Confined Synthesis of a cis‐Isotactic Ladder Polysilsesquioxane by Using a π‐Stacking and H‐Bonding Superstructure

Abstract

On the rung way: Concerted self‐organization of an α,ω‐bis(triphenylenetetrahydroxy)disiloxane through π–π‐stacking and H‐bonding interactions generates a supramolecular channel in which silanol groups are entrapped between two hydrophobic columns. Ordered polycondensation leads to a high‐molecular‐weight, soluble, ladder cis‐isotactic polysilsesquioxane (see picture).

Preparation of soluble polysilsesquioxane containing phthalimido side-chain groups and its optical and thermal properties

“…1b). In addition, the 29 Si NMR spectrum of PSQ-PI in DMSO-d 6 exhibited intense signals in the T 3 region at À61.9 to À72.0 ppm, indicating Si atoms with three SieOeSi bonds (Fig. 4).…”

“…This PSQ is hereafter denoted as PSQ-PI (yield, ca. 90% based on the ideal chemical formula of one unit of this product [SiO 1.5 29 Si NMR (120 MHz, DMSO-d 6 ): d À54.9 to À60.9 (T 2 ), d À61.9 to À72.0 (T 3 ).…”

“…The resulting CD 3 OD/40%NaOD-D 2 O solution of the hydrolysis product was directly used for the 1 H NMR analysis. The 29 Si NMR spectra were recorded using a Bruker Avance III 600 spectrometer. The gel permeation chromatographic (GPC) analyses were performed using a HITACHI pump L-2130 and a HITACHI RI detector L-2490 under the following conditions: Shodex GPC KF-805L (bead size 10 mm and measurable molecular weight range 10 2 e4 Â 10 6 ) and KF-803L (bead size 6 mm and measurable molecular weight range 10 2 e7 Â 10 4 ) columns with chloroform as the eluent at a flow rate of 1.0 mL/min at 40 C using polystyrene standards.…”

“…29 Si NMR spectrum of PSQ-PI in DMSO-d6 . Chemical shifts were referenced to TMS (d 0.0) as an external standard.…”

Preparation and characterization of polysiloxane networks containing metallic platinum particles

“…2h 5 128 (d-spacing value ca. 7.4 Å ) can be ascribed to the distance between the chains in cross-linked products, [31][32][33] and its shape indicates the amorphous nature of 34 which confirms the presence of Pt 0 . Comparison of patterns of starting compounds with those after incorporation of platinum, leads to the statement that reflections ascribed to metallic Pt are present in diffractograms of all Pt-containing systems.…”