Acta Crystallographica Section C

Crystal Structure Communications

Volume 59, Part 1 (January 2003)

organic compounds

Acta Cryst. (2003). C59, o4-o8 [ doi:10.1107/S0108270102020012 ]

Two polymorphs, with Z' = 1 and 2, of 2-amino-4-chloro-6-morpholinopyrimidine in P2₁/c, and 2-amino-4-chloro-6-piperidinopyrimidine, which is isomorphous and almost isostructural with the Z' = 2 polymorph

K. F. Bowes, C. Glidewell, J. N. Low, M. Melguizo and A. Quesada

Abstract: Crystallization of 2-amino-4-chloro-6-morpholinopyrimidine, C₈H₁₁ClN₄O, (I), yields two polymorphs, both with space group P2₁/c, having Z' = 1 (from diethyl ether solution) and Z' = 2 (from dichloromethane solution), denoted (Ia) and (Ib), respectively. In polymorph (Ia), the molecules are linked by an N-HO and an N-HN hydrogen bond into sheets built from alternating R(8) and R(40) rings. In polymorph (Ib), one molecule acts as a triple acceptor of hydrogen bonds and the other acts as a single acceptor; one N-HO and three N-HN hydrogen bonds link the molecules in a complex chain containing two types of R(8) and one type of R(18) ring. 2-Amino-4-chloro-6-piperidinopyrimidine, C₉H₁₃ClN₄, (II), which is isomorphous with polymorph (Ib), also has Z' = 2 in P2₁/c, and the molecules are linked by three N-HN hydrogen bonds into a centrosymmetric four-molecule aggregate containing three R(8) rings.

Formula: Two polymorphs of C₈H₁₁ClN₄O, and C₉H₁₃ClN₄


	Structure factor file (CIF format) (103.4 kbytes) Contains datablock Ia

	Structure factor file (CIF format) (213.0 kbytes) Contains datablock Ib

	Structure factor file (CIF format) (222.1 kbytes) Contains datablock II

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