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<p>(two directions, × and y axes); and a three-dimensional structure extends in all three directions (x, y, and z axes). This is depicted in Figure 1.</p>

<p><big>History</big></p>
<p>The work of <a href="page.php?w=Alfred_Werner">Alfred Werner</a> and his contemporaries laid the groundwork for the study of coordination polymers. Many time-honored materials are now recognized as coordination polymers.  These include the cyanide complexes <a href="page.php?w=Prussian_blue">Prussian blue</a> and <a href="page.php?w=Hofmann_clathrates">Hofmann clathrates</a>.</p><p>
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