Redetermination of 5-iodo-uracil
1Chemistry Department, 'Sapienza' University of Rome, P. le A. Moro, 5, I-00185 Rome, Italy.
This study redetermined the crystal structure of 2,4-dihydroxy-5-iodopyrimidine, enhancing precision in geometric parameters. The molecule exhibits a distorted boat conformation, forming hydrogen-bonded ribbons in its crystal lattice.
Area of Science:
- Crystallography
- Structural Chemistry
- Organic Chemistry
Background:
- The crystal structure of 2,4-dihydroxy-5-iodopyrimidine was initially reported by Sternglanz, Freeman & Bugg in 1975.
- Previous structural data may lack the precision required for detailed analysis.
Purpose of the Study:
- To redetermine the crystal structure of 2,4-dihydroxy-5-iodopyrimidine with improved precision.
- To provide accurate geometric parameters for the title compound.
Main Methods:
- Single-crystal X-ray diffraction analysis.
- Crystal structure refinement.
Main Results:
- The crystal structure was redetermined, yielding significantly more precise geometric parameters.
- The asymmetric unit contains a non-planar molecule adopting a distorted B(25) boat conformation.
- Molecules associate into ribbons via N-H⋯O hydrogen bonds involving NH groups and carbonyl oxygen atoms.
Conclusions:
- The redetermination provides a high-precision structural model of 2,4-dihydroxy-5-iodopyrimidine.
- The observed molecular conformation and hydrogen bonding patterns offer insights into crystal packing forces.
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