The crystal structures of six (2E)-3-aryl-1-(5-halogeno-thio-phen-2-yl)prop-2-en-1-ones.

The structures of six chalcones containing 5-halogeno-thio-phen-2-yl substituents are reported: (2E)-1-(5-chloro-thio-phen-2-yl)-3-(4-ethyl-phen-yl)prop-2-en-1-one, C15H13ClOS, (I), and (2E)-1-(5-bromo-thio-phen-2-yl)-3-(4-ethyl-phen-yl)prop-2-en-1-one, C15H13BrOS, (II), are isostructural in space group P-1, while (2E)-1-(5-chloro-thio-phen-2-yl)-3-(4-eth-oxy-phen-yl)prop-2-en-1-one, C15H13ClO2S, (III), and (2E)-1-(5-bromo-thio-phen-2-yl)-3-(4-eth-oxy-phen-yl)prop-2-en-1-one C15H13BrO2S, (IV), are isostructural in space group P21/c. There are no hydrogen bonds of any kind in the structures of compounds (I) and (II), but in the structures of compounds (III) and (IV), the mol-ecules are linked into C(7) chains by means of C-H⋯O hydrogen bonds. In the structure of (2E)-3-(4-bromo-phen-yl)-1-(5-chloro-thio-phen-2-yl)prop-2-en-1-one, C13H8BrClOS, (V), there are again no hydrogen bonds nor π-π stacking inter-actions but in that of (2E)-1-(5-bromo-thio-phen-2-yl)-3-(3-meth-oxy-phen-yl)prop-2-en-1-one, C14H11BrO2S, (VI), the mol-ecules are linked into C(5) chains by C-H⋯O hydrogen bonds. In each of compounds (I)-(VI), the mol-ecular skeletons are close to planarity, and there are short halogen⋯halogen contacts in the structures of compounds (II) and (V) and a short Br⋯O contact in the structure of compound (VI). Comparisons are made with the structures of some similar compounds.