additionally, compound 2 also exhibits a water induced crystal-to-amorphous transformation with chromotropism and the reversible process was also performed between the dehydrated (2A) and rehydrated (2′) forms. Surprisingly, the IR and UV-vis spectra , elemental analysis , TGA curve and XRPD pattern of the rehydrated second phase 1B are found to be identical to that of 2 and 2′, these results confirm that 2, 2′ and 1B are the same compound.
ISSN	14779226
Issue Number	35
Journal	Dalton Trans.
Volume Number	41
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2012-09-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Cobalt Chemistry Coordination Complexes Chemical Synthesis Crystallography, X-Ray Hydrogen Bonding Molecular Conformation Journal Article
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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