LOW TEMPERATURE CRYSTAL STRUCTURE AND MAGNETIC BEHAVIOR OF BIS(N-METHYL-2-PHENYLETHYLAMININIUM) TETRABROMIDOCUPRATE

Li Lixin, Mark M. Turnbull, Brendan Twamley

Abstract


The low-temperature X-ray structure, and magnetic properties of (MePhenetNH2)2[CuBr4](MePhenetNH2 = N-methylphenylethylammonium)(1)are reported. The compound was characterized using IR, combustion analysis, X-ray powder diffraction, single crystal X-ray diffraction, and temperature-dependent magnetic susceptibility measurements. Compound 1 crystallizes in the monoclinic space group C2/c. In the structure, the tetrabromidocuprate ions are packed into zig-zag chains parallel to the c-axis which are stabilized by hydrogen bonds between the ammonium cations and bromide anions. Magnetic measurements (1.8-310 K) indicate weak antiferromagnetic interactions propagated via the two-halide exchange pathway through short Br…Br contacts.  Fitting the data with the S = ½ uniform chain model gave J = -7.7(1) K with C = 0.403(1).

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DOI: http://dx.doi.org/10.17628/ecb.2019.8.%25p

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