Thermal and structural study on the lattice compound 1,4-diammoniumbutane bis(theophyllinate)

Margit Bán, J. Madarász, P. Bombicz, G. Pokol, Sándor Gál

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Crystalline title compound (1) prepared from aqueous solution of theophylline and 1,4-diaminobutane has been structurally and thermally characterized. Both the two-step TG decomposition curve and elemental analysis of the hexagonal crystals show that it consists of theophylline and 1,4-diaminobutane in 2:1 molar ratio. Actually, presence of one type of both theophyllinate anions and 1,4-diammoniumbutane dication have been indicated by FTIR spectroscopy. The molecular structure of lattice compound (1) has been determined by single crystal X-ray diffraction, where the hydrogen positions have been obtained from differential Fourier maps. It has confirmed that the crystal is really built up from these ionic constituents bound together with an extensive net of hydrogen bonds. The coupled TG-FTIR analysis of the evolved gases has revealed that the diamine is released as a whole molecule in the first decomposition step. Clathrate 1 and the proton migration in it might serve as a structural model of solid aminophylline whose crystal structure is still unknown.

Original languageEnglish
Pages (from-to)105-109
Number of pages5
JournalThermochimica Acta
Volume420
Issue number1-2 SPEC. ISS.
DOIs
Publication statusPublished - Oct 1 2004

Fingerprint

Putrescine
Theophylline
Crystal lattices
aminophylline
Decomposition
decomposition
Aminophylline
Crystals
Diamines
clathrates
diamines
Molecular structure
crystals
Anions
Protons
Hydrogen
Hydrogen bonds
molecular structure
Negative ions
Crystal structure

Keywords

  • Coupled TG-EGA-FTIR
  • Putrescine
  • Simultaneous TG-DTA
  • Single crystal X-ray diffraction
  • Theophylline

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Thermal and structural study on the lattice compound 1,4-diammoniumbutane bis(theophyllinate). / Bán, Margit; Madarász, J.; Bombicz, P.; Pokol, G.; Gál, Sándor.

In: Thermochimica Acta, Vol. 420, No. 1-2 SPEC. ISS., 01.10.2004, p. 105-109.

Research output: Contribution to journalArticle

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