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

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

Author: L. Li† , M. M. Turnbull, B. Twamley
Abstract

The low-temperature X-ray structure, and magnetic properties of (MePhenetNH2)2[CuBr4] (MePhenetNH2=N-methyl-2-
phenylethylammonium) (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).

Keywords: tetrabromocuprate, antiferromagnetism, crystal structure

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