Fast Molecular Rotor Dynamics Modulated by Guest Inclusion in a Highly Organized Nanoporous Organosilica

Abstract

Rotor speed regulation in the hybrid walls of porous p‐phenylenesilica can be achieved by guest uptake and removal. A graduation from slow to ultrafast motional regimes (k=104–108 s−1) can be experienced by the molecular rotors depending on guest nature and temperature, as detected by solid‐state spin‐echo 2H NMR spectroscopy (see picture).

Graphene, electrons, plasmons, and quantum: a perfect match

“…The inelastic events recorded in electron energy-loss spectroscopy (EELS) and in light emission during electron-plasmon interaction (cathodolumisnescence, CL) have been recently used to resolve plasmon excitations and to yield maps with detailed spatial distributions [1]. Here, we will illustrate several recent examples of plasmon mapping via EELS and CL in both extended metallic nanostructures and in nanoparticles.…”

“…The tandem X-ray diffraction and solid state NMR approach allowed us to study amphipathic or amphidynamic materials i.e. crystalline structures that exhibit an intrinsic duality within the same periodic architecture [1][2][3][4]. In particular, we realized self-assembled crystalline architectures with guest molecules compartimentalized in two amphipathic nanospaces with distinct geometries and polarities [5].…”

“…The end blocks of the triblock copolymer were locked into the inclusion crystals whilst the central block was excluded, creating a new material of assembled nanocrystals regularly superimposed on one another. The formation of the supramolecular architectures was followed in situ synchrotron X-ray diffraction while fast-1 H MAS NMR provided direct evidence of selective inclusion of the blocks.Notably, amphidynamic materials could be recognized in hybrid organic-inorganic crystalline materials [1]. The precise engineering of highly-organized porous materials containing organic elements pivoted on inorganic layers enabled the fabrication of fast molecular rotors entirely exposed to the guest molecules exploring the cavities.…”

“…Notably, amphidynamic materials could be recognized in hybrid organic-inorganic crystalline materials [1]. The precise engineering of highly-organized porous materials containing organic elements pivoted on inorganic layers enabled the fabrication of fast molecular rotors entirely exposed to the guest molecules exploring the cavities.…”

Biodegradable Oxamide‐Phenylene‐Based Mesoporous Organosilica Nanoparticles with Unprecedented Drug Payloads for Delivery in Cells

“…UV-visible spectroscopy showed the expected absorption band of phenylenes at 270 nm ( Figure S6), which formed 7.2 nm domains of molecularly-aligned bridges according to wide angle x-ray diffraction (XRD, 7.6 Å peak) and the Scherrer's equation (Figure S7). 39,40 FTIR spectroscopy showed the phenylene aromatic C-H stretching (3100-3050 cm -1 ) and the Csp2-H modes (520 cm -1 , Figure S8). The high condensation degree of the siloxane network was supported by the shift of the Si-O mode from 1080 cm -1 in the precursor to 1090-1140 cm -1 in NPs.…”