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Di‐, Tetra‐, Penta‐ and Polynuclear Zinc Complexes Supported by a Flexible Tetradentate Schiff Base Ligand
Author(s) -
Wilson David J. D.,
Beavers Christine M.,
Richards Anne F.
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201101202
Subject(s) - chemistry , zinc , schiff base , ligand (biochemistry) , toluene , medicinal chemistry , tetra , yield (engineering) , polymer chemistry , inorganic chemistry , stereochemistry , organic chemistry , receptor , biochemistry , materials science , metallurgy
When treated with Et 2 Zn, the tetradentate Schiff base N , N′ ‐ethylenebis(4‐iminopentan‐2‐one) (H 2 L ) led to the formation of dimers, [ L 2 Zn 2 ], a tetranuclear complex, [ L 4 Zn 4 ] ( 1 ) and a polymeric material [ L Zn(Et)] n ( 2 ), thus highlighting the coordinative versatility of the ligand. Halogenation of 1 with SO 2 Cl 2 or Br 2 afforded in moderate yield the dinuclear zinc complexes [ L Zn(thf) · ZnCl 2 ] ( 3 ) and [ L Zn(thf) · ZnBr 2 ] ( 4 ). [ L Zn · ZnI(μ‐OEt)] 2 ( 5 ) was isolated from the reaction of an in situ generated mixture of 1 and 2 with iodine. This product likely results from adventitious oxygen in the reaction mixture. This was seemingly confirmed by the diffusion of air into a solution of 2 in toluene, thereby resulting in a pentanuclear zinc complex, [( L Zn · ZnEt) 2 {Zn(μ‐OEt) 4 }] ( 6 ). Complex 6 features a central Zn(OEt) 4 unit, in which the ethoxide groups bridge two dinuclear fragments. The identities of complexes 1 – 6 were conclusively identified by X‐ray crystallography, thereby revealing similar structural features that were confirmed by spectroscopic data and, for 1 – 5 , supported by DFT calculations.