Title
Transition metal complexes with neutral and deprotonated malonamide Transition metal complexes with neutral and deprotonated malonamide
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Weinheim ,
Subject
Chemistry
Source (journal)
Transition metal chemistry. - Weinheim
Volume/pages
19(1994) :4 , p. 468-476
ISSN
0340-4285
ISI
A1994PG67400023
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
New complexes of the general formulae [M(LH(2))(2)Cl-2] (M = Mn, Fe, Co, Ni, Cu, Zn), [Mn(LH(2))(2)X(2)] (X = Br, I), [Cu(LH(2))(2)Br-2], [Ni(LH(2))(2)X(2)] (X = Br, NCS, ONO2), [Cu(LH(2))X(2)](n) (X = Cl, Br), K-2[NiL(2)].2H(2)O and K-2[CuL(2)].H2O, where LH(2) = malonamide, were isolated. The complexes were characterized by elemental analyses, X-ray powder patterns, magnetic susceptibilities and spectroscopic (variable-temperature Fe-57-Mossbauer, e.s.r., u.v.-vis., i.r., far-i.r., Raman) studies. Monomeric trans pseudo-octahedral stereochemistries for the neutral 1:2 complexes and square planar structures of D-2h symmetry for the two ionic complexes are assigned in the solid state. Dimeric or polymeric five-coordinate structures are proposed for the 1:1 copper(II) compounds. LH(2) and L(2-) behave as bidentate chelating ligands binding through oxygen and deprotonated nitrogen atoms, respectively. A detailed comparison of the studied complexes with the corresponding oxamide complexes is also presented.
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