A second orthorhombic polymorph of (Z)-3-(9-anthryl)-1-(2-thienyl)prop-2-en-1-oneThis paper is dedicated to His Majesty King Bhumibol Adulyadej of Thailand (King Rama IX) for his sustainable development of the country.

A second orthorhombic polymorph of (Z)-3-(9-anthryl)-1-(2-thienyl)prop-2-en-1-oneThis paper is dedicated to His Majesty King Bhumibol Adulyadej of Thailand (King Rama IX) for his sustainable development of the country.

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The title heteroaryl bismarck armb?nd chalcone, C21H14OS, is a second orthorhombic polymorph which crystallizes in the space group P212121.The structure was previously reported [Fun et al.(2009).Acta Cryst.E65, o2168-o2169] in the space group Pna21.

The bond distances and angles are similar in both structures.In contrast, the overall crystal packing is different from that in the first orthorhombic Pna21 polymorph in which molecules were stacked into columns along the b axis and the thiophene units of two adjacent columns were stacked in a head to tail fashion.In the present polymorph, molecules are found to dimerize through a weak S.S interaction [3.6513 (7) Å] and these dimers are arranged into sheets parallel to the cassis crista bc plane.

There are no classical hydrogen bonds in the packing which features short C.O [3.2832 (2)–3.6251 (9) Å], C.S [3.

4879 (17)–3.6251 (19) Å] and S.O [2.9948 (16) Å] contacts, together with C—H.π interactions.

Similar contacts were found in the other polymorph.