Abdullah, N. and Said, S.M. and Halid, Y.Y. and Megat Hasnan, M.M.I. and Sharmin, N. and Mat Hussin, S.A. and Nik Ibrahim, N.M.J. and Nordin, A.R. and Safiin, N.A. and Anuar, N.S. (2016) Complexes of nickel(II) carboxylates with pyridine and cyclam: crystal structures, mesomorphisms, and thermoelectrical properties. Journal of Coordination Chemistry, 69 (19). pp. 2954-2971. ISSN 0095-8972, DOI https://doi.org/10.1080/00958972.2016.1221504.
Full text not available from this repository.Abstract
Nickel(II) carboxylates [Ni(CH3(CH2)14COO)2(H2O)2] (1) and [Ni(C6H5COO)2(H2O)2] (2) were obtained from reactions of NiCl2·6H2O with CH3(CH2)14COONa and C6H5COONa, respectively. Complex 1 reacted with pyridine (pyr) to form [Ni(CH3(CH2)14COO)2(pyr)2(H2O)2] (3) and [Ni2(μ2-H2O)(CH3(CH2)14COO)4(pyr)4] (4) in the same reaction mixture, and reacted with cyclam to form an ionic complex, [Ni(CH3(CH2)14COO)(cyclam)(H2O)]CH3(CH2)14COO·4H2O (5). In contrast, 2 reacted with cyclam to form [Ni(C6H5COO)2(cyclam)] (6). Finally, 6 reacted with p-(hexadecyloxy)pyridine (L) to form an ionic complex, [Ni(cyclam)(L)2](C6H5COO)2 (7). Complexes 3–6 were single crystals. All complexes have octahedral Ni(II) center(s) and were magnetic. Complexes with cyclam as co-ligand were more thermally stable than those with pyridine and its derivative, L. Complexes 3 and 4 were mesomorphic after partial loss of water and/or pyridine ligands on heating. The ionic complexes 5 and 7 were not mesomorphic, but showed good thermoelectrical behavior with negative Se values in CHCl3 (−0.28 mV K−1 for 5; -0.39 mV K−1 for 7) and positive Se values in C2H5OH (+0.25 mV K−1 for 5; +0.20 mV K−1 for 7).
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | Nickel(II) carboxylates; Pyridine; Cyclam; Mesomorphism; Thermoelectricity |
| Subjects: | Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Divisions: | Faculty of Science > Department of Chemistry |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 12 Oct 2017 06:46 |
| Last Modified: | 12 Oct 2017 06:46 |
| URI: | http://eprints.um.edu.my/id/eprint/17994 |
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