Substituent effect on carbodithioate ligand field strength in iron(III) carbodithioates: Synthesis and characterization

New iron(III) carbodithioate complexes of the general formulae Fe(Lcdt)(3) [(where L is the anion of an heterocyclic amine and Lcdt are the following anions: 4-methylpiperazine-1-carbodithioate (4-MPipzcdt), 4-phenylpiperazin e-1-carbodithioate (4-PPipzcdt), piperidinecarbodithioate (Pipdcdt), 2-meth ylpiperidine-carbodithioate (2-MPipdcdt), 4-methylpiperidine carbodithioate (4-MPipdcdt), morpholinecarbodithioate (Morphcdt), 2,6-dimethylmorpholinec arbodithioate (2,6-M(2)Morphcdt), 2,5-dimethylpyrrolecarbodithioate (2,5-M( 2)Pyrrcdt)] and Fe-2[2-MPipz(cdt)(2)](3) [(2-MPipz(cdt)(2) = 2-methylpipera zine-1, 4-dicarbodithioate dianion)] have been synthesized. These compounds have been characterized by elemental analyses, infrared spectral and magne tic susceptibility measurements and in some cases by electron paramagnetic resonance studies. The room temperature magnetic moments of the complexes a re indicative of a trigonally distorted octahedral geometry around iron(III )observing a (6)A(1) reversible arrow T-2(2) spin croosover phenomenon. The EPR studies give the g(av) values 4.4960-4.9962.