Bis(pyrazol-1-yl)acetates as Tripodal Heteroscorpionate Ligands in Iron Chemistry: Syntheses and Structures of Iron(II) and Iron(III) Complexes with bpza, bdmpza, and bdtbpza Ligands
- 1 October 2003
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 42 (22) , 7182-7188
Abstract
The molecular structure of the previously reported species “[Fe(bdtbpza)Cl]” has been revealed by X-ray structure determination to be a ferrous dimer [Fe(bdtbpza)Cl]2 (2c) [bdtbpza = bis(3,5-di-tert-butylpyrazol-1-yl)acetate]. The syntheses of ferrous 2:1 complexes [Fe(bpza)2] (3a) and [Fe(bdtbpza)2] (3c) as well as ferric 1:1 complexes [NEt4][Fe(bpza)Cl3] (4a) and [NEt4][Fe(bdmpza)Cl3] (4b) [bpza = bis(pyrazol-1-yl)acetate, bdmpza = bis(3,5-dimethylpyrazol-1-yl)acetate] are reported. Complexes 3a, previously reported [Fe(bdmpza)2] (3b), and 3c are high-spin. No spin crossover to the low-spin state was observed in the temperature range of 5−350 K. 4a and 4b are synthesized in one step and in high yield from [NEt4]2[Cl3FeOFeCl3]. 4a and 4b are iron(III) high-spin complexes. Crystallographic information: 2c (C24H39ClFeN4O2·CH2Cl2·CH3CN) is triclinic, P1̄, a = 12.171(16) Å, b = 12.851(14) Å, c = 13.390(13) Å, α = 98.61(9)°, β = 113.51(11)°, γ = 108.10(5)°, Z = 2; 3a (C8H7Fe0.5N4O2) is monoclinic, P21/n, a = 7.4784(19) Å, b = 7.604(3) Å, c = 16.196(4) Å, β = 95.397(9)°, Z = 4; 3c (C24H39Fe0.5N4O2) is monoclinic, P21/n, a = 9.939(6) Å, b = 18.161(10) Å, c = 13.722(8) Å, β = 97.67(7)°, Z = 4; 4b (C20H35Cl3FeN5O2) is monoclinic, C2/c, a = 30.45(6) Å, b = 12.33(2) Å, c = 16.17(3) Å, β = 118.47(5)°, Z = 8.Keywords
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