Abstract
The reactions of 6-phosphononicotinic acid (pnaH3) and metal salts result in three new compounds, namely, M(pnaH)-(H2O)3·H2O [M = Co(II) (1), Ni(II) (2), Zn(II) (3)]. These compounds are isostructural and contain 21 helical chains made up of corner-sharing {MO5N} octahedra and {PO3C} tetrahedra. The chains are further connected by extensive hydrogen bonds to form a three-dimensional supramolecular structure. Magnetic studies reveal that dominant antiferromagnetic interactions are mediated in both 1 and 2. Interestingly the dehydrated compound 1 shows metamagnetic behavior at low temperature.
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Wang, P., Duan, Y. & Zheng, L. One-dimensional metal phosphonates based on 6-phosphononicotinic acid: A structural and magnetic study. Sci. China Chem. 53, 2112–2117 (2010). https://doi.org/10.1007/s11426-010-4097-6
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DOI: https://doi.org/10.1007/s11426-010-4097-6