Volume 58, Issue 8 pp. o817-o818

Hydro­gen-bonded supramolecular ribbons in the antifolate drug pyrimeth­amine

Velusamy Sethuraman

Velusamy Sethuraman

Department of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India

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Packianathan Thomas Mu­thiah

Packianathan Thomas Mu­thiah

Department of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India

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First published: 29 July 2004
Citations: 2
Packianathan Thomas Mu­thiah, e-mail: [email protected]

Abstract

In the crystal structure of pyrimeth­amine [2,4-di­amino-5-(p-chloro­phenyl)-6-ethyl­pyrimidine], C12H13ClN4, the asymmetric unit contains two crystallographically independent pyrimeth­amine molecules (A and B), differing in their conformations. The dihedral angle between the pyrimidine and the substituted phenyl plane is 74.4 (1)° in mol­ecule A and 82.4 (1)° in mol­ecule B. Molecule A is linked with mol­ecule B through a pair of N—H⋯N hydrogen bonds on one side and through another pair of N—H⋯N hydrogen bonds on the other side. Thus, there is a supramolecular ribbon, consisting of A and B molecules arranged in an alternating manner. Two such ribbons are connected centrosymmetrically through a pair of N—H⋯Cl bonds. These ABAB pairs and BABA interconnections lead to a supramolecular sheet-like structure.

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