Structural variability and thermally-induced mesomorphisms in complexes of copper(II) with 4-halobenzoates, 2,2'-bipyridine and 4,4'-bis(dodecyl)-2,2'-bipyridine

• Main Authors: Abdullah, Norbani, Ozair, Lailatun N., Samsudin, Habibah, Tizzard, Graham J., Coles, Simon J., Mohamadin, Mohammad
• Format: Article
• Published: Taylor & Francis 2021
• Subjects: QD Chemistry
• Online Access: http://eprints.um.edu.my/28502/
• Institution: Universiti Malaya

Cu-2(4-XC6H4COO)(4)(C2H5OH)(2)] (X = F, Br) reacted with 2,2 `-bipyridine (bpy) to form mononuclear complexes Cu(4-FC6H4COO)(2) (bpy)(H2O)] (1) and Cu(4-BrC6H4COO)(2)(bpy)(H2O)]center dot H2O (2), respectively. These complexes formed single crystals. Complex 1 crystallized in the orthorhombic Pccn space group, while 2 crystallized in the triclinic P-1 space group. In addition, Cu-2(4-XC6H4COO)(4)(C2H5OH)(2)] (X = F, Cl, Br, I) reacted with 4,4'-bis(dodecyl)-2,2'-bipyridine (L) to form mononuclear complexes Cu(4-FC6H4COO)(2)(L)]center dot H2O (3), Cu(4-ClC6H4COO)(2)(L)]center dot 1/2H(2)O (4) and Cu(4-BrC6H4COO)(2)(L)]center dot 1/2H(2)O (5), and a dinuclear complex, Cu-2(4-IC6H4COO)(4)(L)(2)] (6), respectively. Complex 3 was a semisolid at room temperature, while 4-6 formed single crystals. Complexes 4 and 5 crystallized in the triclinic P-1 space group, while 6 crystallized in the monoclinic P2(1)/c space group. Complexes 4-6 suffered structural changes on heating to form dinuclear thermotropic metallomesogenic complexes. The electronic effect of halogens and linear alkyl chains were studied towards their molecular structures and mesomorphisms.