3 research outputs found
Formation of Coronene Clusters in Concentration and Temperature Controlled Two-Dimensional Porous Network
In
this research, with the assistance of scanning tunneling microscopy
(STM), we observed the two-dimensional (2D) self-assembly transition
of a star-shaped oligofluorene derivative (StOF) from disordered structure
to honeycomb network by adjusting StOF concentration in solution.
By introducing guest molecules coronene (COR), we for the first time
achieved novel triangle-shaped COR trimers on liquid/highly oriented
pyrolytic graphite (HOPG) interface in both honeycomb network and
the disordered structure. In thermal tests, the COR/StOF–disorder
system underwent a structural conformation to form well-ordered ladder
structures, while the COR/StOF–honeycomb system remained the
perfect hexagonal network with COR trimers included in the cavities.
Density functional theory (DFT) calculations have been employed to
investigate the forming mechanism of the molecular nanoarrays. These
studies are expected to enhance controlling on 2D self-assembly and
provide a facial approach toward constructing on-surface molecular
clusters
Analysis of anti-asthmatic drug patents published in China between 2004 and 2013
<p><b>Introduction</b>: We previously reported that 789 anti-allergic patents were granted in China between 1988 and 2008, but the number of patents seems to have grown much faster in China in recent years. Therefore, it is necessary to analyse the patents for anti-asthmatic products between 2004 and 2013 to give pharmaceutical companies and individuals a better understanding of potential candidates for anti-asthmatic drug development from patents published in China.</p> <p><b>Areas covered</b>: The current report analyses the scientific progress that supports anti-asthmatic drug patent applications and reviews the published patent literature in China from 2004 to 2013.</p> <p><b>Expert opinion</b>: The rapid increase in the number of anti-asthmatic patents in China indicates that more specific discoveries have been made and that more people are aware of the importance of intellectual property protection in China. Holding patents may guarantee protection for an innovative new product.</p
Self-Assembly and External Modulation of a Flexible Porphyrin Derivative on Highly Oriented Pyrolytic Graphite
With
the aid of scanning tunneling microscopy, we have examined
the two-dimensional hydrogen-bonded networks of carboxyl-functionalized
porphyrin derivative H<sub>2</sub>TCPp molecules at the heptanoic
acid/HOPG interface. Moreover, we have successfully modulated the
self-assembly structure of H<sub>2</sub>TCPp by introducing 1,2-diÂ(4-pyridyl)Âethylene
molecules into the assembled system. By performing density functional
theory calculations, we also revealed the formation mechanisms of
the different assemblies and the modulation process. Comparing the
self-assembly structures at the liquid/solid interface with those
in bulk crystals, we have obtained deep insight into the differences
in H<sub>2</sub>TCPp assemblies between 2D and 3D networks. Furthermore,
this research is expected to deepen our understanding of on-surface
phenomena and to provide a feasible process toward 2D assembly regulation