Jesus Bueno, M. Melguizo, M. L. Quijano
Jul 15, 2003
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Journal
Acta crystallographica. Section C, Crystal structure communications
Abstract
The supramolecular structures of the isomeric compounds 5,7-dimethoxyimidazo[1,2-c]pyrimidine, C(8)H(9)N(3)O(2), (I), and 7-methoxy-1-methylimidazo[1,2-a]pyrimidin-5(1H)-one, C(8)H(9)N(3)O(2), (II), are determined by weak C-H.N and C-H.O hydrogen bonds in (I), which generate alternating linked centrosymmetric R(2)(2)(8) and R(2)(2)(10) rings that form a ribbon running parallel to the c axis, and by C-H.O bonds in (II), which link the molecules into sheets comprising centrosymmetric R(2)(2)(10) and R(4)(4)(22) rings.