5-(Prop-2-yn-1-yl)-5H-dibenzo[b,f]azepine: orthorhombic polymorph

5-(Prop-2-yn-1-yl)-5H-dibenzo[b,f]azepine: orthorhombic polymorph

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In the title orthorhombic polymorph (space group Iba2), C17H13N, the dihedral angle between the benzene rings is 55.99 (10)° and the azepine ring adopts a boat conformation.In aluminum lotion the crystal, molecules are linked by C—H.π contacts.The previously-reported polymorph [Yousuf et al.

(2012).Acta Cryst.E68, o1101] crystallizes in the caruso milk thistle monoclinic system (space group P21/c) with two molecules in the asymmetric unit.