ISSN:
1572-901X
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Summary Isonitrosopropiophenonates of cobalt(III), cobalt(II), nickel(II) and palladium(II) have been synthesised and characterised. Isonitrosopropiophenonatonickel(II) exists as green and brown varieties, the green forming mono- as well as bispyridine adducts. The brown variety is obtained after removal of base from the adducts. I.r. data of the metal chelates suggest atrans-asymmetric structure involving N and O bonding for one form and atrans-symmetric structure involving either N or O bonding of the oximino-group for the other. The former is observed exclusively with isonitrosopropiophenonates of nickel(II) while the latter is common among the other metal chelates. The low magnetic moment of the mono-adduct is ascribed to super-exchange interaction between two metal ions through oxo-bridges in the dimer. Acis-octahedral structure has been assigned to the tris(isonitrosopropiophenonato) cobalt(III) on the basis of1H n.m.r. data. Isonitrosopropiophenone forms mixed-ligand complexes of cobalt(III) with tetradentate Schiff bases such as SALEN,N,N′-ethylenebis(salicylaldimine), and SALPN,N,N′-1,3-propylenebis-(salicylaldimine), where the isonitrose group bonds through the nitrogen atom. These complexes have a N,N,N,O,O,O ligand environment. The imino-nickel(II) and -palladium(II) complexes are assigned atrans-symmetric square planar structure. Characterisation of the complexes was based upon elemental analyses, conductivity and magnetic moment, and i.r.,1H n.m.r., and electronic spectra.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00618708
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