PUB - Publikationen an der Universität Bielefeld

The syntheses and crystal structures of two new hexanuclear complexes are reported: [{(LCuII(ONO2))(LCuII(H2O))Nd-III}(2)-(mu-C2O4)](NO3)(2)center dot 6H(2)O (1) and [{(LNiII(H2O))N(CN)(2))}(2)Pr-III}(2)(ONO2)](OH)center dot 2H(2)O center dot 3CH(3)CN (2) (L is the dianion of the Schiff-base resulted from the 2:1 condensation of 3-methoxysalyciladehyde with 1,3-propanediamine). Compounds I and 2 were obtained by connecting heterotrinuclear cationic complexes [{LMII}(2)Ln(III)](3+) with oxalato or nitrato linkers. The structure of the complex cation in 1 shows two almost linear trinuclear [Cu2Nd] moieties which are linked by a bis-chelating oxalato bridge between the neodymium ions. The hexanuclear cationic moiety in 2 is built up of two heterotrinuclear [Ni2Pr] units that are linked by a nitrato group bridging two praseodymium(III) ions. The spectroscopic (FTIR, UV-Vis) and magnetic properties of 1 and 2 have been investigated. (c) 2007 Elsevier B.V. All rights reserved.