Hydrogen-bonding patterns in 5-fluoro­cytosine–melamine co-crystal (4/1)

Acta Crystallographica Section E: Crystallographic Communications

Sanjeewa, L.D.¹  McMillen, C.D.¹  Mohana, M.²  Muthiah, P.T.² 

[1] Department of Chemistry, Clemson University, H. L. Hunter Laboratories, Clemson, SC 29634, USA;School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India

关键词: CRYSTAL STRUCTURE;    5-FLUOROCYTOSINE;    MELAMINE;    HOMOSYNTHONS;    HYDROGEN BONDING;   

DOI  :  10.1107/S205698901600476X

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

The asymmetric unit of the title compound, 4C4H4FN3O·C3H6N6, comprises of two independent 5-fluoro­cytosine (5FC) mol­ecules (A and B) and one half-mol­ecule of melamine (M). The other half of the melamine mol­ecule is generated by a twofold axis. 5FC mol­ecules A and B are linked through two different homosynthons [R22(8) ring motif]; one is formed via a pair of N—H⋯O hydrogen bonds and the second via a pair of N—H⋯N hydrogen bonds. In addition to this pairing, the O atoms of 5FC mol­ecules A and B inter­act with the N2 amino group on both sides of the melamine mol­ecule, forming a DDAA array of quadruple hydrogen bonds and generating a supra­molecular pattern. The 5FC (mol­ecules A and B) and two melamine mol­ecules inter­act via N—H⋯O, N—H⋯N and N—H⋯O, N—H⋯N, C—H⋯F hydrogen bonds forming R66(24) and R44(15) ring motifs. The crystal structure is further strengthened by C—H⋯F, C—F⋯π and π–π stacking inter­actions.

【 授权许可】

CC BY