Dinuclear complexes of MnII, CoII and ZnII triply bridged by carboxylate groups: structures, properties and catalase-like function ‡
- 1 January 1997
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 23,p. 4595-4602
- https://doi.org/10.1039/a703842i
Abstract
1,3-Bis[(2-dimethylaminoethyl)iminomethyl]benzene (baib), having two isolated metal-binding sites separated by a m-xylenylene group, formed dinuclear metal(II) complexes [Mn2(baib)(O2CPh)3]BPh4·MeCN 1, [Mn2(baib)(O2CPh)3(NCS)] 2, [Co2(baib)(O2CMe)3]BPh4 3, [Co2(baib)(O2CPh)3]BPh4 4 and [Zn2(baib)(O2CMe)3]BPh4 5. The structure of a dimethylformamide adduct of 2, [Mn2(baib)(O2CPh)3(NCS)]·dmf 2′, was determined. It has a dinuclear core bridged by two benzoate groups in the symmetric η1:η1 mode and one benzoate group in the asymmetric η1:η2 mode, with a Mn · · · Mn separation of 3.501(4) Å. A thiocyanate ion co-ordinates to one Mn through its nitrogen; both manganese ions are six-co-ordinated. Complex 3 was also characterized crystallographically. The pair of cobalt ions are bridged by three acetate groups in the η1:η1 mode with a Co · · · Co intermetallic separation of 3.449(2) Å. The geometry about each Co is a trigonal bipyramid. The complexes 4·MeCN (4′) and 5 have dinuclear cores essentially similar to that of 3: Co · · · Co 3.482(2) and Zn · · · Zn 3.4648(7) Å. The physicochemical properties of the complexes are reported together with the catalase-like function of 1–3.Keywords
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