Experimental results on phase transitions in betaine compounds

Schaack, G.

doi:10.1080/00150199008223819

Cited by 187 publications

(36 citation statements)

References 39 publications

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“…Monoclinic betaine phosphite CH 3 3 NCH 3 COO Á H 3 PO 3 belongs to a family of ferroelectric betaine compounds [1,2] with similar structures where the betaine molecules and the hydrogen bonds in the crystalline bonding dominate the physical properties [3]. However, the nature of the structural transitions varies from one compound to the other.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Anomalies in Deuterated Betaine Phosphite near the Ferroelectric Phase Transition

Samulionis

Banys

Völkel

et al. 1998

phys. stat. sol. (a)

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Section: Introductionmentioning

confidence: 99%

Ultrasonic Anomalies in Deuterated Betaine Phosphite near the Ferroelectric Phase Transition

Samulionis

Banys

Völkel

et al. 1998

phys. stat. sol. (a)

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confidence: 99%

Crystal structure of betaine potassium iodide dihydrate, (C5H11NO2)2KI·2H2O

Andrade

Costa

Paixão

et al. 1999

Zeitschrift Für Kristallographie - New Crystal Structures

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Betaine potassium iodide dihydrate,(C5H1 ιΝ02)2ΚΙ · 2Η2θ presents unique features amongst the rich variety of properties exhibited by the betaine family of compounds investigated in recent years [2][3][4][5][6]. The study of dielectric and pyroelectric properties provided evidence for a structural phase transition, probably of first order, occurring close to 100 Κ [7], Both iodine and potassium ions occupy special positions. Examination of the crystal structure shows that potassium ion is octahedrally coordinated by four oxygen atoms from betaine molecules in a plane close to (010) and by two water molecules. The iodine ion is bonded to the carboxylic group of the aminoacid by electrostatic interactions. Zigzag chains of water and betaine molecules linked via hydrogen bonds run throughout the structure. The carboxylic 02 atom is involved in a relatively strong hydrogen bond being an acceptor of the water molecule (0(3)-H31 0(2)', i = 2-x,-y,ì-Ζ, 2.654(3) Â) while the atom Ol is only involved in much weaker C-H-O interactions. This correlates well with the observed difference in the carboxylic C-0 bonds. Neighbouring water molecules are linked together via a weaker hydrogen bond (

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“…1 The crystals of many betaine complexes display interesting physical properties, exhibiting phase transitions with ferroelectric, antiferroelectric and ferroelastic behaviour. 2 Betaines have a variety of uses in medicine, pharmacy, biology and other scientific fields. 1 In this work, we investigated the 1 H and 13 C NMR spectra of N-methylpiperidine (1), N-methylpyrrolidine (4) and pyridine (6) betaines and their hydrogen halides (2, 5 and 7) (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%