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Combined Fourier-transform (FT) IR and X-ray absorption fine structure (XAFS) studies of NiBr2 isolated in a nitrogen matrix have shown that it is non-linear (125° FTIR, 145° XAFS), with the shortest Ni–Nmatrix interaction at 2.61 Å, compared to a linear geometry in a methane matrix.
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Nigel A. Young (1996) studied this question.
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