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Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(II) complexes with alkylated N3-Schiff bases

Abdullah, Norbani, Noor, Nur Linahafizza Md, Nordin, Abdul Rahman, Halcrow, Malcolm A., Macfarlane, Douglas R., Lazar, Manoj A., Pringle, Jennifer M., Bruce, Duncan W., Donnio, Bertrand and Heinrich, Benoit 2015, Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(II) complexes with alkylated N3-Schiff bases, Journal of materials chemistry C, vol. 3, no. 11, pp. 2491-2499, doi: 10.1039/c4tc02923b.

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Title Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(II) complexes with alkylated N3-Schiff bases
Author(s) Abdullah, Norbani
Noor, Nur Linahafizza Md
Nordin, Abdul Rahman
Halcrow, Malcolm A.
Macfarlane, Douglas R.
Lazar, Manoj A.
Pringle, Jennifer M.ORCID iD for Pringle, Jennifer M. orcid.org/0000-0002-2729-2838
Bruce, Duncan W.
Donnio, Bertrand
Heinrich, Benoit
Journal name Journal of materials chemistry C
Volume number 3
Issue number 11
Start page 2491
End page 2499
Total pages 9
Publisher Royal Society of Chemistry
Place of publication Cambridge, Eng.
Publication date 2015
ISSN 2050-7534
2050-7526
Summary Three new cobalt(ii) complexes, [Co(L12)2](BF4)2 (1), [Co(L14)2](BF4)2·H2O (2) and [Co(L16)2](BF4)2·H2O (3), where L12-16 are N3-Schiff bases appended with linear C12-16 carbon chains at the nitrogen atoms, were obtained in good yields by facile one-pot reactions. The single crystal X-ray structure of complex 1 shows a tetragonally compressed CoN6 coordination geometry. The melting temperatures of 1-3 were lower than 373 K, while their decomposition temperatures were above 473 K. All complexes have high-spin Co(ii) centres at 300 K and exhibit a columnar mesophase above 383 K. Complexes 1 and 3 showed normal thermal spin-crossover behaviour with weak hysteresis loops at about 320 K. Hence, these complexes showed uncoupled phase transitions (class iiia). The values for the Seebeck coefficient (Se) of the cobalt redox couples formed from 1 and 2 were 1.89 ± 0.02 mV K-1 and 1.92 ± 0.08 mV K-1, respectively, identifying them as potential thermoelectrochemical materials.
Language eng
DOI 10.1039/c4tc02923b
Field of Research 091205 Functional Materials
030304 Physical Chemistry of Materials
Socio Economic Objective 850599 Renewable Energy not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Royal Society of Chemistry
Persistent URL http://hdl.handle.net/10536/DRO/DU:30071567

Document type: Journal Article
Collection: Institute for Frontier Materials
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