Secondary dialkylammonium salt/crown ether [2]pseudorotaxanes as nanostructured platforms for proton transport

Abstract

Multivalent secondary dialkylammonium salt/crown ether [2]pseudorotaxane, supramolecular polymer networks have been obtained by mixing surfactant-encapsulated clusters with dibenzo[24]crown-8 groups and star polymers end functionalized with dibenzylammonium ions. This induces remarkable enhancements and rational control of proton conductivity of the supramolecular networks.

Sub-10 nm Scale Lamellar Structures with a High Degree of Long-Range Order Fabricated by Orthogonal Self-Assembly of Crown Ether/Secondary Dialkylammonium Recognition and Metal···Metal/π–π Interactions

“…During these measurements, the molar ratio of the DB24C8 group against the DBA ion was held at 1:1. The resulting data revealed the formation of the supramolecular polymers with planar platinum­(II) complexes, Pt- n -PCL ( n = 1 , 2 , and 3 ), and their supramolecular oligomers and aggregates in solution. − Moreover, the size of the aggregates exhibited a clearly increasing order of Pt-1-PCL < Pt-2-PCL < Pt-3-PCL , due to the increasing ester number in Pt- n ( n = 1 , 2 , and 3 ), leading to the increasing supramolecular cross-linking with PCL-DBA .…”

“…Again, both σ ∥ and σ ⊥ values were in the order of Pt-1-PCL < Pt-2-PCL < Pt-3-PCL, coinciding with the increasing ester number in Pt-n, and thus, the increasing supramolecular cross-linking density of the DBA/ DB24C8 [2]pseudorotaxanes. 20 Of particular note, the σ ∥ values were roughly 2 orders of magnitude higher than the σ ⊥ values. This anisotropy of conductivities was reasonable because the in-plane conductivity was parallel to the lamellar channels confined with the proton conductor of DBA/ DB24C8 [2]pseudorotaxanes, while for the out-of-plane conductivity, the proton transport was blocked by the insulating PCL layers.…”

“…This was consistent with the melting point of PCL-DBA (311 K, Figure S22). Again, both σ ∥ and σ ⊥ values were in the order of Pt-1-PCL < Pt-2-PCL < Pt-3-PCL , coinciding with the increasing ester number in Pt- n , and thus, the increasing supramolecular cross-linking density of the DBA/DB24C8 [2]­pseudorotaxanes . Of particular note, the σ ∥ values were roughly 2 orders of magnitude higher than the σ ⊥ values.…”

Construction of Metallacage‐Cored Supramolecular Gel by Hierarchical Self‐Assembly of Metal Coordination and Pillar[5]arene‐Based Host−Guest Recognition

“…Pillar[ n ]arenes, as a new type of macrocyclic hosts after cyclodextrins, crown ethers, calixarenes, and cucurbiturils, have received increasing attention since they were first reported in 2008 . Their pillar‐shaped structures, ease of functionalization and extensive host−guest recognition capabilities especially for neutral guests make them widely applied in supramolecular polymers, drug delivery, sensors, etc .…”

Relation Between Charge Transport and the Number of Interconnected Lamellar Poly(3-Hexylthiophene) Crystals

“…Conductive atomic force microscopy (C-AFM) measurements were performed under nitrogen conditions using a scanning probe microscope (Dimension Icon, Bruker, USA) equipped with the PeakForce TUNA module. PF-TUNA has proven to be a useful tool for revealing nanoscale morphology and detecting the conductivity on the same location, establishing a direct correlation between morphology and conductivity. − In this work, PF-TUNA has been employed for measuring lateral charge transport, which was derived from the current flowing from the conductive tip, passing through P3HT edge-on lamellae and eventually into the substrate (see in Figure S3). , We used a conductive cantilever with a Pt/Ir-coated tip (model: PF-TUNA; spring constant: 0.4 N/m; tip radius: 25 nm).…”