On the intercalation of the iodine-iodide couple on layered double hydroxides with different particle sizes.
Molecular iodine was intercalated from nonaqueous solution into microsized ZnAl-layered double hydroxide (LDH) in the iodide form, generating the I(3)(-)/I(-) redox couple into the interlayer region. Chloroform, ethanol, acetonitrile, or diethyl ether were used as solvents to dissolve the molecular iodine. The intercalation compounds were characterized by thermogravimetric analysis, X-ray powder diffraction, UV-vis spectroscopy, and scanning and transmission electron microscopy. The stability of iodine-solvent adducts and the iodine concentration affected the LDH iodine loading, and samples with I(2)/I(-) molar ratio ranging from 0.14 to 0.82 were prepared. Nanosized, well dispersible LDH, synthesized by the urea method in water-ethylene glycol media, were also prepared and successfully functionalized with the I(3)(-)/I(-) redox couple applying the conditions optimized for the micrometric systems.
CEMIN Centro di Eccellenza Materiali Innovativi Nanostrutturati Dipartimento di Chimica, Università di Perugia Via Elce di Sotto 8 , I-06123 Perugia Italy.
Maria
M
Bastianini
Daniele
D
Costenaro
Chiara
C
Bisio
Leonardo
L
Marchese
Umberto
U
Costantino
Riccardo
R
Vivani
Morena
M
Nocchetti