Sarcosine-maleic acid (1:1) crystal: structure, 13C NMR and vibrational properties, protonation character.
The crystal structure of sarcosine-maleic acid (1:1) complex has been determined by X-ray diffraction method at 293 K as monoclinic, space group C2/c, Z=8. The crystal unit consists of semi-maleate and sarcosinium ions with two strong hydrogen bonds: the intramolecular one in the maleic part of the complex and the intermolecular one between sarcosinium and semi-maleate carboxylic groups. Phase transitions in this crystal are excluded. Its structure is in accordance with FT-IR, FT-Raman and 13C NMR study. Properties of the titled crystal and a family of similar amino acid-maleic acid systems are compared and discussed. Special attention is paid for relations between different structural and spectroscopic parameters as well as for character of hydrogen bonds formed in these crystalline complexes.
Faculty of Chemistry, University of Wrocław, Joliot-Curie 14, 50-383 Wroclaw, Poland. mi@wchuwr.chem.uni.wroc.pl
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D002152:Calorimetry, Differential Scanning; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008298:Maleates / Q000737:chemistry*; D008958:Models, Molecular; D011522:Protons; D012521:Sarcosine / Q000737:chemistry*; D014961:X-Ray Diffraction
D008298:Maleates; D011522:Protons; C030272:maleic acid; D012521:Sarcosine