A strategy to the ordered assembly of functional small cations with layered double hydroxides for luminescent ultra-thin films

Abstract

A cationic functional molecule (BNMA) was assembled with a positively-charged LDH monolayer through a polyanion (PVS) as the intermediary. The approach allows fine-tuning and ordered assembly of functional cations with LDH monolayers for designing and achieving novel organic-inorganic ultra-thin films.

Layered Double Hydroxide Materials: Assembly and Photofunctionality

“…28b). [95] Similar methods also appear for the neutral small molecules perylene [135] and tris [2-(4,6-difluorophenyl)pyridinato-C 2 ,N]iridium(III) (Ir(F 2 ppy) 3 ) [93]. With poly (N-vinyl carbazole) (PVK) as the carrier, (PVK@perylene/LDH) n and (Ir(F 2 ppy) 3 @PVK/LDH) n UTFs can be obtained based on hydrogen-bond LbL assembly.…”

“…Moreover, several small low-charged molecules or molecules with poor assembled force can also be co-assembled into interlayer of LDHs by employing ) show the plots of absorbance at 265 and 371 nm vs. n and optical photographs under 365 nm UV irradiation, respectively [95] polyanions. For example, Li et al [84] have achieved the co-assembly of the tris (8-hydroxyquinolate-5-sulfonate) aluminum (AQS 3À ) with three polyanions [polyanions poly(acrylic acid) (PAA), poly(styrene 4-sulfonate) (PSS), and poly [5-methoxy-2-(3-sulfopropoxy)-1,4-phenylene vinylene] (PPV)] to obtain the hybrid UTFs, denoted as (AQS@PAA/LDH) n , (AQS@PSS/LDH) n , and (AQS@PPV/ LDH) n (Scheme 2).…”

“…Yan et al [77] have introduced LDH nanosheet as building block to combine different chromophores; in this case, materials with a rigid and ordered microenvironment, finely tuning emission color, and polarized multicolor luminescence can be achieved. Figure 42 shows the assembly process of multicolor emission materials employing APPP (blue) [76], APPV (orange) [78], SPT (red) [79], and BNMA (green) [95] as primary chromophores. The combination of these individual chromophores can obtain organic/inorganic UTFs with emission color throughout the whole visible region, even the white color emission.…”

“…This largely restricts the development of LDH-based functional materials, and the assembly of LDH nanosheets with abundant functional cations remains a challenge. To meet this requirement, Yan et al [95] have proposed a new assembly strategy for cation-LDH UTFs by employing a suitable polyanion as the carrier. Bis(Nmethylacridinium) (BNMA, an important dye in the field of chemiluminescence) Fig.…”

ZnCr Layered Double Hydroxide (LDH) Nanosheets Assisted Formation of Hierarchical Flower‐Like CdZnS@LDH Microstructures with Improved Visible‐Light‐Driven H2 Production

“…[26] In addition, exfoliated ZnCr-LDH nanosheets have been used as building blocks to fabricate photocatalysts with layered metal oxide and polyoxometalate nanoclusters, which can enhance the production rate of oxygen significantly during the water splitting process. [27,28] Inspired by the inorganic template effect of LDHs nanosheets that can assemble into ordered nanocomposites, [29,30] herein, we have developed a facile one-pot hydrothermal process to obtain hierarchical flower-like CdZnS@LDH micro/nanostructures by the incorporation of ZnCr-LDH nanosheets (Figure S1 and S2 in Supporting Information (SI)) during the synthesis of CdZnS, as shown in Scheme 1. Firstly, the ZnCr-LDH nanosheets can serve as a layered template to regulate the precursor (thiourea) of CdZnS based on hydrogen-bond interactions, which facilitie the directional nucleation of CdZnS nanoparticles during the hydrothermal process.…”