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PubMed2001

2-amino-4-(4-pyridyl)pyrimidine and the 1:1 adduct with 4-aminobenzoic acid.

The structure of the title compound, C9H8N4, comprises non-planar molecules that associate via pyrimidine N--H...N dimer R2(2)(8) hydrogen-bonding associations [N...N 3.1870 (17) A] and form linear hydrogen-bonded chains via a pyrimidine N--H...N(pyridyl) interaction [N...N 3.0295 (19) A]. The dihedral angle between the two rings is 24.57 (5) degrees. The structure of the 1:1 adduct with 4-aminobenzoic acid, C9H8N4*C7H7NO2, exhibits a hydrogen-bonding network involving COOH...N(pyridyl) [O...N 2.6406 (17) A], pyrimidine N--H...N [N...N 3.0737 (19) and 3.1755 (18) A] and acid N--H...O interactions [N...O 3.0609 (17) and 2.981 (2) A]. The dihedral angle between the two linked rings of the base is 38.49 (6) degrees and the carboxylic acid group binds to the stronger base group in contrast to the (less basic) complementary hydrogen-bonding site.

Journal Article↗
PubMed2000

Pre-column (hnu-HPLC) photochemical reaction for the on-line characterization of photoproducts using p-aminobenzoic acid as a model substance.

A special photochemical reactor on the basis of high-pressure resistant reaction coils has been constructed, which can be coupled to an HPLC-system before the separation column. By means of the so-called "on-line pre-column (hv-HPLC)"-method, the starting compounds can be irradiated on-line, the conversion products formed can be separated and detected subsequently. The efficiency of the proposed method was proved by using p-aminobenzoic acid (PABA) as a model substance.

Journal Article↗