Self molecular arrays

The incorporation a redox-active transition metal head group into a self-assembling molecule provides a ready means for the immobilization of transition-metal complexes onto an electrode surface [13,24]. Unlike other approaches to immobilization which generally yield rough, unordered arrays of molecules, self-assembly techniques can produce well-ordered, atomically smooth molecular arrays. 

PPy-coated ceramic nanomaterial (zeohte and titanium sihcate) has been fabricated with microscopic structural homogeneity [216]. The core-shell nanoparticle was synthesized via a self-assembled array of cetylpyridinium chloride on the surface of core material. Cetylpyridinium chloride played a critical role for sustaining the colloidal stability of resulting product and providing a nanoscopically confined environment for the growth of ordered PPy film. An ultrathin PPy layer (thickness 10-30 nm) was successfully deposited on the ceramic nanoparticle (diameter 100 nm). Even with a fairly low amount of PPy in the core-shell nanoparticle (8%), a high conductivity (5 S cm ) was obtained. The result was attributed to the enhanced molecular order of PPy chains compared with conventional PPy. 

It should be mentioned that the dimeric dichlorodistannoxanes (ClR2SnOSnR2Cl)2 (associated by dative bonding) are self-organized in the solid state into supra-molecular arrays by tin-chlorine secondary bonds (R = Me, Sn- -Cl 2.78 A R = Et, Sn- - -Cl 2.73 A) [201a]. 

Molecular strands possessing complementary (and self-complementary) arrays of hydrogen-bond donors (D) and... 

A thorough study of POP-scaffold based zipper assemblies was reported recently. However, it is rather difficult to compare obtained results because of the missing quantitative information such as Voc, he, 9. and EQE values. Nevertheless, the performed studies clearly demonstrated a great potential for the design of multichromophore self-assembled light harvesting molecular arrays. 

As with more traditional aspects of supramolecular chemistry, the approach to the formation of a self-assembled array can be as complex as one desires. Thus, the simplest approach in creating a surface-based self-assembled shucture is to use a single molecule capable of creating a supramolecular structure without the need to add an additional agent. An early example of the formation of a uni-molecular supramolecular structure mediated by hydrogen bonding was reported by Griessl et al The structure is... 

A second logical approach to controlling pore size in self-assembled arrays, apart from steric crowding of pores through molecular functionalization (see above) is through the use of molecules of different dimensions. What may be viewed as the parent compound to the PTCDI-melamine array is the array formed between cyanuric acid and melamine (Figure 10a). The interaction formed between cyanuric acid and melamine, and derivatives of the two compounds, represents one of the most extensively studied structural motifs in supramolecular chemistry." ... 

The simplest way to prepare a plasmonic nanostructure is thermal and electron beam deposition in vacuum on a flat substrate that is either hydrophilic or hydrophobic. Even though the roughness of the structure depends on the contact angle between the metal and substrate, which is less controllable, the method can be well applied to some metals. DUV plasmonic nanostructures were readily formed by thermal deposition of indium onto a glass substrate. The size of indium nanostructures can be controlled from 15 to 50 nm by the evaporation speed, pressure, and the deposited thickness. The resulting extinction peaks due to the dipole resonance were tuned to between 260 and 600 nm, which were used for surface enhancement of Raman spectroscopy by DUV excitation [7]. Self-assembled arrays of hemispherical gallium nanoparticles were deposited by molecular beam epitaxy on a sapphire support as a substrate for UV plasmonics. The mean NanoParticle radii of 23, 26, and 70 nm were fabricated at LSPR frequencies... 

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