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Published on: December 16, 2019
Polymorphism of 4-bromobenzophenone.
Mikhail A Strzhemechny1, Vyacheslav N Baumer, Anatoli A Avdeenko
1Verkin Institute for Low Temperature Physics and Engineering, 47 Lenin Avenue, Kharkov 61103, Ukraine. strzhemechny@ilt.kharkov.ua
Researchers studied two crystal forms of 4-bromobenzophenone using X-ray diffraction. A new polymorph was discovered, revealing insights into crystal structure and weak C-H...pi hydrogen bonds.
Area of Science:
- Solid-state chemistry
- Crystallography
- Materials science
Background:
- Polymorphism in organic compounds influences material properties.
- Understanding crystal structures is key to predicting material behavior.
- 4-bromobenzophenone is a compound with potential applications in materials science.
Purpose of the Study:
- To investigate the crystal structures of two polymorphs of 4-bromobenzophenone.
- To characterize the physical properties of each polymorph.
- To analyze the role of weak interactions in crystal stabilization.
Main Methods:
- Single-crystal and powder X-ray diffractometry.
- Variable-temperature studies (100–300 K).
- Crystal growth via solution and modified Bridgman-Stockbarger techniques.
Main Results:
- Two polymorphs of 4-bromobenzophenone were identified and structurally characterized.
- The stable polymorph is monoclinic (P2(1)/c), and the metastable form is triclinic (P\overline 1).
- Weak C-H...pi hydrogen bonds contribute to crystal stabilization, influencing thermal expansion.
Conclusions:
- A novel polymorph of 4-bromobenzophenone was synthesized and structurally elucidated.
- The study highlights the significant role of weak interactions in dictating crystal properties.
- The findings contribute to the understanding of polymorphism and its impact on material characteristics.
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