„IQPC Mai 2008 – 5th Annual Polymorphism – Polymorphism and Patenting “New Solid State Forms of Acetyl Salicylic Acid”
– Crystals Domains and Properties
– Synergistic analytical Strategies

IIWPCPS-8, assa international (advanced solid state analysis), Rhodes; 2006 “How Identical is Identity – Analytical data and Patenting” ….and the more legal side of the medal
Abstract: The aim of the present presentation is to give a brief introduction into special aspects of patenting polymorphs and their prosecution. To confer a solid state modification of a known substance novelty, it is necessary to make it distinguishable from known solid state modifications of this substance. Concerning inventive step aspects of the German and European approach will be presented. Some examples will be furnished, that show how critical the point of assortment of analytical methods and data are and how they can affect prosecution and challenging of the patent.

IQPC – Polymorphism and Patenting of Pharmaceutical Applications; 2005
“How identical is identity? X-ray patterns and patenting”
Abstract: X-ray powder patterns of solids are considered as unambiguous fingerprints of a crystalline solid to prove identity. 2θ-angles of the signals and their intensities contain different information, for which the significance is discussed in the context of polymorphs, pseudopolymorphs, isomorphic, and amorphous systems. The importance, complement character, and reliability of single crystal structure determination are bestowed. Examples from patent literature will be presented to demonstrate the relevance to disclose the experimental conditions and to avoid controversial and unclear situations.

• Fundamentals of XRD and the proposition in patenting
• Significance of powder patterns for proof of identity
• Racemic mixtures, enantiomers and mixtures of diastereomers Polymorphs, isomorphs, pseudopolymorphs and their X-ray diffraction
• Impact of experimental conditions on powder patterns and practical aspects

Supramolecular Synthesis by Cocrystallization of Oxalic and Fumaric Acid with Diazanaphthalenes. B. Olenik
Crystal Growth & Design, 2003, 3(2), 183-188.

6. Reproducible Phenazine Molecular Stacks.
Cryst. Eng. Comm., 2000, 17, 1-6.

Structure and Properties of Cocrystals of Phenazine and Fumaric, 2,3-Dihydroxyfumaric- and Oxalic Acid.
J. Prakt. Chem. 2000, 342(5), 465-472 (Full paper)

Role of weak hydrogen bonds in the crystal structures of phenazine, 5,10-dihydrophenazine and their 1 : 1 and 3 : 1 molecular complexes. 
New J. Chem., 2000, 24, 143-147

Role of weak hydrogen bonds in the crystal structures of phenazine, 5,10-dihydrophenazine and their 1 : 1 and 3 : 1 molecular complexes. 
New J. Chem., 2000, 24, 143-147

Design of a three Component Crystal based on the Cocrystal of Phenazine and 2,2´-Dihydroxy¬biphenyl. 
Struct. Chem. 1999,10(6), 429-431, Figure on frontpage

Light-Induced Cooperative Electron-Proton Transfer in Hydrogen-Bonded Networks of Diaryl Substituted 1,4-Bisimines and meso-1,2-Diaryl-1,2-ethanediols. 
J. Prakt. Chem. 1999, 341(7), 639-649 (Full paper)

Crystal Structure and Solid State Photochromism of Bis-N,N´-1,4-(4-X-phenyl)-1,4-diaza-1,3-butadienes.
(under examination)

Co-crystallization – The Supramolecular Synthesis
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