《Helix-Sense-Selective Synthesis of Right- and Left-Handed Helical Luminescent Poly(diphenylacetylene)s with Memory of the Macromolecular Helicity and Their Helical Structures》 was written by Maeda, Katsuhiro; Nozaki, Mai; Hashimoto, Kengo; Shimomura, Kouhei; Hirose, Daisuke; Nishimura, Tatsuya; Watanabe, Go; Yashima, Eiji. Category: alcohols-buliding-blocks And the article was included in Journal of the American Chemical Society in 2020. The article conveys some information:
Sym. substituted poly(diphenylacetylene) (PDPA) bearing carboxy pendants was found to fold into a one-handed helix upon thermal annealing with nonracemic amines in water accompanied by chiral amplification of the helicity. The induced right- or left-handed helical PDPA was retained (memorized) after complete removal of the chiral amines, thus producing a one-handed helical circularly polarized luminescent PDPA in a helix-sense-selective manner. The helical PDPA with static helicity memory is tolerant toward modification of carboxy pendants, providing functional PDPAs with an optical activity solely due to macromol. helicity. The PDPA and its derivatives before and after the one-handed helicity induction and its subsequent memory of the helicity, exhibited well-resolved very simple 1H and 13C NMR and Raman spectra, whose spectral patterns are virtually identical independent of the helical sense bias. Based on the 1H and 13C NMR, IR, Raman, and vibrational and electronic CD spectral measurement results, combined with theor. calculations, the key structural features (cis or trans and cisoid or transoid) of the PDPA, as well as its helix inversion barrier and absolute handedness (right- or left-handed helix) and helix-sense excess of the one-handed helical PDPA and its derivatives with static helicity memory, were determined As a result, almost complete right- and left-handed helical cis-transoidal PDPAs with 98% helix-sense excess were successfully obtained using noncovalent helicity induction and memory strategy. The experimental part of the paper was very detailed, including the reaction process of (1S,2R)-1-Amino-2,3-dihydro-1H-inden-2-ol(cas: 126456-43-7Category: alcohols-buliding-blocks)
(1S,2R)-1-Amino-2,3-dihydro-1H-inden-2-ol(cas: 126456-43-7) belongs to anime. Amines have a free lone pair with which they can coordinate to metal centers. Amine–metal bonds are weaker because amines are incapable of backbonding, but they are still important for sensing applications.While stronger than hydrogen bonds, amine–metal bonds are still weaker than both covalent and ionic bonds.Category: alcohols-buliding-blocks
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts