A reaction of Fe(ClO4)2·6H2O or Fe(OTf)2(MeCN)2 with one equivalent of the tetradentate ligand bis(2-pyridyl)methyl-2-pyridylcarboxamide (Py2CHNHCOPy, tpcaH) furnished dimeric iron(II) complexes [Fe(tpcaH)]2X4 (X = ClO4 − (1a), OTf− (1b)). According to the X-ray diffraction data for the complex 1a, each iron atom is bound to the two pyridyl fragments of one ligand and the pyridylcarboxamide pair of the other one. Complex 1a is a dimer in the crystalline state, while in MeCN solution according to the mass spectrometric data with the electrospray ionization, 1H NMR spectroscopic data, and quantum chemical calculations, it is apparently in the equilibrium with monomers of different structures. Complex 1 catalyzes selective oxidation of saturated hydrocarbons with hydrogen peroxide presumably involving the perferryl intermediate, which has an N,N,O-facial coordination of potentially tetradentate ligand tpcaH structurally modeling the 2-histidine-1-carboxylate-facial triad of the nonheme oxygenases.
Fe(
ClO4)2-6H2O 或 Fe(OTf)2(MeCN)2与一个当量的四价
配体双(2-
吡啶基)甲基-2-
吡啶基甲酰胺(Py2CHNH
COPy,tpcaH)反应生成了二聚
铁(II)络合物[Fe(tpcaH)]2X4(X = - (1a),OTf- (1b))。根据络合物 1a 的 X 射线衍射数据,每个
铁原子都与一个
配体的两个
吡啶基片段和另一个
配体的
吡啶甲酰胺对结合。根据电喷雾离子化质谱数据、1H NMR 光谱数据和量子
化学计算结果,复合物 1a 在结晶状态下是二聚体,而在 MeCN 溶液中,它显然与不同结构的单体处于平衡状态。复合物 1 可催化饱和碳氢化合物与
过氧化氢的选择性氧化,这可能涉及到 perferryl 中间体,该中间体与潜在的四价
配体 tpcaH 具有 N、N、O 面配位,在结构上模拟了非血红素加氧酶的 2-组
氨酸-1-
羧酸盐面三元组。