One-Dimensional Double Helical Structure and 4-Fold Type (2 + 2) Interpenetration of Diamondoid Networks with Helical Fashion
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We have prepared unique homochiral structures by the self-assembly of a modified amino acid derivative (terephthaloylmonoalanine, L-TMA) with metal ions such as Zn(II) and Cd(II). An L-TMA ligand and Zn(II) ions formed a left- handed, homochiral, double helical chain. However, while L-TMA and Cd(II) ions topologically formed a diamondoid Cd-L-TMA network with 4-fold type (2 + 2) interpenetration, Cd-L-TMA can be morphologically considered as a three-dimensional network of left-handed, double helices. The double helical structure of Zn-L-TMA originated from the self-assembly of individual helical chains by hydrogen bonds and π-π interactions, whereas the double helical structures of Cd-L-TMA were observed in an interpenetrating diamondoid net.