By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators publish new report on Biological Factors. According to news reporting originating in Jinan, People's Republic of China, by NewsRx journalists, research stated, "Crystalline nanostnictures with octahedral morphology have been prepared by self-assembling of cationic porphyrin (H6TPyP)(4+)center dot 4Cl(-) produced through chemical reaction route in aqueous solution depending on the synergistic interactions among hydrogen-bonding, it-it stacking, and ion pairing. Unexpectedly, the gradual decrease in pH by the slow evaporation of solvent in the nano-octahedron aqueous suspension obtained in situ led to the selective etching of the original nanocrystal and the isolation of (H6TPyP)(4+)center dot 4Cl(-) bulk single crystals in the last stage."
The news reporters obtained a quote from the research from the University of Jinan, "More interestingly, the increase in pH by adding water again into this bulk single-crystal-containing system led to the regeneration of nano-octahedrons, indicating the reversible transformation between porphyrin nano-octahedrons and bulk single crystals triggered by pH. Mechanistic investigations through powder and single-crystal X-ray diffraction analyses together with the electron microscopic, in particular, HRTEM, clearly reveal that the unique surface effect and anisotropic character of the nanomaterials differing from the bulk organic materials are responsible for such pH-sensitive reversible transformation of the two crystalline materials by controlling the dissolution or aggregation of (H6TPyP)(4+)center dot 4Cl(-), which actually induces the reversible formation and breaking of the (pyridine)N+-H center dot center dot center dot Cl-center dot center dot center dot H-O(H2O)center dot center dot center dot H-N+(pyridine) hydrogen bonds among cationic porphyrin building blocks at different pH."
According to the news reporters, the research concluded: "This result, to control the crystallinity and the unprecedented reversible transformation between nanocrystal and bulk single crystals just by tuning the pH of the synthesis process, as well as the use of the peculiar nanoeffect such as surface effect to adjust the self-assembling process, provides useful a tool for the controllable synthesis of crystalline materials and is expected to be helpful for further research and application of organic nanomaterials."
For more information on this research see: Porphyrin Nanocrystal Synthesized via Chemical Reaction Route: pH-Sensitive Reversible Transformation between Nanocrystals and Bulk Single Crystal. Journal of Physical Chemistry C, 2013;117(33):17352-17359. Journal of Physical Chemistry C can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Physical Chemistry C - www.pubs.acs.org/journal/jpccck)
Our news correspondents report that additional information may be obtained by contacting L. Wang, Univ Jinan, Dept. of Chem, Jinan 250022, People's Republic of China. Additional authors for this research include Y.L. Chen, Y.Z. Bian and J.Z. Jiang (see also Biological Factors).
Keywords for this news article include: Asia, Jinan, Porphyrins, Nanocrystal, Nanomaterial, Nanotechnology, Biological Factors, Biological Pigments, Emerging Technologies, People's Republic of China
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