Characterization, Crystal Structure, and Solution Studies of a Proton Transfer Compound Obtained from 2,6-Pyridinedicarboxylic Acid and 1,4,10,13-Tetraoxa-7,16-diazacyclooctadecane

• Autorzy: Moghimi A. , Lippolis V. , Aghabozorg H. , Shokrollahi A. , Shokrollahi A. , Sheshmani S. , Blake A.
• Języki publikacji: EN

Abstrakty

EN

The proton transfer compound, (DA18C6H2)(pydcH)2_0.25H2O, has been prepared from the reaction between 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane, diaza-18-crown-6 (DA18C6), and 2,6-pyridinedicarboxylic acid, dipicolinic acid (pydcH2). The characterization was performed using 1H and 13C NMR, IR spectroscopy and single crystal X-ray diffraction analysis. The asymmetric unit consists of one (DA18C6H2)2+ cation adopting a sigmoidal conformation which interacts with two (pydcH)- anions via hydrogen bonds involving the protonated amine groups of the diazacrown ether. -COOHźźź-OOC- head-to-tail hydrogen bonds generate 2D undulating layers along [100] and [001] in the crystal lattice. The protonation constants of DA18C6 and pydcH2 and equilibrium constants for the reaction of the two reactants were determined by potentiometric pH titration. The solution studies supported the formation also in solution of (DA18C6H2)(pydcH)2 as the most abundant species at pH = 3.4.

Słowa kluczowe

EN

2,6-pyridinedicarboxylic acid; diaza-18-crown-6; hydrogen bonds; crystal structure; solution studies

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2006
• Tom: Vol. 80, nr 8
• Strony: 1385--1396
• Opis fizyczny: Bibliogr. 28 poz., rys.

Twórcy

autor

Moghimi A.

autor

Lippolis V.

autor

Aghabozorg H.

autor

Shokrollahi A.

autor

Shokrollahi A.

autor

Sheshmani S.

autor

Blake A.

• Department of Chemistry, Imam Hossein University, Tehran, Iran

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