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Synthesis and Properties of a Trinuclear Copper(II) Complex with Trithiocyanurate Bridge

Kopel P., Čermáková S., Dolezal K., Kalińska B., Bieńko A., Mroziński J.

Polish Journal of Chemistry

2007

Vol. 81, nr 3

327-335

Mixed-ligand trinuclear Cu(II) complex involving trithiocyanurate(3-) anion (ttc3-) and N,N,N',N' , N'-pentamethyldiethylenetriamine (pmdien) in the coordination sphere of composition [Cu3(pmdien)3(mi-ttc)](ClO4)3 has been prepared. The complex has been characterized by EA, IR, UV-Vis, and mass spectroscopy. We can assume, that the complex is trinuclear with central atoms connected by trithiocyanurate(3-) bridges. Each central atom is in deformed trigonal bypiramidal arrangement formed by chelating S,N atoms of ttc(3-) and by three N atoms of pmdien. Temperature dependence of magnetic susceptibility and EPR spectroscopy have also been employed to characterize the compound. Magnetic susceptibility measurements over the 1.8-300 K temperature range revealed antiferromagnetic interactions among central atoms. The antitumor activity in vitro against G-361 (human malignant melanoma), HOS (human osteogenic sarcoma), K-562 (human chronic myelogenous leukaemia) and MCF-7 (human breast adenocarcinoma) tumor cell lines have been tested but unfortunately the complexes showed no cytotoxic activity against the four cell lines.

Complexes of iron(III) salen and saloph Schiff bases bridges by dicarboxylic acids

Kopel P., Sindelar Z., Biler M., Klicka R.

Polish Journal of Chemistry

1998

Vol. 72, nr 9

2060-2066

Six dinuclear Fe(III) complexes involving tetradentate Schiff bases N,N'-bis(salicylidene)ethylenediamine (salenH2) or bis(salicylidene)o-phenylenediamine (salophH2) with 2,6-pyridinedicarboxylic acid (2,6-dicarpyH2), thiodiglycolic acid (tdgaH2) or 3,3'-thiodipropionic acid (3,3'-tdpaH2) have been synthesized and characterized by elemental analysis, IR spectroscopy and conductivity measuremenys. The magnetic behavioral of all complexes has been studied between 77-298 K. The dicarboxylic acids form bridges between paramagmetic centers and weak antiferromagnetic intramolecular exchanges were found. Thus, the complexes can be characterized as high spin distorted octahedral iron(III), except for [{Fe(saloph)}2(2,6-dicarpy)], where S1 = S2 = 3/2 spin-exchange model complies best with experimental data and the iron(III) has probably aquare-pyramidal coordination mode. The HDW S1 = S2 = 5/2 spin-exchange model with (H = -2S1S2) was applied in the case of the other complexes. The antiferromagnetic coupling parameters J vary in the range of -1.06 to -5.87 cm(-1).