Homochiral 1D helical chain based on an achiral Cu(II) complex |
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Authors: | Kachi-Terajima Chihiro Ishii Megumi Saito Toshiaki Kanadani Chikahide Harada Takunori Kuroda Reiko |
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Institution: | Department of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan. chihiro.kachi@chem.sci.toho-u.ac.jp |
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Abstract: | Self-assembly of an achiral Cu(L)] complex produced a homochiral helical chain Cu(L)](3)·2H(2)O (1) (L = 2-dimethylaminoethyl(oxamato)). Interestingly, complex 1 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 P3(2). 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 (J = -74.4 cm(-1)). |
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