Photophysical Properties of Functionalized Double Decker Phenylsilsesquioxane Macromonomers: [PhSiO<sub>1.5</sub>]<sub>8</sub>[OSiMe<sub>2</sub>]<sub>2</sub> and [PhSiO<sub>1.5</sub>]<sub>8</sub>[O<sub>0.5</sub>SiMe<sub>3</sub>]<sub>4</sub>. Cage-Centered Lowest Unoccupied Molecular Orbitals Form Even When Two Cage Edge Bridges Are Removed, Verified by Modeling and Ultrafast Magnetic Light Scattering Experiments
作者:Jun Guan、Kenji Tomobe、Ifeanyi Madu、Theodore Goodson、Krishnandu Makhal、Minh Tuan Trinh、Stephen C. Rand、Nuttapon Yodsin、Siriporn Jungsuttiwong、Richard M. Laine
DOI:10.1021/acs.macromol.9b00700
日期:2019.10.8
respectively, as in PhT8,10,12 cages. Heck cross-coupling with 4-Me/CNstyrene gives the corresponding 4-Me/CNstilbene-substituted cages. All compounds were characterized by FTIR, MALDI-TOF, TGA, NMR and GPC. These compounds show UV–vis absorptions very similar to individual stilbene analogues. However, emission for all macromonomers, except p-MeStil2Ph6DD(OTMS)4, is redshifted 50–70 nm as seen before in
Separation of asymmetrically capped double-decker silsesquioxanes mixtures
作者:David F. Vogelsang、Jonathan E. Dannatt、Robert E. Maleczka、Andre Lee
DOI:10.1016/j.poly.2018.08.016
日期:2018.11
A synthetic path to asymmetric side-capped double-decker shaped silsesquioxanes (DDSQ) and subsequent isolation is described. By strategically using a combination of dichloro and trichlorosilane capping agents, a resultant product with mixed silanol functionalities was obtained. The use of preparatory liquid chromatography (LC) cleanly separated DDSQ compound with asymmetric functionality, and HPLC provided a quantitative technique to analyze mixture ratios. These mixture ratios did not follow the expected statistical trend due to the steric effects on the rate of capping. As a consequence, a decreased amount of the desired asymmetric DDSQ was observed in some cases. This was overcome by varying the ratio of capping agents. Overall, this work demonstrates access to asymmetric DDSQ cages is feasible, and LC is an effective separation technique. (C) 2018 Elsevier Ltd. All rights reserved.
Synthesis of a “Butterfly Cage” Based on a Double‐Decker Silsesquioxane
Novel polyhedral structures were prepared with a butterfly-shape composed of oligosiloxane wings and a double-decker silsesquioxane (DDSQ) body. The compounds were synthesized in two steps from commercially available alkoxysilanes, and their structures were confirmed using spectroscopic methods and X-ray crystallography. Not like other phenyl-substituted cage silsesquioxanes, these butterfly cages
Supramolecular assemblies of dinuclear alkynylplatinum(<scp>ii</scp>) terpyridine complexes with double-decker silsesquioxane nano-cores: the role of isomerism in constructing nano-structures
Isomeric double-decker silsesquioxane-functionalized dinuclear alkynylplatinum(II) terpyridine complexes demonstrate self-association behaviours via the stabilisation of hydrophobic, Pt⋯Pt and/or π–π stacking interactions. These supramolecular architectures and molecular packings are found to be closely related to the isomeric configurations of the complexes and have been investigated using various spectroscopic