Abstract
The crystal structure of MgC 2 is solved from powder X-ray and neutron diffraction data. Magnesium dicarbide is synthesized from Mg powder and ethyne, with yields of up to 40 wt.% (balance: unreacted Mg and MgO). The X-ray pattern is indexed on a tetragonal unit cell, with space group P4 2/ mnm suggested from systematic extinctions. The unit cell refined from the powder neutron diffraction data has a=3.9342(7) and c=5.021(1) Å and Z=2. The crystal structure contains C 2 groups, with a triple-bond length of 1.215(6) Å, aligned in …MgCCMgCCMg… chains having Mg–C bond lengths of 2.174(4) Å and a weak interaction [2.510(1) Å] between Mg and the triple bond of the crossing chains above and below.
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