Synthesis, structure and ferromagnetic properties of a copper(II) coordination polymer with azide and 4-pyridylacrylate

A Cu(II) complex with azide and 4-pyridylacrylic acid (4-Hpya), [Cu2(4-pya)2(N3)2(DMF)2] (1) has been synthesized and characterized crystallographically and spectroscopically. This compound consists of binuclear units in which Cu(II) ions are connected through two equatorial–equatorial end-on azido bridges. The Cu(II) dimers are interlinked by 4-pya to generate two-dimensional coordination polymers. Magnetic investigations revealed a relatively strong ferromagnetic interaction through the azide bridges with J = 145 cm−1, and a weak ferromagnetic interdimer interaction through the long but π-conjugated 4-pya ligands. The magneto-structural correlations have been discussed in comparison with other Cu(II) dimers with the same bridging motif.

Graphical abstractA 2D coordination polymer in which Cu(II) dimers with double EO azide bridges are interlinked by 4-pyridylacrylate exhibit intra- and interdimer ferromagnetic interactions mediated through the azide bridge and the organic ligand, respectively.Figure optionsDownload full-size imageDownload as PowerPoint slide