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- W2000506890 abstract "Three polymeric iron(III) complexes [Fe(tdim)Ln]CIO4(L = L11, L2 or L33) consisting of a bridging ligand (tdim = 1,1′-tetramethylenediimidazole) and a quadridentate Schiff base ligand have been prepared and characterized, where H2Ln= RN(CH2)2NR′[R = R′= MeC(OH)CHCMe, n= 1; R = R′=o-HOC6H4CH=,n=3;R = MeC(OH)CHCMe, R′=o-HOC6H4CH=,n= 2]. Magnetic susceptibility data (4.2–300 K) showed that 1 is low spin (S= 1/2), 2 of spin equilibrium (S= 5/2⇌½), and 3 essentially high spin (S=5/2) and exhibiting an unusual behaviour below ca. 100 K. The spin equilibrium of 2 occurs over a wider temperature range than that of the corresponding mononuclear complex [Fe(mim)2L2]CIO4(mim = 1-methylimidazole). A crystal structure analysis of 3 confirmed that it has an infinite zigzag-chain structure and the iron(III) ion is six-co-ordinated by N2O2 donor atoms of the quadridentate ligand, an imidazole nitrogen atom of a bridging ligand and a nitrogen atom of the adjacent bridging ligand. The crystal structure also shows that 3 suffers from disorder and there are two configurations A and B with respect to the orientation of the imidazole moiety, having populations of 0.65 and 0.35, respectively. The unusual magnetic behaviour is rationalized by the crystal structure, Mössbauer and ESR spectra." @default.
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- W2000506890 title "Synthesis and magnetic properties of iron(<scp>III</scp>) complexes bridged by 1,1′-tetramethylenediimidazole exhibiting an infinite zigzag-chain structure" @default.
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- W2000506890 doi "https://doi.org/10.1039/dt9930003277" @default.
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