作者:Waynie Olaprath、Kraig A. Wheeler、Mark E. McGuire
DOI:10.1007/s10870-011-0003-0
日期:2011.6
5,6-Dihydroxy-1,10-phenanthroline, obtained from recrystallization of a side-product of a condensation reaction between 1,10-phenanthroline-5,6-dione and 5,6-diamino-1,3-dimethyluracil, has been isolated as a dihydrochloride (C12H8N2O2·2HCl·0.5CH3CN) by vapor diffusion of acetonitrile into an ethanol/HCl solution. The compound crystallizes in the triclinic space group $$ P\overline1} $$ with a = 5.8334(1) Å, b = 9.8041(2) Å, c = 11.9895(2) Å, α = 81.511(1)°, β = 76.395(1)°, γ = 81.429(1)°, and V = 654.48(2) Å3, Z = 2, R[F 2 > 2σ(F 2)] = 0.028, and wR(F 2) = 0.078. The crystal packing is stabilized by two N–H+···Cl− interactions (2.18(3) Å, 2.13(2) Å) and two O–H···Cl− interactions (2.11(3) Å, 2.20(3) Å). Pi-stacking of the phenanthrolinium rings results in an interplanar distance of 3.431(5) Å with the phenanthrolinium ring centroids displaced from each other by ~6 Å. The results for this diprotonated species are compared to those reported by Lin et al. (Acta Cryst E65:o2367, 2009) for the monoprotonated form and this reveals the possibility of using the relative –OH/phenanthroline ring orientations as a qualitative diagnostic of metal–ligand interactions in metal complexes of this ligand (Larsson and Ohrstrom in Inorg Chim Acta 357:657, 2004; Guan et al. in Acta Cryst C64:m311, 2008). The crystal structure of the diprotonated form of 5,6-dihdroxy-1,10-phenanthroline (5,6-dihydroxy-1,10-phenanthrolinium-1,10-ium dichloride) is discussed and compared to both the monoprotonated form and those complexed with Mn(II) and Co(III) reported in the literature.
5,6- 二羟基-
1,10-菲罗啉是
1,10-菲罗啉-5,6-二酮和 5,6- 二
氨基-1,3-二甲基
脲嘧啶缩合反应的副产物,通过
乙腈蒸发扩散到
乙醇/HCl 溶液中分离出二盐酸盐 (
C12H8N2O2-2HCl-0.5CH3CN)。该化合物在三linic 空间群 $$ P\overline1} $$ 中结晶,a = 5.8334(1) 埃,b = 9.8041(2) 埃,c = 11.9895(2) 埃,α = 81.511(1)°,β = 76.395(1)°,γ = 81.429(1)°,V = 654.48(2) Å3,Z = 2,R[F 2 > 2σ(F 2)] = 0.028,wR(F 2) = 0.078。两种 N-H+-Cl- 相互作用(2.18(3) 埃、2.13(2) 埃)和两种 O-H-Cl- 相互作用(2.11(3) 埃、2.20(3) 埃)稳定了晶体堆积。
菲罗啉环的π-堆积导致平面间距为 3.431(5) 埃,
菲罗啉环的中心点彼此相距约 6 埃。该双质子化物种的结果与 Lin 等人(Acta Cryst E65:o2367, 2009)报告的
单质子化形式的结果进行了比较,从而揭示了使用 -OH/
菲罗啉环的相对取向作为该
配体的
金属配合物中
金属-
配体相互作用的定性诊断的可能性(Larsson 和 Ohrstrom,发表于 Inorg Chim Acta 357:657, 2004;Guan 等人,发表于 Acta Cryst C64:m311, 2008)。本文讨论了 5,6-二羟基-
1,10-菲罗啉的二质子化形式(5,6-二羟基-
1,10-菲罗啉鎓-1,10-二
氯化物)的晶体结构,并将其与文献中报道的
单质子化形式以及与
锰(II)和
钴(III)络合的形式进行了比较。