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Cover Picture: Isotopic Polymorphism in Pyridine (Angew. Chem. Int. Ed. 4/2009)
Author(s) -
Crawford Stephen,
Kirchner Michael T.,
Bläser Dieter,
Boese Roland,
David William I. F.,
Dawson Alice,
Gehrke Annette,
Ibberson Richard M.,
Marshall William G.,
Parsons Simon,
Yamamuro Osamu
Publication year - 2009
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200990000
Subject(s) - pyridine , cover (algebra) , polymorphism (computer science) , molecule , solid state , chemistry , crystallography , stereochemistry , medicinal chemistry , organic chemistry , mechanical engineering , biochemistry , genotype , engineering , gene
A low‐temperature polymorph is found to exist for [D 5 ]pyridine that does not exist for [H 5 ]pyridine. In their Communication on page 755 ff., R. Boese, S. Parsons, and co‐workers report the unusual complexity of the solid‐state structures of one of the simplest heteroaromatic molecules. Pyridine shows the unusual property of isotopic polymorphism, which is rare for organic or molecular compounds as isotopic substitution rarely has an effect on the stabilities of crystal structures.