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The crystals of {[Cu(bapa)]3[Cr(CN)6]2}n.6nH2O (bapa = bis(3-aminopropyl)amine) are formed by infinite Cu(II)–Cr(III) antiparallel chains, which are connected into the third direction by additive [Cu(bapa)] moieties. The temperature dependence of susceptibility, field dependence of magnetization and EPR spectra of complex are influenced by the presence of strong ferromagnetic exchange interaction between Cu(II) and Cr(III) ions (J/kB = 63 K). The onset of long-range magnetic order at 3 K was observed by AC susceptibility. The study of the magnetocaloric effect from magnetization measurements in title complex is presented. At low temperature a large entropy change at 4 K was observed with peak value −∆SM = 13.1 J.K−1.mol−1 (-∆SM = 11.8 J.kg−1.K−1) at field change from 0 T to 3 T.

The Magnetocaloric Effect in {[Cu(bapa)]3[Cr(CN)6]2}n · 6n H2O at Low Temperatures