ChemInform Abstract: Alternate Layered Nanostructures of Metal Oxides by a Click Reaction.

Abstract

An alternating multilayer of titanium and tungsten oxides is synthesized by modifying layered titanium oxide with an alkene group and layered tungsten oxide with a thiol group, and causing a thiol—ene (click) reaction.

Construction of Highly Hierarchical Layered Structure Consisting of Titanate Nanosheets, Tungstate Nanosheets, Ru(bpy)32+, and Pt(terpy) for Vectorial Photoinduced Z-Scheme Electron Transfer

“…Alkene-immobilized tungstate nanosheets were prepared according to our reported procedure. 17,18,25 The XRD pattern of the alkene-immobilized layered tungstate (W 2 O 7 2− /C 6 -CC) is shown in Figure 2a. The peak at 2θ = 3.40°derived from the layered structure gives a d value (3.40 nm) attributed to the center-to-center distance of the neighboring layers.…”

“…In our previous report, the weight ratio of the titanate nanosheets and the tungstate nanosheets contained in the alternate-stacked structure was determined as 1:2 by means of inductively coupled plasma optical emission spectrometry (ICP-OES). 18 Therefore, the amount of Pt(terpy) contained in the Ti 0.91 O 2 0.36− /Pt(terpy)-Ru(bpy) 3 2+ -W 2 O 7 2− can be estimated as 0.032 mmol g −1 . It should be noted that Ti 0.91 O 2 0.36− /Pt(terpy)-Ru(bpy) 3 2+ -W 2 O 7 2− cannot be dissolved because Pt species were not dissolved in an aqueous solution of hydrofluoric acid.…”

“…Tungstate nanosheets exfoliated from alkene-immobilized layered tungstate (W 2 O 7 2− /C 6 -CC) were obtained using the reported procedure. 18,19,25,31 0.36− /C 6 -CC) was obtained using the reported procedure. 25 A mixture of the dispersion of Ti 0.91 O 2 0.36− /Pt(terpy)/ C 11 SH nanosheets and the dispersion of Ti 0.91 O 2 0.36− /C 6 -CC nanosheets was bubbled with nitrogen for 30 min, and then AIBN (5 mg) was introduced into the reaction mixture under nitrogen.…”

“…The alternate-stacked structure was made from thiol-functionalized titanate nanosheets and alkenefunctionalized tungstate nanosheets via a thiol-ene click reaction. 18,19 Moreover, this layered construction is ideal for the enlargement of the heterointerface where electrons are transferred. 20−24 As nearly all cationic molecules intercalated into the interlayer space by an ion-exchange process could make contact with the nanosheets, the electron transfer reactions between the stacked nanosheets and the intercalated molecules proceed efficiently.…”