Okuda, Shogo published the artcileSupramolecular Helical Assemblies of Dirhodium(II) Paddlewheels with 1,4-Diazabicyclo[2.2.2]octane: A Remarkable Substituent Effect on the Helical Sense Preference and Amplification of the Helical Handedness Excess of Metallo-Supramolecular Helical Polymers, Product Details of C12H25Br, the publication is Journal of the American Chemical Society (2022), 144(6), 2775-2792, database is CAplus and MEDLINE.
Authors report unique coordination-driven supramol. helical assemblies of a series of dirhodium(II) tetracarboxylate paddlewheels bearing chiral Ph or Me substituted amide-bound m-terphenyl residues with triethylene glycol monomethyl ether (TEG) or n-dodecyl tails through a 1:1 complexation with 1,4-diazabicyclo[2.2.2]octane (DABCO). The chiral dirhodiums with DABCO in CHCl3/n-hexane (1/1) form one-handed helical coordination polymers with a controlled propeller chirality at the m-terphenyl groups stabilized by intermol. hydrogen-bonding networks between the adjacent amide groups at the periphery mainly via a cooperative nucleation/elongation mechanism as supported by CD and vibrational CD along with variable-temperature (VT) absorption and CD anal. The VT visible-absorption titrations revealed the temperature-dependent changes in the degree of polymerizations The columnar supramol. helical structures were elucidated by x-ray diffraction and at. force microscopy. The helix-sense of the homopolymer carrying the bulky Ph and n-dodecyl substituents is opposite to those of other chiral homopolymers despite the same absolute configuration at the pendants. A remarkably strong “sergeants and soldiers” (S&S) effect was observed in most of the chiral/achiral copolymers, while the copolymers with the chiral bulky phenyl-substituted dirhodiums with n-dodecyl chains displayed an “abnormal” S&S effect accompanied by inversion of the helix-sense, which can be switched to a “normal” S&S effect by changing the solvent composition A nonracemic dirhodium complex of 20% enantiomeric excess bearing the less bulky chiral Me substituents with n-dodecyl chains assembled with DABCO to form an almost one-handed helix (the “majority rule” (MR) effect), whereas the three other nonracemic copolymers showed a weak MR effect.
Journal of the American Chemical Society published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, Product Details of C12H25Br.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary