STUDIES ON THE CRYSTAL STRUCTURE OF CHALCONE DERIVATIVES Ⅰ. Crystal Structure of 4-Brom-4' -Methoxyl-Chalcone(BMC)

<正> BrC6H4C2H2COC6H4OCH3, Mr = 317. 19, is monoclinic, space group PC with unit cell of a = 15. 869(3), b = 7. 146(2), c=5. 991(1) (?); β=82.85 (1)°; Z = 2, Dc=1. 56g/cm3; V = 674. 1(?)3; λ(MoKa) = 0. 71073A, μ= 30. 1 cm-1, F(000) = 320e, final R = 0. 040, Rw = 0. 041 for 993 observed reflections with I>3σ(I). As the two phenyl planes and the C2H2CO group are non-coplanar, the conjugated system was disturbed. This will produce a large hypsochromic shift of cutoff wavelength of transmission.

STUDIES ON THE CRYSTAL STRUCTURE OF CHALCONE DERIVATIVES Ⅰ. Crystal Structure of 4-Brom-4' -Methoxyl-Chalcone(BMC)

BrC6H4C2H2COC6H4OCH3, Mr = 317. 19, is monoclinic, space group PC with unit cell of a = 15. 869(3), b = 7. 146(2), c=5. 991(1) (?); β=82.85 (1)°; Z = 2, Dc=1. 56g/cm3; V = 674. 1(?)3; λ(MoKa) = 0. 71073A, μ= 30. 1 cm-1, F(000) = 320e, final R = 0. 040, Rw = 0. 041 for 993 observed reflections with I>3σ(I). As the two phenyl planes and the C2H2CO group are non-coplanar, the conjugated system was disturbed. This will produce a large hypsochromic shift of cutoff wavelength of transmission.