Covalent grafting of phenylphosphonate on calcium niobate platelets

Abstract

The results confirm the grafting of PPA on HCN and TBACN, quantify the extent of PPA grafting, and identify various grafting modes (mono-, bi-, and tridentate). All of these aspects are found to be dependent on the layered materials' exfoliation state, suspension processing conditions, and solvent composition. The results are rationalized in terms of a plausible mechanism of the grafting process.

Layered Titanate H2Nd2Ti3O10 Intercalated With n-Butylamine: A New Highly Efficient Hybrid Photocatalyst for Hydrogen Production From Aqueous Solutions of Alcohols

“…Perovskite-based hybrids are usually the result of either grafting reaction, where organic compounds are bonded to terminal interlayer oxygen atoms through strong ion-valence bonds Boykin and Smith, 2015;Shori et al, 2015), or intercalation, where organic amines form ammonium ions and interact with negatively charged perovskite layers (Tsunoda et al, 2003;Shimizu et al, 2006;Wang et al, 2007). Organic modification of layered oxide perovskites was first performed by intercalation of amines (Jacobson et al, 1987), and then expanded by covalent grafting of alcohols (Takahashi et al, 1995).…”

Layered Simple Hydroxides Functionalized by Fluorene‐Phosphonic Acids: Synthesis, Interface Theoretical Insights, and Magnetoelectric Effect

“…Funct. [70][71][72][79][80][81][82] In the present case, it is all the more complicated due to the large number of bands present in this region of the spectra. 2017, 27, 1703576 Infrared spectra of all hybrid compounds exhibit a band at 1600 cm −1 ascribed to the P(O)(OH) group [70] as well as a band around 1220 cm −1 corresponding to the PO band ( Figure S26, Supporting Information).…”

“…[75][76][77][78] In the case of phosphonic acids, the attribution of the IR bands is the subject of various contradictory assertions in the litterature. [70][71][72][79][80][81][82] In the present case, it is all the more complicated due to the large number of bands present in this region of the spectra. It is however possible to spot the fingerprint of each molecule in the corresponding hybrid compound with bands such as the ones present at 1604, 1469, 1446, and 1402 cm −1 that likely correspond to the CC rings stretching modes in the fluorene moieties.…”

Rapid Exfoliation and Surface Tailoring of Perovskite Nanosheets via Microwave‐Assisted Reactions

“…In HLaNb 2 O 7 for example, nanosheets are obtained via ultrasonic exfoliation of hosts containing fluoroalkoxy groups in the interlayer, or by growing a polymeric network in the interlayer, which then delaminates the layered structure into nanosheets within a polymer matrix . There is only one report where surface groups are covalently attached to nanosheets after exfoliation; this study involves the attachment of phenylphosphonate groups, where the entire process required over a week of reaction time (7 d exfoliation followed by 3 d of surface modification reaction) . In other cases, there is no actual covalent bond between the nanosheets and the surface groups or polymer chains; electrostatic interactions dominate these systems …”

“…[37][38][39] There is only one report where surface groups are covalently attached to nanosheets after exfoliation;t his study involves the attachment of phenylphosphonate groups,w here the entire process required over aw eek of reaction time (7 de xfoliation followed by 3d of surface modification reaction). [132,133] In other cases, there is no actual covalentb ond between the nanosheets and the surface groupso rp olymer chains;e lectrostatic interactions dominate theses ystems. [70,71,134,135] Rapid microwave-assisted (MA) methods have been found to be effective for organicm odification of bulk layered perovskites.…”