Abstract
Magnetothermal properties of high-spin chloro(2,3,7,8,12,13,17,18-octaethylporphyrinato)manganese(III), chloro(5,10,15,20-tetraphenylporphyrinato) manganese(III), bromo(5,10,15,20-tetraphenylporphyrinato)manganese(III), and (acetato)(5,10,15,20-tetraphenylporphyrinato)manganese(III) complexes as 6% water suspensions were determined by the microcalorimetric method at 298 K in a magnetic field of 0–1.0 T. It was established that when the magnetic field was applied, the temperature of the systems increases, leading to positive values of the magnetocaloric effect: the higher the magnetic field induction, the higher the values. It is shown that the dependences of the heat capacity of the complexes’ solid particles on the magnetic field induction are of an extreme nature with a heat capacity in the area above 0.6 T less than that in the zero field. The regularities of the dynamics of the numerical values of the change in enthalpy and magnetic entropy of the manganese complexes when a growing magnetic field was applied and the regularities of the influence of the acidoligand in pentacoordinated complexes on their magnetothermal properties were considered.
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Original Russian Text © V.V. Korolev, I.M. Aref’ev, T.N. Lomova, M.E. Klyueva, A.G. Zakharov, D.V. Korolev, 2010, published in Zhurnal Fizicheskoi Khimii, 2010, Vol. 84, No. 9, pp. 1785–1790.
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Korolev, V.V., Aref’ev, I.M., Lomova, T.N. et al. Magnetocaloric effect and heat capacity of high-spin manganese complexes in a disperse state. Russ. J. Phys. Chem. 84, 1631–1635 (2010). https://doi.org/10.1134/S0036024410090335
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DOI: https://doi.org/10.1134/S0036024410090335