CRYSTAL-STRUCTURES OF 1,1'-DI(METHYLACETATO)-2,2'-BIIMIDAZOLE AND 1,1'-DI(CHLOROETHOXYETHYL)-2,2'-BIIMIDAZOLE

1,1'-Di(methylacetato)-2,2'-biimidazole, C12H14N4O4, crystallizes from methanol in the space group P2(1)/c, where a = 9.535(2), b = 13.385(2 ), c = 5.1208(8) Angstrom, V = 652.2(2) Angstrom(3), and Z = 4. 1,1'-D i(chloroethoxyethyl)-2,2'-biimidazole, C14H2OCl2N4O2, crystallizes fro m cyclohexane in the space group Pbca, where a = 12.372(2), b = 8.959( 2), c = 14.840(2) Angstrom, V = 1644.9(5) Angstrom(3), and Z = 8. The structures were refined to R = 0.041 (1380 observed reflections) and R = 0.043 (3243 observed reflections), respectively. Both molecules cry stallize with coplanar rings and the substituents assume a trans confi guration with a center of inversion between the bridging carbon atoms.