The title compound was prepared by reacting pyrimethamine [2,4-diamino-5-(p-chlorophenyl)-6-ethyl pyrimidine] and picolinic acid, [C12H14ClN4, C6H4NO2] in methanol. It crystallizes in the monoclinic P21/c space group. The unit-cell parameters are a = 9.5731(2) b = 8.7449(2) c = 21.8582(5)Å, β = 99.9590(10)°. The final R-value is 0.0662 for 8517 measured reflections. The asymmetric unit contains a pyrimethamine cation and a picolinate anion. The protonated N1 atom is hydrogen bonded to one of the oxygen atoms via a N-H…O hydrogen bond. The carboxyl oxygen atom bridges the 2-amino group and the 4-amino group on either side in addition to the base pairing to form a DADA array (D = donor & A = acceptor in hydrogen bonding) of quadruple hydrogen bonding. The crystal structure is further stabilized by C-H…O, C-H…N and aromatic stacking interactions.
Figure 1 of the original article (Analytical Sciences: X-ray Structure Analysis Online, 24, x251) should be replaced with the following one.
The mononuclear complex [CuII(H4bzphen)]·CH3OH, [H6bzphen = N,N′-bis-2,3,4-trihydroxybenzylidene-1,2-phenylendiamine] was synthesized and characterized by single-crystal X-ray analysis. The compound crystallizes in the monoclinic system, space group P21/n and Z = 4 with cell parameters a = 14.601(14)Å, b = 8.574(3)Å, c = 15.953(9)Å, β = 109.49(8)°, V = 1882.8(21)Å3. H6bzphen acts as a tetradentate planar ligand, and the copper(II) has tetragonal planar geometry. The crystal packing is stabilized by inter-molecular π-π stacking interactions and hydrogen bonds.
The title compound was synthesized and its structure, [In(S2COPri)3] (C12H21InO3S6), Mr. = 520.51), was determined. The crystal is monoclinic, space group P21 with a = 18.989(5)Å, b = 11.164(3)Å, c = 10.497(5)Å, β = 90.51(3)°; final R = 0.0294. The complex comprises of an enantiomorphous pair of descrete [In(S2COPri)3].
The title compound, C16H12N2O2, consists of a nitro benzoato group fused to the a-face of the carbazole skeleton, in which the planar carbazole skeleton and benzene ring are also coplanar. It belongs to the space group P21/n with cell parameters a = 12.220(4), b = 6.9647(10), c = 15.304(3)Å and β = 97.414(3)°. Molecules are linked about inversion centres by N-H…O hydrogen bonds [N…O 2.965(5)Å] to form centrosymmetric dimers.
