Syntheses, Structures, and Properties of Two New Co(II) Coordination Frameworks Based on R-Isophthalate (R = –CH₃ or –OCH₃) and Two Flexible Bis(imidazol) Coligands

Abstract

Two new coordination polymers, {[Co(CH₃-ip)(1,4-bib)]· 2H₂O} _n (1) and {[Co(CH₃O-ip)(1,6-bih)]} _n (2) (CH₃-H₂ip = 5-methylisophthalic acid, CH₃O-H₂ip = 5-methoxyisophthalic acid, 1,4-bib = 1, 4-bis(imidazol-1-yl)butane, 1,6-bih = 1,6-bis(imidazol-1-yl)hexane), have been obtained under hydrothermal conditions. Complexes 1 and 2 were determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis and IR spectroscopy. Complex 1 shows a two-dimensional (2D) corrugated layer containing left and right-handed helical chains. Compound 2 exhibits a 2-fold parallel interpenetrated 2D → 2D net. Furthermore, thermogravimetric properties of 1 and 2 were also investigated.

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Keywords:

• 5-methylisophthalic acid
• 5-methoxyisophthalic acid
• 1
• 4-bis(imidazol-1-yl)butane
• 1
• 6-bis(imidazol-1-yl) hexane
• Co(II) complexes
• crystal structures

Acknowledgments

This work was supported financially by a key scientific and technological project of Henan Provincial Department of Science and Technology (No. 112102310640).