Synthesis and Crystal Structures of Two Dinuclear Iron(III) Complexes with Tripodal Ligands

Abstract

AbstractBy using the tripodal tetradentate ligands of tris(2‐pyridylmethyl)amine (TPA) or tris(2‐benzimidazolylmethyl)amine (NTB), two dinunclear iron(III) complexes [Fe2L2(μ2‐O)(μ2‐p‐NH2‐C6H4COO)]3+ (L=TPA, 1 and L=NTB, 2) were obtained. Both of the two complexes crystallize in monoclinic system with space group P2(1)/c. The cell parameters of 1: a=1.4529(4) nm, b=1.6622(5) nm, c=2.0625(6) nm, β=100.327(5)°, V=4.900(3) nm3, Z=4, F(000)=2344, Mr=1142.91, Dc=1.549 g/cm3, R1=0.0544, R2=0.0962. The cell parameters of 2: a=1.3378(4) nm, b=2.1174(7) nm, c=2.4351(7) nm, β=97.315(6)°, V=6.842(4) nm3, Z=4, F(000)=3116, Mr=1505.08, Dc=1.444 g/cm3, R1=0.0793, R2=0.1623. In both cases, the central iron(III) metal ions are coordinated to the four nitrogen atoms of TPA (or NTB) and two oxygen atoms from two different bridges to form a distorted octahedral geometry.