The radical units Se(2)N(2)CMe dimerize with long Se...Se distances of
3.159 (3) and 3.187 (3) Angstrom to give the title compound, C4H6N4Se
4. There are two crystallographically independent dimers in the unit c
ell. The dimers adopt a twisted conformation with parallel ring planes
. One ring is rotated on the axis between ring centers by approximatel
y 90 degrees from the eclipsed position to give Se-Se-Se-Se torsion an
gles of 86.81 (15) and 88.95 (17)degrees. Se-Se bond lengths within th
e radicals vary from 2.306 (3) to 2.330 (3) Angstrom.