A second monoclinic polymorph of 2-[2-(4-methoxyphenyl)hydrazinylidene]-1,3-diphenylpropane-1,3-dione C22H18N2O3
2011
Second Polymorph of a Chemical Compound
publication
Evidence: moderate
Author Information
Author(s): Carlos Bustos, Luis Alvarez-Thon, Daniella Barría, Juan-Guillermo Cárcamo, Maria Teresa Garland
Primary Institution: Instituto de Ciencias Químicas, Universidad Austral de Chile
Conclusion
The study presents the crystal structure of a second monoclinic polymorph of the compound C22H18N2O3, revealing significant structural differences from the first polymorph.
Supporting Evidence
- The new polymorph crystallizes in space group P21/c, while the first polymorph is in space group P21.
- The interplanar angle between the benzoyl units in the new polymorph is 80.04°.
- A strong resonance-assisted intramolecular hydrogen bond is observed in the molecular structure.
Takeaway
Scientists found a new version of a chemical compound that looks different from the first one they discovered, even though they are made of the same stuff.
Methodology
The compound was synthesized using a buffered solution and recrystallized from ethanol to obtain single crystals for X-ray studies.
Digital Object Identifier (DOI)
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