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Exploring Polymorphism and Crystal Structures in Quinacridone and Diaryl Pigments

This article delves into the fascinating world of quinacridone pigments and their polymorphic forms, particularly focusing on Pigment Violet 19, Pigment Orange 36, and Pigment Red 53:2. We discuss the color properties, crystalline structures, and the implications of solid solution selection in crystal engineering. Utilizing advanced techniques such as lattice energy minimization and synchrotron data analysis, the study presents a comprehensive overview of the crystal structures of various pigments, addressing practical challenges in crystal determination.

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Exploring Polymorphism and Crystal Structures in Quinacridone and Diaryl Pigments

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    2. Quinacridone (Pigment Violet 19)

    3. Colour of quinacridone

    4. Crystal structures of b and g quinacridone

    5. Polymorphism and crystal engineering

    6. Selection of polymorphic form (and properties) using solid solutions

    7. Selection of polymorphic form (and properties) using solid solutions

    8. Selection of polymorphic form (and properties) using solid solutions

    9. Polymorphs of Pigment Orange 36

    10. Polymorphs of Pigment Orange 72

    15. Polymorphism of Pigment Red 53:2

    16. Polymorphism of Pigment Red 53:2

    17. Polymorphism of Pigment Red 53:2 Practical Problems

    18. Polymorphism of Pigment Red 53:2 Practical Problems

    19. Diaryl pigments

    20. Pigment Yellow 14: Structure solution by lattice energy minimization using CRYSCA

    21. Pigment Yellow 14: Molecular geometry

    22. CRYSCA: Prediction of possible crystal structures

    23. Pigment Yellow 14: Structure solution by lattice energy minimization using CRYSCA

    24. Pigment Yellow 14: Structure solution by lattice energy minimization using CRYSCA

    25. Pigment Yellow 14: Synchrotron data and Rietveld refinement

    26. Pigment Yellow 12 / 13 / 14: Crystal structures

    27. Polymorphism: A really hard case

    28. Methyl-dioxazine: Polymorphic forms

    29. Crystal structure determination from a non-indexable powder diagram

    30. Methyl-dioxazine: Structure solution

    31. Methyl-dioxazine: Crystal structure

    32. Some remarks on the method

    33. Coworkers (Hoechst / Clariant GmbH): Dr. H. Kalkhof, F. Becker, T. Simon, H.-J. Remsperger Coworkers (Frankfurt University): J. Djanhan, Dr. L. Fink, E. Alig, Dr. D.W.M. Hofmann, C. Buchsbaum X-ray powder diagrams: Prof. E. F. Paulus, U. Conrad (former Hoechst AG) Dr. M. Ermrich (X-ray lab, Reinheim) Synchrotron measurements: Prof. P.W. Stephens (NSLS Brookhaven) Rietveld refinements: Dr. R. E. Dinnebier (MPI Solid State Research, Stuttgart) Electron diffraction: Dr. U. Kolb, Univ. Mainz Financial support: Acknowledgements

    34. Acknowledgements

    35. Acknowledgements

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