NDLI: Stimuli-responsive hybrid materials: breathing in magnetic layered double hydroxides induced by a thermoresponsive molecule

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Stimuli-responsive hybrid materials: breathing in magnetic layered double hydroxides induced by a thermoresponsive molecule

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Chemical Science Vol - 6 Issue - 2

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Chemical Science Vol -1

Stimuli-responsive hybrid materials: breathing in magnetic layered double hydroxides induced by a thermoresponsive molecule

Content Provider	Royal Society of Chemistry (RSC)
Author	Gómez-Herrero, Julio Varela, María Jordá, Jose Luis Atienzar, Pedro Zamora, Félix Jaafar, Miriam Ribera, Antonio Coronado, Eugenio García, Hermenegildo Abellán, Gonzalo
Copyright Year	2015
Abstract	A hybrid magnetic multilayer material of micrometric size, with highly crystalline hexagonal crystals consisting of CoAl–LDH ferromagnetic layers intercalated with thermoresponsive 4-(4-anilinophenylazo)benzenesulfonate (AO5) molecules diluted (ratio 9 : 1) with a flexible sodium dodecylsulphate (SDS) surfactant has been obtained. The resulting material exhibits thermochromism attributable to the isomerization between the azo (prevalent at room temperature) and the hydrazone (favoured at higher temperatures) tautomers, leading to a thermomechanical response. In fact, these crystals exhibited thermally induced motion triggering remarkable changes in the crystal morphology and volume. In situ variable temperature XRD of these thin hybrids shows that the reversible change into the two tautomers is reflected in a shift of the position of the diffraction peaks at high temperatures towards lower interlayer spacing for the hydrazone form, as well as a broadening of the peaks reflecting lower crystallinity and ordering due to non-uniform spacing between the layers. These structural variations between room temperature (basal spacing (BS) = 25.91 Å) and 100 °C (BS = 25.05 Å) are also reflected in the magnetic properties of the layered double hydroxide (LDH) due to the variation of the magnetic coupling between the layers. Overall, our study constitutes one of the few examples showing fully reversible thermo-responsive breathing in a 2D hybrid material. In addition, the magnetic response of the hybrid can be modulated due to the thermotropism of the organic component that, by influencing the distance and in-plane correlation of the inorganic LDH, modulates the magnetism of the CoAl–LDH sheets in a certain range.
Starting Page	1949
Ending Page	1958
Page Count	10
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	6
Issue Number	3
Journal	Chemical Science
DOI	10.1039/c4sc03460k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	SDS Isomerization Thermotropism Lactate dehydrogenase Benzenesulfonic acid Surfactant Thermochromism Layered double hydroxides X-ray crystallography LDH Azo compound Diffraction Sodium Ferromagnetism Hydrazone
Content Type	Text
Resource Type	Article
Subject	Chemistry

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