Formation of Zn–Al layered double hydroxide thin films intercalated with sulfonated spiropyran

Abstract

We prepared Zn-Al layered double hydroxide (LDH) thin films intercalated with sulfonated 1,3 0 ,3 0 -trimethyl-6-nitrospiro[2H-chromene-2,2 0 -indoline] anions (SP-SO 3 -) by immersion of sol-gel derived amorphous Al 2 O 3 -ZnO thin films in hot water containing SP-SO 3 H. Extended interlayer spacing, in comparison to the Zn-Al LDH with carbonate anions, was observed after immersion in distilled water containing SP-SO 3 H at 60°C for 30 min, indicating that we formed Zn-Al LDH films with SP-SO 3 -directly on glass substrates. The merocyanine form of SP-SO 3 -was shown by UV spectra to have stabilized in the hydroxide layers of LDH.

Ultrasonic-assisted synthesis and characterization of layered double hydroxides intercalated with bioactive N,N′-(pyromellitoyl)-bis-l-α-amino acids

“…and A nÀ is an exchangeable anion with charge n. [12][13][14][15][16] Recently, LDHs have received signicant attention due to their various applications in catalysts, optics, anion-exchangers, bio sensors, corrosion resistance lms and so on. [17][18][19] Unlike cationic clays, LDHs could be modied with anionic surfactants. This issue is important because there is a wide range of choice for surfactants, for example F. R. Costa et al used from dodecylsulfate, dodecyl benzenesulfonate, laurate and bis(2-ethylhexyl)hydrogenphosphate anions for modication of LDH.…”