SYNTHESIS AND STRUCTURE OF IRON(III) AND CHROMIUM(III) COMPLEXES OF 2-DIETHOXYPHOSPHONYL-2-PHENYLETHEN-1-OL

Abstract

Iron(III) and chromium(III) complexes of 2-diethoxyphosphonyl-2-phenylethen-1-ol (2 and 3 respectively) have been synthesized and characterized by IR and electronic spectroscopic data. IR spectra have shown that 2 and 3 exist in (Z)-chelate and (E)-enolate forms. The crystal structure of 2 has been solved by X-ray methods. Crystal data: M = 821.54, monoclinic, P2₁/c, a = 19.249(5), b = 8.211(3), c = 25.313(5)Å, β = 98.10(2)°, V = 4106(4)Å, Z = 4, D _x = 1.328 g.cm⁻³, R = 0.081, R_w = 0.086 for 3012 reflections with I > 2σ(I). The structure consists of discrete ML₃ units in which the Fe cation is octahedrically coordinated by the three chelating ligands. The electronic spectrum of 3 indicated an octahedral structure as well.

Key Words:

• iron
• chromium
• 2-diethoxyphosphonyl-2-phenylethen-1-ol
• crystal structure