Cobalt(<scp>ii</scp>) and cobalt(<scp>iii</scp>) complexes of thioether-containing hexadentate pyrazine amide ligands: C–S bond cleavage and cyclometallation reaction
作者:Akhilesh Kumar Singh、Rabindranath Mukherjee
DOI:10.1039/b709901k
日期:——
(2a) (S = 0), resulting from a C-S bond cleavage reaction triggered by an acetate ion as a base, having CoN2(pyrazine)N'2(amide)S(thioether)S'(thiolate) coordination. On the other hand, the reaction of Co(O2CMe)2.4H2O with 1,4-bis[o-(pyrazine-2-carboxamidophenyl)]-1,5-dithiopentane (H2) (-CH2CH2CH2- spacer between the two pyrazine amide tridentate coordination units) in air affords a cobalt(II) complex
Co(O2CMe)2.4H2O与含硫醚的无环吡嗪酰胺六齿配体1,4-双[o-(吡嗪-2-羧酰胺基苯基)]-1,4-二硫代丁烷(H2L1)(-CH2CH2- (两个吡嗪酰胺三齿配位单元)提供具有CoN2(吡嗪)N'2(酰胺)S2(硫醚)配位的[CoII(L1)]。MeOH(1a)。它展示了一条八线EPR光谱,证明了CoII的低旋转(S = 1/2)状态。然而,在空气中的类似反应提供了[CoIII(L3a)(L3b)]。2MeOH(2a)(S = 0),这是由乙酸根离子作为碱触发的具有CoN2(吡嗪)的CS键裂解反应所致。 N'2(酰胺)S(硫醚)S'(硫醇盐)配位。另一方面,Co(O2CMe)2.4H2O与1,4-双[o-(吡嗪-2-羧酰胺基苯基)]-1的反应 空气中的5-二硫戊烷(H2)(两个吡嗪酰胺三齿配位单元之间的-CH2CH2CH2-间隔基)提供钴(II)配合物[CoII(L2)]。MeOH(1b