Homochiral 1D Helical Chain Based on an Achiral Cu(II) Complex

Self-assembly of an achiral [Cu­(L)] complex produced a homochiral helical chain [Cu­(L)]₃·2H₂O (<b>1</b>) (L = 2-dimethylaminoethyl­(oxamato)). Interestingly, complex <b>1</b> obtained in our laboratory exhibits only a left-handed helical chain without any chiral source. Single-crystal X-ray analysis revealed the absolute structure and homochirality of its helical chain structure in the space group of <i>P</i>3₂. Solid-state circular dichroism (CD) spectra confirmed the high enantio excess of the crystals obtained in different synthesis batches. Magnetic susceptibility measurements reveal a relatively strong intrachain antiferromagnetic interaction between Cu­(II) centers via an oxamato bridge (<i>J</i> = −74.4 cm^–1)

Homochiral 1D Helical Chain Based on an Achiral Cu(II) Complex

Self-assembly of an achiral [Cu­(L)] complex produced a homochiral helical chain [Cu­(L)]₃·2H₂O (<b>1</b>) (L = 2-dimethylaminoethyl­(oxamato)). Interestingly, complex <b>1</b> obtained in our laboratory exhibits only a left-handed helical chain without any chiral source. Single-crystal X-ray analysis revealed the absolute structure and homochirality of its helical chain structure in the space group of <i>P</i>3₂. Solid-state circular dichroism (CD) spectra confirmed the high enantio excess of the crystals obtained in different synthesis batches. Magnetic susceptibility measurements reveal a relatively strong intrachain antiferromagnetic interaction between Cu­(II) centers via an oxamato bridge (<i>J</i> = −74.4 cm^–1)

Facile Synthetic Route to Highly Luminescent Sila[7]helicene

A facile synthetic route to dimethylsila[7]helicene by using a Lewis acid catalyzed double-cyclization reaction for construction of the twisted two phenanthrene moieties is described. Sila[7]helicene exhibited a high fluorescence quantum yield and a realatively large <i>g</i> value (dissymmetric factor) of circularly polarized luminencence (CPL) for small molecules

Facile Synthetic Route to Highly Luminescent Sila[7]helicene

A facile synthetic route to dimethylsila[7]helicene by using a Lewis acid catalyzed double-cyclization reaction for construction of the twisted two phenanthrene moieties is described. Sila[7]helicene exhibited a high fluorescence quantum yield and a realatively large <i>g</i> value (dissymmetric factor) of circularly polarized luminencence (CPL) for small molecules

Novel Means of Controlling the Solid-State Circular Dichroism Property in a Supramolecular Organic Fluorophore Comprising 4-[2-(Methylphenyl)ethynyl]benzoic Acid by Varying the Position of the Methyl Substituent

The solid-state circular dichroism (CD) of a 4-[2-(methylphenyl)­ethynyl]­benzoic acid/amine supramolecular organic fluorophore can be controlled by changing the position of the methyl substituent of the methylphenylethynyl unit on the achiral 4-[2-(methylphenyl)­ethynyl]­benzoic acid component molecule, instead of changing the chirality of the chiral amine component molecule