Crystal structures of (2E)-1-(3-bromo­thio­phen-2-yl)-3-(2-meth­oxy­phen­yl)prop-2-en-1-one and (2E)-1-(3-bromo­thio­phen-2-yl)-3-(3,4-di­meth­oxy­phen­yl)prop-2-en-1-one

In the mol­ecules of the title compounds, (2E)-1-(3-bromo-thio­phen-2-yl)-3-(2-meth­oxy­phen­yl)prop-2-en-1-one, C(14)H(11)BrO(2)S, (I), which crystallizes in the space group P-1 with four independent mol­ecules in the asymmetric unit (Z′ = 8), and (2E)-1-(3-bromo­thio­phen-2-yl)-3-(3,4-di­meth­oxy­phen­yl)prop-2-en-1-one, C(15)H(13)BrO(3)S, (II), which crystallizes with Z′ = 8 in the space group I2/a, the non-H atoms are nearly coplanar. The mol­ecules of (I) pack with inversion symmetry stacked diagonally along the a-axis direction. Weak C—H⋯Br intra­molecular inter­actions in each of the four mol­ecules in the asymmetric unit are observed. In (II), weak C—H⋯O, bifurcated three-center inter­molecular inter­actions forming dimers along with weak C—H⋯π and π–π stacking inter­actions are observed, linking the mol­ecules into sheets along [001]. A weak C—H⋯Br intra­molecular inter­action is also present. There are no classical hydrogen bonds present in either structure.