A series of [RuX(dioxolene)(terpy)] (terpy = terpyridine; X = Cl, OAc) and one-electron oxidized complexes were prepared. The molecular structures of [RuCl(O2C6H2-3,5-Bu2)(terpy)] (1) and [Ru(OAc)(O2C6H4)(terpy)] (3) were determined by X-ray crystallography. Crystal data for 1: monoclinic, space group P21/c, Z = 8, a = 11.548(1), b = 18.224(5), c = 30.002(8) Å, β = 96.51(2)°, and R = 0.077 (Rw = 0.068). Crystal data for 3: monoclinic, space group C2/c, Z = 8, a = 13.355(5), b = 12.131(4), c = 26.645(4) Å, β = 92.46(2)°, and R = 0.041 (Rw = 0.041). Although the binding mode of O2C6H2-3,5-Bu2 to Ru was not determined by the molecular structure of 1, the carbon–oxygen and carbon–carbon bond lengths of O2C6H4 in 3 were consistent with those of catecholato ligands. Electronic absorption spectra of [RuX(dioxolene)(terpy)] were explained by the electronic structure of [RuIIX(semiquinone)(terpy)] rather than [RuIIIX(catecholato)(terpy)], while the reverse assignment was deduced from the IR spectra. Moreover, ESR spectra showed hyper-fine structures due to the contribution of semiquinone superimposed on an axial pattern of the Ru(III) center, indicating a resonance equilibrium between [RuIIX(semiquinone)(terpy)] and [RuX(dioxolene)(terpy)].
制备了一系列[RuX(二
氧戊环)(terpy)](terpy = 特
吡啶;X = Cl、OAc)和单电子氧化配合物。通过 X 射线晶体学确定了[RuCl(O2C6H2-3,5-Bu2)(terpy)](1)和[Ru(OAc)(O2C6H4)(terpy)](3)的分子结构。1 的晶体数据:单斜,空间群 P21/c,Z = 8,a = 11.548(1),b = 18.224(5),c = 30.002(8)埃,β = 96.51(2)°,R = 0.077 (Rw = 0.068)。3 的晶体数据:单斜,空间群 C2/c,Z = 8,a = 13.355(5),b = 12.131(4),c = 26.645(4)埃,β = 92.46(2)°,R = 0.041(Rw = 0.041)。虽然 O2C6H2-3,5-Bu2 与 Ru 的结合模式不能通过 1 的分子结构来确定,但 3 中 O2C6H4 的碳-氧键和碳-碳键长度与
儿茶酚配体一致。RuX(二氧
戊烯)(
铽)]的电子吸收光谱可以用[RuIIX(半醌)(
铽)]而不是[RuIIIX(
邻苯二酚)(
铽)]的电子结构来解释,而红外光谱则推导出相反的分配。此外,由于半醌的作用,ESR 光谱显示了叠加在 Ru(III)中心轴向模式上的超精细结构,表明[RuIIX(半醌)(
铽)]和[RuX(二氧杂
环戊烯)(
铽)]之间存在共振平衡。