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crystal data
The thermal expansion tensor of pyrazine(1,4-diazabenzene, C4H4N2) has been calculated from the changes of the lattice constants with temperature, as measured with X-ray diffraction. The elements of the thermal expansion tensor at 293 K are αa = −14 (3), αb = 111 (5) and αc = 246 (3) x 10−6°K−1