混和溶剂的性质对Fe^2与trans-[CoCl_2(NH_3)_4]反应机理的影响

THE EFFECT OF MFDIA IN REDUTION BETWEEN TRANS—[CoCl_2(NH_3)_4]^+. AND IRON(Ⅱ), Ⅱ.

在H_2O—DMF(二甲基甲酰胺),H_2O—HMPA(六甲基磷酰三氨),H_2O—THF(四氢呋喃),H_2O—1.4Dioxane(1.4二氧六坏)和H_2O—DMSO(二甲亚矾)等混合溶剂中,trans—[CoCl_2(NH_3)_4]^+和Fe^(2+)还原反应,在15—35℃范围造行研究,实验表明:X_(DMSO)=0.3,X_(DMF)=0.25,X_(HMPA)=0.14,XD_(Di)=0.12时,反应速度有明显变化。在H_2O—DMSO混和溶剂中进行Fe与tfans—(CoCl_2(NH_)_4)^+反应时,已经显现出了溶剂会合体对被研究反应动力学性质的显着影响。本文的目的是:在可能形成溶剂会合体的更多混合溶剂中,进行上述同一被研究反应,在更大范围内探讨溶剂会合体,混合溶剂中非水溶剂组分和反应物离子的溶剂化作用等对被研究反应动力学性质的影响。被研究反应: Fe^++trans—[CoCl_2(NH_3)_4)^++4H^+—→Fe^(3+)+Co^(2+)+2Cl^-+4NH_4^+ 所选用溶剂: DMF—H_2O,HMPA—H_2O,THF—H_2O。

riange of 15—35℃,the kinetics of the reduction of the trans—[CoCl_2 (NH_3)_]^+ complex by iron(Ⅱ)has been studied in mixed solvents of water and N,N—Dimetyl formamide(DMF),Hexametyl phosphoric tri- amide(HMPA),Tatrahydrofuran(THF),1—L—Dioxane.within the.The studies show when X_(DMSO)≈0.30,X_(DMF)≈0.25,X_(HAPA)≈0.14,X_(Dioxane)≈0.12, the rate of the leaction changes notably.