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Tripodal Ligands: Design of Distorted Coordination Polyhedra in Biomimetic Metal Complexes. Crystal structures of [Zn(SCN)(ntb)](SCN) · i PrpOH and [Fe(acac)(ntb)](ClO 4 ) 2 · 2CH 2 Cl 2 · i PrpOH, ntb = N‐tris(2‐benzimidazolylmethyl)amine
Author(s) -
Nazikkol Çetin,
Wegner Rainer,
Bremer Johannes,
Krebs Bernt
Publication year - 1996
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/zaac.19966220221
Subject(s) - chemistry , triclinic crystal system , crystallography , ligand (biochemistry) , trigonal bipyramidal molecular geometry , octahedron , tripodal ligand , dithiocarbamate , amine gas treating , denticity , bond length , crystal structure , coordination sphere , pentagonal bipyramidal molecular geometry , zinc , metal , stereochemistry , biochemistry , receptor , organic chemistry
The tripodal ligand N‐tris(2‐benzimidazolylmethyl)‐amine (ntb) was used for the preparation of zinc(II) and iron(III) complexes, [Zn(SCN)(ntb)](SCN) · i PrpOH ( 1 ) and [Fe(acac)(ntb)](ClO 4 ) 2 · 2CH 2 Cl 2 · i PrpOH ( 2 ). 1 has a highly distorted trigonal‐bipyramidal ZnN 5 coordination geometry. The donor atoms are nitrogens of one amine, three benzimidazoles and one SCN − . A striking feature of the complex is the length of the ZnN amine bond of 2.539(6)Å. The octahedral N 4 O 2 coordination sphere of the iron in 2 is less distorted than that of the zinc in 1 . The metal is surrounded by an amine and three benzimidazole nitrogens of the ligand and two oxygens of the bidentate acetylacetonate co‐ligand. The FeO bond lengths differ by about 0.1 Å. As for the unusual long ZnN bond in 1 this is a result of a trans effect. 1 crystallizes in the space group P 1 with: a = 9.530(1)Å, b = 13.402(1)Å, c = 13.578(2)Å, α = 98.83(1), β = 95.19(1), γ = 101.21(1)°, Z = 2; 2 is also triclinic, space group P 1 , with: a = 9.875(6)Å, b = 12.929(10)Å, c = 18.635(15)Å, α = 94.95(8)°, β = 101.01(6)°, γ = 111.09(4)°, Z = 2.