192586-88-2Relevant articles and documents
Structurally diverse manganese(III) complexes of tetradentate N2O2 Schiff-base ligands with ancillary carboxylate donors
Hulme, Charlotte E.,Watkinson, Michael,Haynes, Michaela,Pritchard, Robin G.,McAuliffe, Charles A.,et al.
, p. 1805 - 1814 (2007/10/03)
A number of manganese(III) complexes of tetradentate N2O2 Schiff-base ligands have been prepared with various additional carboxylate anions.Five of these compounds have been crystallographically characterised revealing that a remarkable array of structural chemistry is available.A polymeric species is observed for n> 1, whereas a monomeric species is found in t)> 2 .The anti-anti bridging of the manganese centres in 1 is in contrast to that in 2n> 3 (H2bsaltn = 5-bromo-derivative of H2saltn), which exhibits rare syn-anti bridging; 3 also contains a dimeric repeat unit due to an alternate 180 degree twist in the polymeric chain necessitated by steric constraints.In contrast, the complexes containing the dianion of N,N'-bis(3-methoxysalicylidene)ethane-1,2-diamine (H2msalen) appear to be isostructural, 2>*EtOH 4 and n)>2> 5 being structurally characterised as essentially identical phenoxy-bridged dimers.An insoluble material of stoichiometry Mn4(O2CR)3(saltn)3(H2O)n (n = 0-3) was isolated from all reactions involving the saltn ligand; attempts to characterise these compounds by X-ray diffraction have been unsuccessful.However, the previously characterised manganese(IV) dimer 2>*2dmf 6 (dmf = dimethylformamide) and the monomeric species 7 were isolated in attempts to crystallise these materials.
