Journal
JOURNAL OF COORDINATION CHEMISTRY
Volume 74, Issue 12, Pages 1947-1964Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2021.1940980
Keywords
Copper(II) 4-halobenzoates; 2; 2'-bipyridine; 4; 4'-bis(dodecyl)-2; 2'-bipyridine; crystals; mesomorphisms
Categories
Funding
- Malaysia Ministry of Education for High Impact Research Grant [UM.C/625/1/HIR/MOHE/05]
- Fundamental Research Grant Scheme [FP031-2013B]
- University of Malaya [PG023-2013A, PG083-2014A]
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In this study, various mononuclear and dinuclear complexes were synthesized by reacting different ligands with copper ions, exhibiting diverse characteristics in terms of crystal structures and thermotropic mesomorphic properties.
[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.
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