Abstract
The α crystalline form of p-aminobenzoic acid is monoclinic and prone to twinning by pseudo-merohedry (a ≈ c). A structure was reported by Lai and Marsh (1967) on an almost untwinned specimen where (a-c)/σ is 36. In revisiting this structure, a sample showing twinning was obtained from the metabolites of a Streptomyces strain collected from the soil at the ancient Roman city of Pollentia on the Balearic island of Mallorca. A 106(2) K determination shows pseudo-merohedral twinning, with a = 18.5452(6), b = 3.73406(15), c = 18.5484(7) Å, β = 93.790(3)°, V = 1281.65(8) Å3, and (a−c)/σ 5. The refinement included twin contributions [major domain 0.7435(15)] and produced a higher resolution structure determination. The cell contains two neutral molecules per asymmetric unit. Both form complementary carboxylic acid dimers across inversions centers of P21/n. Nitrogens are pyramidal and donate Hydrogen-bonds through one amine hydrogen; a stronger two-center N–H⋯O in one case, and a weaker three-center N–H⋯(O, O’) in the other. The molecular structure shows a pronounced quinoid distortion, and a comparison is drawn with the previous studies, an ordered β monoclinic phase, and with other structural studies.
Graphical Abstract
The α monoclinic phase of p-aminobenzoic acid crystallizes commonly as pseudo-merohedral twins, and a specimen studied at 106 K had a ≈ c within 5 esd’s, allowing an improved refinement and a more accurate molecular model.
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References
Eudes A, Bozzo GG, Waller JC, Naponelli V, Lim E-K, Bowles DJ, Gregory JF III, Hanson AD (2008) Metabolism of the folate precursor p-aminobenzoate in plants. Glucose ester formation and vacuolar storage. J Biol Chem 283:15451–15459
Wegkamp A, van Oorschot W, de Vos WM, Smid EJ (2007) Characterization of the role of para-aminobenzoic acid biosynthesis in folate production by Lactococcus lactis. Appl Environ Microbiol 73(8):2673–2681
Blanchard KC (1941) The isolation of p-aminobenzoic acid from yeast. J Biol Chem 131:919–926
Lai TF, Marsh RE (1967) The crystal structure of p-aminobenzoic acid. Acta Crystallogr A 22:885–889
Killean RCG, Tollin P (1965) Twinning in p-aminobenzoic acid. Acta Crystallogr A 19:482–483
Groth P (1917) Chemische Kristallographie, Teil 4 p. Verlag von Wilhelm Engelmann, Leipzig, p 509
Gracin S, Rasmuson AC (2004) Polymorphism and crystallization of p-aminobenzoic acid. Cryst Growth Des 4:1013–1023
Gracin S, Fischer A (2005) Redetermination of the beta-polymorph of p-aminobenzoic acid. Acta Crystallogr A E61:o1242–o1244
Sullivan RA, Davey RJ (2015) Concerning the crystal morphologies of the α and β polymorphs of p-aminobenzoic acid. CrystEngComm 17:1015–1023
Compagnon I, Antoine R, Rayane D, Broyer M, Dugourd P (2003) Permanent electric dipole of gas-phase p-aminobenzoic acid. J Phys Chem A 107:3036–3039
Yan T, Wang K, Duan D, Tan X, Liua B, Zou B (2014) p-Aminobenzoic acid polymorphs under high pressures. RSC Adv 4:15534–15541
Koa YG, Ma PX (2012) Growth of oriented p-aminobenzoic acid crystals by directional freezing. CrystEngComm 14(23):7891–7894
Athimoolan S, Natarajan S (2007) 4-Carboxyanilinium (2R,3R)-tartrate and a redetermination of the -polymorph of 4-aminobenzoic acid. Acta Crystallogr A C63:o514–o517
Kremer CB (1956) The laboratory synthesis of a simple vitamin: p-aminobenzoic acid. J Chem Educ 33(2):71–72
Toroz D, Rosbottom I, Turner TD, Corzo DMC, Hammond RB, Lai X, Roberts KJ (2015) Towards an understanding of the nucleation of α-p-aminobenzoic acid from ethanolic solutions: a multi-scale approach. Faraday Discuss 179:79–114
Sheldrick GM (2008) A short history of SHELX. Acta Crystallogr A A64:112–122
Herbst-Irmer R, Sheldrick GM (1998) Refinement of twinned structures with SHELXL97. Acta Crystallogr B54:443–449
Farrugia LJ (2012) WinGX and ORTEP for Windows: an update. J Appl Crystallogr 45:849–854
Mercury ver. 3.6. Cambridge Crystallographic Data Center (2015)
Black JFB, Davey RJ, Gowers RJ, Yeoh A (2015) Ostwald’s rule and enantiotropy: polymorph appearance in the crystallisation of p-aminobenzoic acid. CrystEngComm 17:5139–5142
Brown CJ (1968) The crystal structure of anthranilic acid. Proc R Soc A 302:185–189
Kumar SS, Nangia A (2014) A solubility comparison of neutral and zwitterionic polymorphs. Cryst Growth Des 14(4):1865–1881
Etter MC, MacDonald JC (1990) Graph-set analysis of Hydrogen-bond patterns in organic crystals. Acta Crystallogr A B46:256–262
Lago AF, Davalos JZ, deBrito AN (2007) A density functional and ab initio investigation of the p-aminobenzoic acid molecule. Chem Phys Lett 443:232–236
Bürgi H-B, Dunitz JD (1994) Structural correlation, vol 2, VCH Publishers, New York, pp 767–784
Schultz G, Portalone G, Ramondo F, Domenicano A, Hargittai I (1996) Molecular structure of aniline in the gaseous phase: a concerted study by electron diffraction and ab initio molecular orbital calculations. Struct Chem 7:59–71
Lister DG, Tyler JK, Tyler JH, Hog JH, Larsen NW (1974) The microwave spectrum, structure and dipole moment of aniline. J Mol Struct 23:253–264
Feld R, Lehmann MS, Muir KW, Speakman JC (1981) The crystal structure of benzoic acid: a redetermination with X-rays at room temperature. Zeitschrift fur Kristallographie 157(3/4):215–231
Wang Y, Saebø S, Pittman CU Jr (1992) The structure of aniline by ab initio studies. J Mol Struct 281(2–3):91–98
Acknowledgements
We thank the custodians of the Pollentia archeological site, Miguel Ángel Cau Ontiveros, Esther Chávez Álvarez, Fr. Richard Rutherford for access and guidance. We thank the University of Portland and the College of Arts and Sciences for summer research support for the Pollentia Undergraduate Research Expedition to Mallorca, Spain, and the National Science Foundation for support of crystallographic studies (MRI-0604188) and for LCMS equipment (MRI-0621648).
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Hoffman, A., Valente, E.J. Twinned α p-Aminobenzoic Acid at 106 K. J Chem Crystallogr 49, 58–64 (2019). https://doi.org/10.1007/s10870-019-00771-y
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DOI: https://doi.org/10.1007/s10870-019-00771-y