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This article reports the synthesis and paddle-wheel structure of [Cu 2 (4-ClC 6 H 4 COO) 4 (EtOH) 2 ], and its reaction with pyridine (pyr), 2,2′-bipyridine (bpy), and 1,4,8,11-tetraazacyclotetradecane (cyclam) to form mononuclear covalent complexes, [Cu(4(4), respectively. The molecular structures of 2 and 3 were determined by single-crystal X-ray crystallography. Complexes 1 and 4 then reacted with 4-hexadecyloxypyridine (L) to form mesomorphic complexes, [Cu(4-ClC 6 H 4 COO) 2 (L) 2 (H 2 O)] (5) and [Cu (cyclam)(L) 2 ](4-ClC 6 H 4 COO) 2 (6), respectively. These complexes are potential molecular magnetic materials with tunable properties.

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