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Abstract
Hydrothermal reactions of 1-aminoethylidenediphosphonic acid (AEDPH4), Ni(OH)2 and ammonium counterions afforded two nickel phosphonate compounds, (enH2)3[Ni(AEDP)2] · 6H2O (1) and (NH4)6[Ni(AEDP)2] · 4H2O (2) (en = ethylenediamine). Compounds 1 and 2 both contain [Ni(AEDP)2]6− while having different three-dimensional (3-D) supramolecular structures. In 1, the [Ni(AEDP)2]6− anion and cations interconnected via various hydrogen bonds and form a 3-D porous supramolecular network with extended one-dimensional channels, in which an interesting T4(2)6(2) water tape penetrates. Compared to 1, the [Ni(AEDP)2]6− anion and
cations in 2 constitute an enclosed 3-D supramolecular framework without obvious channels; two water-ammonium clusters with different structural motifs are observed. The magnetism of 1 exhibits weak antiferromagnetic interaction via the hydrogen bonds. The effect of protonated ammonium counterions on the structural types of the final products is also discussed.
Acknowledgement
This work was supported by grants of the National Nature Science Foundation of China (No. 20671074).
