Abstract
The 1∶1 crystal complex of salicylic acid (C7H6O3) and urea (CH4N2O), mp 121° C, is monoclinic, with space groupC2/c (C 2 6 h, No. 15) and unit cell dimensionsa=22.206(3),b=5.108(1),c=17.177(2) A,β=106.18(1)°.d calc=1.407 g cm−3,d meas=1.41 g cm−3 forZ=8. The structure was determined by direct methods and refined by a full-matrix least-squares procedure to giveR=0.057 andR w =0.050 for 1652 integrated intensities above 2σ(I). The structure contains a strong OH⋯O hydrogen bond with O⋯O distance 2.54 A in which the carboxyl OH group is donor and urea oxygen atom is acceptor. There are two NH⋯O intermolecular hydrogen bonds with N⋯O distances of 2.90 and 2.96 A. Additionally, the salicyclic acid contains an intramolecular OH⋯O hydrogen bond of 2.56 A.
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