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
Document Type
Article
Publication Date
6-18-2021
Abstract
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.
Keywords
Copper(II) 4-halobenzoates, 2, 2'-bipyridine, 4, 4'-bis(dodecyl)-2, 2'-bipyridine, crystals, Mesomorphisms
Divisions
CHEMISTRY
Funders
Malaysia Ministry of Education for High Impact Research Grant (UM.C/625/1/HIR/MOHE/05),Fundamental Research Grant Scheme (FP031-2013B),Universiti Malaya (PG023-2013A),Universiti Malaya (PG083-2014A)
Publication Title
Journal of Coordination Chemistry
Volume
74
Issue
12
Publisher
Taylor & Francis
Publisher Location
2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND