Temperature-Triggered Self-Assembled Structural Transformation: From Pure Hydrogen-Bonding Quadrilateral Nanonetwork to Trihexagonal Structures.

Adequate control over the structures of molecular building blocks plays an important role in the fabrication of desired supramolecular nanostructures at interfaces. In this study, the formation of a pure hydrogen-bonding co-assembly supramolecular nanonetwork on a highly oriented pyrolytic graphite surface was demonstrated by means of a scanning tunneling microscope. The thermal annealing process was conducted to monitor the temperature-triggered structural transformation of the self-assembled nanonetwork.

Synthesis and optimization of ZnPc-loaded biocompatible nanoparticles for efficient photodynamic therapy.

Zinc(ii) phthalocyanine (ZnPc) is a promising photosensitizer for PDT but suffers from aggregation in a physiological aqueous environment. In this paper, a class of biocompatible polymeric nanoparticles (NPs) was prepared to encapsulate ZnPc molecules. Mostly because of the planar structure, ZnPc molecules were difficult to be encapsulated into the polymeric NPs unless further coated with a thick poly-l-lysine (PLL) layer.

Highly efficient photodimerization of olefins in a nanotemplate on HOPG by scanning tunneling microscopy.

Efficient photochemical reactions on a surface are of great importance for their potential applications in optoelectronic devices. In this work, a highly efficient photodimerization reaction of an olefin cocrystal built from two trans-1,2-bis(4-pyridyl)ethylenes (4,4'-bpe) and two isophthalic acid molecules via N···H-O hydrogen bonds in between was achieved in a nanotemplate on a highly oriented pyrolytic graphite (HOPG) surface. 4,4'-Bpe molecules first undergo the trans-cis isomerization followed by [2+2] photodimerization in the nanotemplate on HOPG upon UV irradiation.

In situ STM investigation of two-dimensional chiral assemblies through Schiff-base condensation at a liquid/solid interface.

Nanoscaled two-dimensional (2D) chiral architectures are increasingly receiving scientific interest, because of their potential applications in many domains. In this paper, we present a new method for constructing 2D chiral architectures on surface. Based on in situ Schiff-base reaction of achiral dialdehyde with two types of achiral amines at the solid/liquid interface, two chiral species have been directly formed and confirmed by means of a scanning tunneling microscopy (STM) technique.

Ultrafast third-order nonlinear optical properties of ZnPc(OBu)(6)(NCS)/DMSO solution.

The ultrafast third-order nonlinear optical properties of ZnPc(OBu)(6)(NCS)/dimethyl sulfoxide solution are investigated by optical Kerr effect (OKE) and pump-probe techniques with femtosecond pulses. Using CS(2) as the reference, the third-order susceptibility of the sample solution is obtained as about 1.40x10(-14) esu at a concentration of 3.

[Spectral study of monoisothiocyanato-substituted 3:1 asymmetrical phthalocyanine zinc(II)].

Electronic absorption spectra of three monoisothiocyanato-substituted asymmetrical phthalocyanine zinc(II), 2-isothiocyanato-9,10,16,17,23,24-alkyloxyphthalocyanine zinc(II) [(RO)6 (NCS)PcZn(II)] (R = n-C4H9, n-C5H11, n-C10H21), were measured in five organic solvents. The effect and order of the substitute groups and solvents were studied by electronic absorption spectra. The changes of lamda(max) data are very small between monoamino- and monoisothiocyanato-substituted asymmetrical phthalocyanines.