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Studies from Technical University Describe New Findings in Hydrogen (Interplay of hydrogen bonding and molecule-substrate interaction in...

September 12, 2014



Studies from Technical University Describe New Findings in Hydrogen (Interplay of hydrogen bonding and molecule-substrate interaction in self-assembled adlayer structures of a hydroxyphenyl-substituted porphyrin)

By a News Reporter-Staff News Editor at Science Letter -- Data detailed on Hydrogen have been presented. According to news reporting originating from Chemnitz, Germany, by NewsRx correspondents, research stated, "The formation of hydrogen-bonded organic nano-structures and the role of the substrate lattice thereby were investigated by scanning tunneling microscopy. The self-organization of 5,10,15,20-tetra(p-hydroxyphenyl)porphyrin (H2THPP) molecules leads to two molecular arrangements on Au(111)."

Our news editors obtained a quote from the research from Technical University, "One of these is characterized by pair-wise hydrogen bonding between hydroxyl groups and a low packing density which enables a rotation of individual molecules in the structure. A different interaction with stronger chain-like hydrogen bonding and additional interactions of phenyl groups was observed for the second structure. The influence of the substrate on the epitaxial behavior is demonstrated by the adsorption of H2THPP on the highly anisotropic Ag(110) substrate. There, several balances between the occupation of favorable adsorption positions and the number of hydrogen bonds per molecule were found. The molecules form molecular chains on Ag(110) and also assemble into two-dimensional periodic arrangements of differently sized close-packed blocks similar to the second type of supra-molecular ordering found on Au(111). Dispersion corrected Density Functional Theory calculations were applied to understand the adsorption and complex epitaxy of these molecules."

According to the news editors, the research concluded: "It is shown that the azimuthal orientation of the saddle-shape deformed molecule plays an important role not only for the intermolecular but also for the molecule-substrate interaction."

For more information on this research see: Interplay of hydrogen bonding and molecule-substrate interaction in self-assembled adlayer structures of a hydroxyphenyl-substituted porphyrin. Surface Science, 2014;628():132-140. Surface Science can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Surface Science - www.elsevier.com/wps/product/cws_home/505676)

The news editors report that additional information may be obtained by contacting L. Smykalla, Technical Univ Chemnitz, Inst Chem, D-09107 Chemnitz, Germany. Additional authors for this research include P. Shukrynau, C. Mende, T. Ruffer, H. Lang and M. Hietschold (see also Hydrogen).

Keywords for this news article include: Chemnitz, Germany, Europe, Biological Pigments, Elements, Gases, Hydrogen, Inorganic Chemicals, Porphyrins

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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