Fluorescence of Zn–Al–Eu ternary layered hydroxide response to phenylalanine

Preparation and study of intumescent flame retardant poly(butylene succinate) using MgAlZnFe‐CO3 layered double hydroxide as a synergistic agent

“…The increase of lattice parameters suggests a distortion of the LDHs network induced in the process of Mg 2+ and Al 3+ being partially substituted for by Zn 2+ and Fe 3+ , respectively, resulting in some change in the octahedron structure, which centers on metal ions. This increased the layer plate thickness (lattice parameter c ) and the average distance between the metal ions (lattice parameter a ) . For example, the lattice parameters of 1# MgAlZnFe‐CO 3 LDHs increased by 17% in lattice parameter a , and 8% in lattice parameter c .…”

Phosphor Dysprosium‐Doped Layered Double Hydroxides Exchanged with Different Organic Functional Groups

“…The FTIR spectra of the organic intercalated LDHs presented in Figure 4 confirmed the presence of the corresponding anions in the LDH structures. All the products presented bands below 600 cm −1 corresponding to metaloxygen stretching modes of the inorganic layers [5,8,20,24]. The Asp and Ser derivatives showed a wide shoulder at 2900 cm −1 and a signal around 1600 cm −1 of stretching modes in the amino group and wide bands at 1380 and 1550 cm −1 of carboxylate stretching modes typical of amino acids [20,24].…”

“…Recently, the synthesis of LHDs doped with Eu 3+ occupying the M 3+ sites was achieved [5][6][7][8] despite its large cationic radius of 1.08Å in octahedral coordination [9], thus demonstrating the possibility to introduce large cations in the layers. The introduction of europium led to obtain LDHs with fluorescent properties [6-8, 10, 11].…”

“…The fluorescence due to europium in LDHs has also been introduced by intercalating anionic europium complexes in the interlayer space represented by A − in the general formula [10,12,13]; however, the first approach to produce fluorescent LDH is more attractive since the interlayer space is available for further exchange reactions [11]. This combination of fluorescence and intercalation properties in LDH structures has been proposed as an alternative to design drug delivery systems [6,8] that could be monitored through light emission techniques [14]. This strategy seems feasible owing to the chemical and thermal stability of the LDHs modified with molecules for medical or biological applications [15,16].…”

“…Another interesting application proposed for an europium-doped LDH is as a probe for phenylalanine detection considering that the light emission of europium into the layers shifts from the red to the blue region of the visible spectrum after the amino acid intercalation [8]. Even when this result did not correspond to a single crystalline phase compound, the change in luminescence induced by the substitution of ligands coordinating the europium centers was a novelty [8] considering that the electronic internal transitions in lanthanides should not be affected by ligands [17].…”