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The tetraethylammonium tetramethylammonium tetrabromocuprate(II), (hereafter, [(TEA)(TMA)CuBr 4 ]) [(C 2 H 5 ) 4 N][(CH 3 ) 4 N][CuBr 4 ], complex was synthesized and characterized by spectroscopic (IR), structural (XRD) and electron paramagnetic resonance (EPR) technique. The compound contains four isolated and discrete moieties,  i.e . two independent [(CH 3 ) 4 N] +  cations, with one on a -4 axis and the other with the central N atom on a 2  z   axis, one [(C 2 H 5 ) 4 N]] +  cation, on a mirror plane and in a trans conformation, and one distorted tetrahedral [CuBr 4 ] 2–  anion on another mirror plane. The electron paramagnetic resonance spectra of [(TEA)(TMA)CuBr 4 ] single crystals and powder were investigated in the temperature range from 300 to 5 K. The observed values from the line width and g tensors were found to be temperature dependent. The temperature dependence of Cu(II) complex with EPR spectra values were also discussed in terms of dynamic Jahn-Teller effect.

Structural, spectroscopic and EPR studies of tetraethylammonium tetramethylammonium tetrabomocuprate (II) complex