Jump to main content
Jump to site search

Issue 11, 2015
Previous Article Next Article

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

Author affiliations

Abstract

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.

Graphical abstract: Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(ii) complexes with alkylated N3-Schiff bases

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Dec 2014, accepted on 18 Jan 2015 and first published on 21 Jan 2015


Article type: Paper
DOI: 10.1039/C4TC02923B
Author version
available:
Download author version (PDF)
J. Mater. Chem. C, 2015,3, 2491-2499

  •   Request permissions

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

    N. Abdullah, N. L. M. Noor, A. R. Nordin, M. A. Halcrow, D. R. MacFarlane, M. A. Lazar, J. M. Pringle, D. W. Bruce, B. Donnio and B. Heinrich, J. Mater. Chem. C, 2015, 3, 2491
    DOI: 10.1039/C4TC02923B

Search articles by author

Spotlight

Advertisements