Abstract
In the title compound, [C14H19N4O3 +, C9H5 O2 −, H2O, O0.52] the asymmetric unit contains a protonated trimethoprim cation and a cinnamate anion and two water molecules. The crystal structure was determined by single crystal X-ray diffraction. This compound crystallized in the triclinic system; space group P−1 with the unit cell parameters a = 10.010(2) Å, b = 10.339(3) Å, c = 13.486(8) Å, α = 105.32(3)°, β = 109.88(3)°, γ = 100.89(3)°, V = 1204.6(10) Å3, Z = 2. The cinnamate group is disordered. The trimethoprim (TMP) molecule is protonated at one of the pyrimidine nitrogen atoms. The carboxylate group of the cinnamate anion interacts with the protonated pyrimidine atom N1 and the 2-amino group via a pair of N–H···O hydrogen bonds, generating the R 22 (8) ring motif. The inversion related TMP cations are paired via N–H···N hydrogen bonds. In addition to the base pairing, the O1W atom bridges the 2-amino and 4-amino groups on either side of the paired bases, resulting in a self complementary DADA array. Two inversion related TMP cations and water molecules (O1W) are linked via N–H···O and O–H···O hydrogen bonds, forming a 22 membered ring with graph-set R 44 (22).
Graphical Abstract
The protonated trimethoprim cation interacts with the cinnamate anion through a pair of N-H…O hydrogen bonds, generating the R 22 (8) ring motif.
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Acknowledgment
AS thanks Bharathidasan University, Tiruchirappalli, Tamil Nadu, India for the Award of a Research Studentship [Ref: CCCD/Ph.D-2/15504/2004].
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Subashini, A., Muthiah, P.T., Bocelli, G. et al. Hydrogen Bonding Patterns in Trimethoprimium Cinnamate 1.52 Hydrate. J Chem Crystallogr 41, 976–979 (2011). https://doi.org/10.1007/s10870-011-0028-4
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DOI: https://doi.org/10.1007/s10870-011-0028-4