名称:
Design, synthesis, structure and magnetic behavior of a high spin binuclear Fe(III) complex of N-(1-ethanol)-N,N-bis(3-tert-butyl-5-methyl-2-hydroxybenxyl) amine
摘要:
The Mannich reaction of 2-aminoethanol, 2-tert-buty1-4-methylphenol, and formaldehyde at the ratio sets of 1:2:2 provided a new ligand, N-(1-ethanol)-N,N-bis(3-tert-butyl-5-methyl-2-hydroxybenxyl)amine (H3L). In the presence of base, H3L reacted with FeCl3 center dot 6H(2)O to form a dinuclear Fe(III) complex [FC2L2] 1. The value of mu at room temperature (5.95 mu(B)), is much less than the expected spin-only value (8.37 mu(B)) of two high spin (hs) Fe3+ (S = 5/2) ions [mu= g[Sigma ZS(S + 1)](1/2)], indicating there were strong interactions between Fe3+ ions. The effective magnetic moment (mu(eff)) decreased abruptly with cooling to a minimum value of 0.1 mu(B) at 2 K. It was worth noting that Fe3+ ions of 1 exhibited thermally induced quartet <-> doublet spin transitions, and these transitions were abrupt. The magnetic behaviors of 1 denoted the occurrence of intramolecular anti-ferromagnetic interactions. J (-13.58 cm(-1)) agrees with the result from Gorun-Lippard equation, -J (cm(-1))= Aexp(BP(angstrom)= 12.9). (C) 2010 Elsevier B.V. All rights reserved.