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)·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)).
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
Chihiro
C
Kachi-Terajima
Megumi
M
Ishii
Toshiaki
T
Saito
Chikahide
C
Kanadani
Takunori
T
Harada
Reiko
R
Kuroda
D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D060526:Magnetic Fields; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*
D009942:Organometallic Compounds; D003300:Copper