Structures and mesomorphism of complexes of tetrakis(4-chlorobenzoate-μ-O,O′)bis(ethanol)dicopper(II) with different N-donor ligands

• Published in: Journal of coordination chemistry 2015-04, Vol.68 (8), p.1347-1360
• Main Authors: Abdullah, Norbani, Sharmin, Naima, Ozair, Lailatun Nazirah, Nordin, Abdul Rahman, Mohd. Nasir, Wan Siti Nasuha, Mohamadin, Mohammad Isa
• Format: Article
• Language: English
• Subjects: 2,2′-Bipyridine; 4-Chlorobenzoate; Copper(II); Covalence; Crystal; Crystallography; Cyclam; Ligands; Magnetic materials; Mesomorphism; Molecular structure; Pyridine; Pyridines; Single crystals; X-rays
• ISSN: 0095-8972; 1029-0389
• DOI: 10.1080/00958972.2015.1016428

Dimeric [Cu 2 (4-ClC 6 H 4 COO) 4 (EtOH) 2 ] (1) reacted with pyridine (pyr), 2,2′-bipyridine (bpy), and 1,4,8,11-tetraazacyclotetradecane (cyclam) to form mononuclear covalent complexes, [Cu(4-ClC 6 H 4 COO) 2 (pyr) 2 (H 2 O)] (2) and [Cu(4-ClC 6 H 4 COO) 2 (bpy)(H 2 O)] (3), and mononuclear ionic, [Cu(cyclam)(H 2 O) 2 ](4-ClC 6 H 4 COO) 2 (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. 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-ClC 6 H 4 COO) 2 (pyr) 2 (H 2 O)] and [Cu(4-ClC 6 H 4 COO) 2 (bpy)(H 2 O)], and mononuclear ionic complex, [Cu(cyclam)(H 2 O) 2 ](4-ClC 6 H 4 COO) 2 , respectively. Also reported are the mesomorphic properties of [Cu(4-ClC 6 H 4 COO) 2 (L) 2 (H 2 O)] and [Cu(cyclam)(L) 2 ](4-ClC 6 H 4 COO) 2 , where L = 4-hexadecyloxypyridine. These complexes are potential molecular magnetic materials with tunable properties.