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Structures and Properties of Novel Mononuclear Iron(III) Complexes with Benzimidazole Containing Tripodal Tetradentate Ligands
Author(s) -
Pascaly Matthias,
Nazikkol Çetin,
Schweppe Florian,
Wiedemann Andreas,
Zurlinden Kristin,
Krebs Bernt
Publication year - 2000
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/(sici)1521-3749(200001)626:1<50::aid-zaac50>3.0.co;2-y
Subject(s) - chemistry , benzimidazole , amine gas treating , tris , catechol , tripod (photography) , medicinal chemistry , stereochemistry , tripodal ligand , organic chemistry , biochemistry , physics , optics
The iron(III) complexes of the tripodal benzimidazole‐containing ligands tris(2‐benzimidazolylmethyl)amine (ntb), bis(2‐benzimidazolylmethyl)(2‐hydroxyethyl)‐amine (bbimae) and tris(5,6‐dimethyl‐2‐benzimidazolylmethyl)amine (me 2 ntb) are structural and functional models for intradiol cleaving catechol dioxygenases. The complexes [Fe(ntb)Cl 2 ]Cl · 3 CH 3 OH ( 1 ; P 1, a = 9.830(2) Å, b = 12.542(3) Å, c = 13.139(3) Å, α = 82.88(3)°, β = 73.45(3)°, γ = 85.53(3)°, V = 1539.2(6) Å 3 ; Z = 2) and [Fe(bbimae)Cl 2 ]Cl ( 2 ; P2 1 /n , a = 7.461(2) Å, b = 18.994(5) Å, c = 14.515(4) Å, β = 98.22(2)°, V = 2035.8(9) Å 3 , Z = 4) have been characterized by X‐ray crystallography and spectroscopic methods. In the octahedrally coordinated complexes two cis coordination sites – essential for catechol binding – are occupied by chloride ligands. The significant intradiol cleaving catechol dioxygenase activity of the model complexes was examined using 3,5‐di‐ tert ‐butylcatechol as a substrate.