Abstract
AbstractThe first examples of metal phosphonates based on 6‐phosphononicotinic acid (pnaH3), namely, M3(pna)2(H2O)2 {1: M = CuII, 2: M = CoII} are reported. Both possess pillared layered structures. Within the inorganic layer, chains made up of dimers of edge‐sharing {M2O6} octahedra and {M1O6} octahedra through O(1W), O–P–O, and O–C–O units are interconnected by {PO3C} tetrahedra. The pyridyl groups of pna3– serve as the pillars. An antiferromagnetic ground state is found for each compound. When the external field reaches critical points at low temperature, compound 1 features a spin flop transition, whereas 2 shows metamagnetic behavior.
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