Syntheses, molecular structures, and spectroscopic properties of manganese(II)/(III) complexes with tetraphenylimidodiphosphinato and bi-pyridine or salicylaldehyde ligands

Publication date: Available online 25 November 2019Source: Inorganica Chimica ActaAuthor(s): Zhe Qian, Ying Zhang, Ai-Quan Jia, Hua-Tian Shi, Qian-Feng ZhangAbstractTreatment of [Mn(CH3COO)2∙4H2O] with two equivalents of K[N(Ph2PO)2] in the presence of one equivalent of 2,2′-bipyridine (bpy) or 5,5'-dimethyl-2,2'-bipyridine(dmbpy) in ethanol resulted in the formation of the mono-nuclear manganese(II) complexes [Mn{η1-O-N(Ph2PO)2}{N(Ph2PO)2}(EtOH)(bpy)] (1) and [Mn{N(Ph2PO)2}2(dmbpy)] (2), respectively. Interaction of [Mn(CH3COO)2∙4H2O], K[N(Ph2PO)2] and salicylaldehyde or 5-chlorosalicylaldehyde or 3,5-dibromosalicylaldehyde in the presence of triethylamine in methanol gave the bi-nuclear manganese(II) complexes [Mn2{N(Ph2PO)2}2(μ,η2-O,O′-Sal)2(MeOH)2] (3) and [Mn2{N(Ph2PO)2}2(μ,η2-O,O′-5-Cl-Sal)2(MeOH)2] (4), and a tetra-nuclear manganese(II)/(III) complex [Mn4{N(Ph2PO)2}2(μ,η2-O,O′-3,5-Br2-Sal′)2(MeOH)4(μ-OMe)2(μ3-OMe)2] (5), respectively. All complexes were characterized by infrared and ultraviolet spectroscopy, their molecular structures were unambiguously established by single crystal X-ray diffraction. The electrochemical properties of complexes 1-5 were also investigated in the paper.Graphical abstractReactions of [Mn(CH3COO)2·4H2O], K[N(Ph2PO)2] with bi-pyridines or salicylaldehydes led to the isolation of mono-, di-, and tetra-nuclear manganese(II)/(III) complexes under controlled reaction conditions.

Source: Inorganica Chimica Acta - November 26, 2019 Category: Chemistry Source Type: research