title: Is it all in the hinge? A kryptoracemate and three of its alternative racemic polymorphs of an aminonitrile.
abstract: Four polymorphs of 2-(perfluorophenyl)-2-(phenylamino)acetonitrile have been crystallized and structurally analyzed: in addition to three racemic crystals, a rare kryptoracemate has been obtained. The central single bonds allow for conformational flexibility: the kryptoracemate as well as two of the remaining polymorphs contain several independent molecules with different conformation. In contrast to these uncommon packing modes, the fourth phase is unexceptional and crystallizes with a single molecule in the asymmetric unit. Individual crystallization batches may contain several crystal forms concomitantly.
authors.affiliation: Institute of Chemistry, Humboldt University Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany. beatrice.braun@hu-berlin.de.
authors.forename: R
authors.initials: R
authors.lastname: Laubenstein
authors.affiliation: Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu 1, 011061 Bucharest, Romania.
authors.forename: M-D
authors.initials: MD
authors.lastname: Şerb
authors.affiliation: Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
authors.forename: U
authors.initials: U
authors.lastname: Englert
authors.affiliation: Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Raabe
authors.affiliation: Institute of Chemistry, Humboldt University Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany. beatrice.braun@hu-berlin.de.
authors.forename: T
authors.initials: T
authors.lastname: Braun
authors.affiliation: Institute of Chemistry, Humboldt University Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany. beatrice.braun@hu-berlin.de.
authors.forename: B
authors.initials: B
authors.lastname: Braun