title: The crystal structures of two chalcones: (2E)-1-(5-chloro-thio-phen-2-yl)-3-(2-methyl-phen-yl)prop-2-en-1-one and (2E)-1-(anthracen-9-yl)-3-[4-(propan-2-yl)phen-yl]prop-2-en-1-one.
abstract: In the crystal of compound (I), C14H11ClOS, mol-ecules are linked by C-H⋯O hydrogen bonds to form simple C(5) chains. Compound (II), C26H22O, crystallizes with Z' = 2 in space group P-1; one of the mol-ecules is fully ordered but the other is disordered over two sets of atomic sites having occupancies 0.644 (3) and 0.356 (3). The two disordered components differ from one another in the orientation of the isopropyl substituents, and both differ from the ordered mol-ecules in the arrangement of the central propenone spacer unit, so that the crystal of (II) contains three distinct conformers. The ordered and disordered conformers each form a C(8) chain built from a single type of C-H⋯O hydrogen bond but those formed by the disordered conformers differ from that formed by the ordered form.
authors.affiliation: Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysuru 570 006, India.
authors.forename: Marisiddaiah
authors.initials: M
authors.lastname: Girisha
authors.affiliation: Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysuru 570 006, India.
authors.forename: Hemmige S
authors.initials: HS
authors.lastname: Yathirajan
authors.affiliation: Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435-2001, USA.
authors.forename: Jerry P
authors.initials: JP
authors.lastname: Jasinski
authors.affiliation: School of Chemistry, University of St Andrews, Fife KY16 9ST, UK.
authors.forename: Christopher
authors.initials: C
authors.lastname: Glidewell
keywords: chalcones; conformational disorder; crystal structure; hydrogen bonding; mol­ecular conformation; mol­ecular structure; supra­molecular assembly; synthesis