Non-planar manganese Schiff-base complexes; synthesis and molecular structures
UNSPECIFIED. (2003) Non-planar manganese Schiff-base complexes; synthesis and molecular structures. POLYHEDRON, 22 (12). pp. 1617-1625. ISSN 0277-5387Full text not available from this repository.
Official URL: http://dx.doi.org/10.1016/S0277-5387(03)00285-7
The reactions of anhydrous sodium salts of three chiral biaryl-bridged salicylaldimine tetradentate proligands H2L with manganese(II) chloride give the corresponding solvated complexes [(MnL)-L-II]. The molecular structure of one chiral nonracemic example with a relatively low steric demand ligand set is shown to be composed of a homochiral dimer with bridging phenoxy groups. Both LMn units adopt the cis-beta structure with Delta helicity as predetermined by the (R)-configuration of the biaryls. Oxidation of these compounds with halogens gives manganese(III) complexes. A complex [(MnLI)-L-III] has a trigonal bipyramidal structure with similar cis-beta structure to that above. In contrast, the complex [MnL(OH2)(2)]Cl has the rather rare C-2-symmetric cis-alpha structure. It is thus apparent then that while the biaryl unit in these and similar compounds is able to predetermine the chirality-at-metal very efficiently, it is quite possible for conversions between diastereomeric forms cis-beta and cis-alpha, albeit with the same helicity, to occur in response to the nature of the co-ligands. (C) 2003 Elsevier Science Ltd. All rights reserved.
|Item Type:||Journal Article|
|Subjects:||Q Science > QD Chemistry|
|Journal or Publication Title:||POLYHEDRON|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|Date:||15 June 2003|
|Number of Pages:||9|
|Page Range:||pp. 1617-1625|
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