Crystal Engineering on Organic Pigments
Crystal Engineering on Organic Pigments
Crystal Engineering on Organic Pigments
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Described<br />
polymorphs<br />
�<br />
�<br />
B I<br />
�<br />
�'<br />
� I<br />
� II<br />
� ���<br />
� IV<br />
several �<br />
�<br />
�<br />
another �<br />
�<br />
Polymorphs of quinacrid<strong>on</strong>e:<br />
A real chaos<br />
Different X-ray powder diagrams<br />
But powder diagrams depend <strong>on</strong>:<br />
- <str<strong>on</strong>g>Crystal</str<strong>on</strong>g> size and morphology<br />
- <str<strong>on</strong>g>Crystal</str<strong>on</strong>g> quality<br />
- Preferred orientati<strong>on</strong><br />
(Old measurements in reflecti<strong>on</strong> mode)<br />
- Impurities or byproducts, which are<br />
incorporated into the crystal lattice<br />
=> distorti<strong>on</strong> of the lattice<br />
=> peak shifts<br />
- ...