Crystal structure of an intermolecular 2:1 complex between adenine and thymine. Evidence for both Hoogsteen and ‘quasi-Watson–Crick’ interactions |
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| Authors: | Sosale Chandrasekhar Tangali R Ravikumar Naik Susanta K Nayak Tayur N Guru Row |
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| Institution: | 1. Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India;2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India |
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| Abstract: | The titled complex, obtained by co-crystallization (EtOH/25 °C), is apparently the only known complex of the free bases. Its crystal structure, as determined by X-ray diffraction at both 90 K and 313 K, showed that one A–T pair involves a Hoogsteen interaction, and the other a Watson–Crick interaction but only with respect to the adenine unit. The absence of a clear-cut Watson–Crick base pair raises intriguing questions about the basis of the DNA double helix. |
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