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A1:1 complex between the zwitterionic piperidinium-3-carboxylate (P3C) and p-hydroxybenzoic acid (HBA), P3C.HBA, has been characterized by single crystal X-ray analysis. The crystals are orthorhombic, space group Pbca, with a = 11.913(1), b = 9.407(1), c = 22.124(2) capital A, ring. There is a short O–HźźźO bridge (2.507(2) capital A, ring) connecting P3C with HBA. The proton is located at the benzoic acid carboxylate but the O–H bond is elongated (1.08capital A, ring) and the geometry of the COO groups suggests a nearly equivalent participation in this strong hydrogen bond. The piperidine ring adopts a chair conformation. The bulky carboxylate substituent takes an axial orientation in which it is stabilized by an intramolecular N+–HźźźO bond (2.880(2) capital A, ring). In the crystal packing, the P3CHBA units are connected with crystallographic neighbors by hydrogen bonds that involve only molecules of the same type. In this system of interactions, a zwitterionicmolecule attracts two zwitterionic neighbors via its two N+–H2 donors (accepted by the alternateO atoms of the carboxylate group; 2.823(2) and 2.841(2) ), while an aromatic molecule is connected to another aromatic molecule via a hydrogen bond of length 2.655(2) capital A, ring, involving the para-hydroxyl donor and the carbonyl acceptor of the carboxylic group. In a model optimized by the B3LYP/6-31G(d,p) method, P3C in its neutral form interacts via a C=OźźźHOOC hydrogen bond with HBA. The FTIR spectrum shows a broad absorption in the 3100–2400 cm–1 region attributed to niNH and niOH vibrations. The broad absorption in the 1495–910 cm–1 region is attributed to the short O(3)–HźźźO(1) hydrogen bond (niOH and gammaOH). The 1H and 13C NMR spectra have been analyzed to elucidate the complex structure in solution.
Wydawca
Czasopismo
Rocznik
Tom
Strony
931--946
Opis fizyczny
Bibliogr. 33 poz., rys.
Twórcy
autor
autor
autor
- Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland, degasz@amu.edu.pl
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUJ5-0014-0054
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