Enhanced Tb3+ luminescence in layered terbium hydroxide by intercalation of benzenepolycarboxylic species

Abstract

We herein demonstrate the intercalation of several organic benzenepolycarboxylic compounds, terephthalic acid (TC), 1,3,5-benzenetricarboxylic acid (BTC) and 1,2,4,5-benzenetetracarboxylic acid (BTCC), into the layered terbium hydroxide (LTbH) and the sensitized luminescence of these organic species for the layer Tb 3+. All of the as-prepared products demonstrated characteristic XRD diffractions attributed to layered materials. Compared with the NO 3-LTbH precursor, efficient energy transfer from intercalated organic anions to Tb 3+ centers in LTbH layers took place, thus markedly enhancing the Tb 3+ luminescence. The relationship between the triplet energy levels of the organic guests and the energy level of Tb 3+ was analyzed to explain the sensitization effect and energy transfer from the gallery sensitizers to the layer Tb 3+ ions. The fluorescence lifetimes of NO 3-LTbH, TC-LTbH, BTC-LTbH and BTCC-LTbH were determined to be 0.131, 0.315, 0.579 and 0.642 ms, respectively, indicating significantly increased lifetimes of the LTbH composites intercalated with the organic species.

Orientation of (Hetero)aromatic Anions in the LEuH Interlayer and Enhanced Photoluminescence

“…NA – and CA – are in a vertical bilayer arrangement in the interlayer (Scheme h,i), the same as those for other aromatic anions reported. − No marked agostic interaction between the metal and a C–H bond is observed, indicating that the transition metal is well coordinatively saturated.…”

“…So far, the sensitizers of benzoic acids/derivatives − and coumarin acids/derivatives, characterized with a conjugated structure, were extensively reported among the organic intercalates (Table S1, Supporting Information). These organic sensitizers exhibited a PL enhancing effect of the rare-earth ions in LRHs, which may be due to energy level matching, the same as that found in rare-earth metal complexes .…”

Luminescence Tuning of Layered Rare-Earth Hydroxides (LRHs, R = Tb, Y) Composites with 3-Hydroxy-2-naphthoic Acid and Application to the Fluorescent Detection of Al3+

“…[5][6][7]12 Less attention has been given to the luminescence resulting from the interlayer guests or synergetic interactions of the guests with the layered host. 9,10,15 The facile delamination method involving the anion surfactant of 1-octanesulfonic acid sodium (abbreviated OS) that we previously reported 10 luminescence properties [8][9][10]13,15 and expanded the applications:, for example, luminescence sensing. 12,16 Currently, metal ion pollution has caused a serious threat to human health and living organisms.…”

“…Up to now, due to multiple applications including selective catalytic oxidation, anion exchangers, fluorescent sensors, and photochemical materials, significant attention has been focused on interlayer chemistry. Organic–inorganic hybrids of layered rare-earth hydroxides (LRHs), due to the energy transfer or synergetic effect between the inorganic layered hosts and interlayered organic species, not only improve the stability of organic dyes but also exhibit novel photoluminescence behavior. − There are numerous reports referring to organic– and inorganic–LRH hybrids; − most of them have focused on the luminescence of the individual components such as layered Eu 3+ and Tb 3+ . − , Less attention has been given to the luminescence resulting from the interlayer guests or synergetic interactions of the guests with the layered host. ,, The facile delamination method involving the anion surfactant of 1-octanesulfonic acid sodium (abbreviated OS) that we previously reported has opened the way to achieve LRH colloidal materials showing particular luminescence properties − ,, and expanded the applications:, for example, luminescence sensing. , …”

Honeycomb-patterned porous films fabricated via self-organization of Tb complex-loaded amphiphilic copolymers

“…The C O stretching vibration observed at 1658 cm −1 showed a significant red shifts compared with that of pure PMA (1695 cm −1 ), which was the result of the deprotonation of the carboxyl groups. 42,43 As for the FT-IR spectra of PS, the peaks at 2800–3100 cm −1 are assigned to the C–H stretching and the peaks at 1496 cm −1 and 1452 cm −1 are attributed to the stretching vibration absorption of C C bond of the benzene rings. After the block copolymerization using Tb complex as the second monomer, a new characteristic peak emerged at 1380 cm −1 corresponds to the COO − stretching vibration of the PS- b -Tb complex, which indicated the successful synthesis of the PS- b -Tb complex.…”