Supramolecular Chiral Nanoarchitectonics

Exploration of molecular functions and material properties based on the control of chirality would be a scientifically elegant approach. Here, the fabrication and function of chiral-featured materials from both chiral and achiral components using a supramolecular nanoarchitectonics concept are discussed. The contents are classified in to three topics: i) chiral nanoarchitectonics of rather general molecular assemblies; ii) chiral nanoarchitectonics of metal-organic frameworks (MOFs); iii) chiral nanoarchitectonics in liquid crystals. MOF structures are based on nanoscopically well-defined coordinations, while mesoscopic orientations of liquid-crystalline phases are often flexibly altered. Discussion on the effects and features in these representative materials systems with totally different natures reveals the universal importance of supramolecular chiral nanoarchitectonics. Amplification of chiral molecular information from molecules to materials-level structures and the creation of chirality from achiral components upon temporal statistic fluctuations are universal, regardless of the nature of the assemblies. These features are thus surely advantageous characteristics for a wide range of applications.

Tuning Achiral to Chiral Supramolecular Helical Superstructures

The design and synthesis of achiral organic functional molecules which can assemble into a chiral with selective handedness in the absence of chiral substances is an important in understanding the role chirality plays within these systems. In this review, we described general approaches towards supramolecular chiral molecules the synthesis and self-assembly of achiral molecule to active chiral molecules to investigate controlled supramolecular chiral nanostructures with their photoluminescent properties for rapid, sensitive and selective detection of analytes of choice. Various small molecules have been discussed for achiral to chiral along with induction of chirality and controlled chiral helical structures in detail. We discussed few examples where stimuli used to control the chirality such as temperature, pH etc. Finally, we will also explore on the photo responsive helicity properties of the aggregation induced emission active molecule such as tetraphenylethene conjugates.

Air–water interfacial assembly of all-aromatic-substituted double-decker phthalocyanine forms aligned nanoparticles

In this manuscript, unexpected supramolecular assembly of [Formula: see text]-conjugated molecules containing complex aromatic substituents was investigated. The air–water interfacial assembly of double-decker phthalocyanines containing sixteen phenol substituents (Ce(Pc2)[Formula: see text] and Y(Pc2)[Formula: see text] form aligned nanoparticles. Depending on the different surface pressure, the Ce(Pc2)[Formula: see text] self-assembled nanostructures can be regulated thoroughly. Although Ce(Pc2)[Formula: see text] and Y(Pc2)[Formula: see text] have only aromatic substituent groups, no H- or J-aggregation of [Formula: see text]-conjugated systems can be detected from the UV-vis spectra of the assemblies of these double-decker phthalocyanines. When the nanostructures of these assemblies were changed greatly, no corresponding changes of UV-vis spectra and FT-IR spectra could be detected. These unusual results can be understood from the balance between the hydrophilicity of aromatic substituents and the ether linkages of double-decker phthalocyanines and the surface pressure, and open new. approaches for supramolecular assembly of complex [Formula: see text]-conjugated systems.

Vibrational spectra of alkylamino substituted phthalocyanine compounds: Density functional theory calculations

The infrared spectra of tetrakis(dibutylamino) phthalocyanine and octakis(dibutylamino) compounds were studied via theoretical investigations. The results reveal deep fusion of the peripheral alkylamino moieties with the phthalocyanine chromophore in the tetrakis(dibutylamino)- but not in the octakis(dibutylamino)-phthalocyanine compounds. The successive localized molecular orbitals (LMO) and bond order analyses give support for the infrared vibrational results.