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Park, Hyesong,Kim, Ka Young,Jung, Sung Ho,Choi, Yeonweon,Sato, Hisako,Jung, Jong Hwa American Chemical Society 2018 Chemistry of materials Vol.30 No.6
<P>We report a distinctly different dynamic helix inversion pathway of self-assembled terpyridine-based ligands composed of different numbers of peptide moieties with Co<SUP>2+</SUP> and its amplification of strain-induced chirality from an achiral terpyridine moiety. The helical chirality of the metal centers, coordinated by terpyridine ligands, is controlled by strain-induced chirality with complex ligand-to-Co<SUP>2+</SUP> ratios. We also show that the distinct helical inversion mechanism is significantly dependent on the number of peptides attached to ligands. The helical inversion pathway of the self-assembled ligand (<B>R-1</B> and <B>S-1</B>) complexes composed of one alanine analogue (<I>R</I>- or <I>S</I>-2-amino-1-propyl moiety) and one long saturated alkyl chain relies on two steps of chirality with different complex geometries, first from strain-induced chirality originating from an octahedral structure to octahedral structure with different helical direction and then on to helical chirality in a square-pyramidal structure. In contrast, the helix inversion of the self-assembled <B>R-2</B> and <B>S-2</B> complexes containing an alanine analogue and two glycine moieties with Co<SUP>2+</SUP> was followed by one step to form two distinct coexisting complex geometries having the same helical direction. In particular, the circular dichroism (CD) intensities of the self-assembled <B>R-1</B> and <B>R-2</B> complexes with Co<SUP>2+</SUP> were 900-1500-fold amplified compared to those of free <B>R-1</B> and <B>R-2</B>. The Gibbs free energies of the self-assembled complexes with different geometries were also calculated by temperature-dependent CD observation; the square-pyramidal structure of the self-assembled <B>R-1</B> complex with Co<SUP>2+</SUP> was more stable than the self-assembled <B>R-2</B> complex with Co<SUP>2+</SUP>. Furthermore, the self-assembled <B>R-1</B> and <B>S-1</B> complexes with 1.0 equiv of Co<SUP>2+</SUP> could classify amino acids by their chirality.</P> [FIG OMISSION]</BR>
Sumio Kaizaki,Dai Shirotani,Keiko Toya,Masako Iwamatsu,Yumiko Kato,Mikiko Maki,Takanori Hirami,Hiroshi Seki,Hiroyasu Nakata,Hisako Sato 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.5
This paper concerns with the synthesis and the luminescence spectra of lanthanide complexes of Eu(III) and/or Eu(II) orTb(III) ions which are embedded into fibrous palygorskite and sepiolite clays in which the magnesium ion are ion exchangedwith lanthanide ions. The He-Cd laser excitation photoluminescence of the present complexes without organic ligands exhibitthe deferration effects. The phosphors with light harvesting ligands such as benzophenone derivatives and 1,10-phenanthrolinegive the fairly strong visible luminescence by UV-A light excitation with a LED black light in a light room under fluorescentlamps. Further, the temperature dependent phosphors with benzophenone derivatives exhibit the stronger luminescence withincreasing the temperature over 100 oC.