Absolute helicity of 1D chains influenced by enantiopure ligands |
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| Affiliation: | 1. Department of Surgery, Feinberg School of Medicine, Northwestern University, 676 North St. Clair Street, Suite 650, Chicago, 60611 Illinois;2. Division of Gastroenterology and Hepatology, Northwestern University Feinberg School of Medicine, Chicago, Illinois |
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| Abstract: | Two novel coordination polymers, Cd(D-1-Hcam)(nta)(H2O)2]2Cd(D-3-Hcam)(nta)(H2O)2]2·4H2O (1) and Cd(DL-Hcam)(nta)(H2O)2]·H2O (2) (D-1-Hcam/D-3-Hcam = monodehydrated d-camphoric acid, Hnta = nicotinic acid and DL-Hcam = monodehydrated dl-camphoric acid), have been synthesized under hydrothermal conditions. Complex 1 is a three-dimensional hydrogen bonding framework composed of two kinds of 1D helical chains which exhibit the same right-handed helix, whereas complex 2 is constructed with one kind of 1D racemic chains. Interestingly, both two chiral molecules in the structures play important roles in the absolute helicity although they are not in the backbones of the helix which are made of rigid achiral ligands. Furthermore, different coordination modes of chiral ligands regulated the fluorescent emission. |
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