Crystal structure of 4-(4-hydroxyphenyl)-l(2H)-phthalazinone,C14H10N2O2

Crisp, G. T.; Jiang, Y.-L.; Tiekink, Edward R. T.

doi:10.1524/ncrs.1998.213.14.405

Cited by 2 publications

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“…This hydrogen bonding motif and primary building block has been previously observed for the acetyl capped chiral dipeptides N -acetyl- l -valinamide and N -acetyl- l -isoleucinamide. , All other structurally described acetyl capped dipeptides with no additional functionalities capable of hydrogen bonding (four chiral − and three racemic , structures have been reported) feature structures with variable primary packing motifs that all involve tightly hydrogen bonded two-dimensional (2-D) layers of molecules.…”

Section: Discussionsupporting

confidence: 63%

Mechanochemical Conversions Between Crystalline Polymorphs of a Complex Organic Solid

Altheimer

Pagola

Zeller

et al. 2013

Crystal Growth & Design

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We report the conversion between three crystalline polymorphs of a capped amino acid, N-acetyl-l-phenylalanyl-NH2, using mechanochemistry, with conversion between the α and γ polymorphs being reversible, depending on the milling conditions used. Solvent drop grinding of the α and β polymorphs with water yields the γ polymorph, whereas dry grinding of the β or γ polymorph yields the α polymorph. The α and β polymorphs are also accessible from solution (from methanol and water, respectively), and their structures were solved from single crystal diffraction data. The γ polymorph, so far only accessible mechanochemically, was solved and refined from powder X-ray diffraction data. The polymorphs show various degrees of crystallographic disorder, and the numbers of crystallographically independent molecules vary. These observations are supported by 13C and 15N magic angle spinning solid-state NMR data. Possible reasons for the formation of multiple polymorphs and their respective stability as a function of Z′, degree of disorder, and molecular shape and conformation are discussed. The results have implications for understanding the accessibility of new polymorphs of complex, low-symmetry organic solids with multiple dihedral degrees of freedom.

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Section: Discussionsupporting

confidence: 63%

Mechanochemical Conversions Between Crystalline Polymorphs of a Complex Organic Solid

Altheimer

Pagola

Zeller

et al. 2013

Crystal Growth & Design

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Hypervalent Compounds of Organic Germanium, Tin and Lead Derivatives

Baukov

Tandura

2009

Patai's Chemistry of Functional Groups

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Introduction and Outline Self‐Associates Pentacoordinate Anionic Compounds Pentacoordinate Intermolecular Neutral Compounds Pentacoordinate Intramolecular Neutral Germanium Compounds Pentacoordinate Intramolecular Neutral Tin and Lead Compounds Pentacoordinate Cationic Compounds Hexacoordinate Anionic Compounds Hexacoordinate Neutral Compounds Hexacoordinate Cationic Tin Compounds Acknowledgments

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Crystal structure of 4-(4-hydroxyphenyl)-l(2H)-phthalazinone,C14H10N2O2

Cited by 2 publications

References 0 publications

Mechanochemical Conversions Between Crystalline Polymorphs of a Complex Organic Solid

Mechanochemical Conversions Between Crystalline Polymorphs of a Complex Organic Solid

Hypervalent Compounds of Organic Germanium, Tin and Lead Derivatives

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