N,N-DIALKYL-N'-FERROCENOYLTHIOUREAS AND F ENE-1,1'-DICARBONIC-ACID-DI-N,N-DIALKYLTHIOUREIDES AS LIGANDS FOR TRANSITION-METALS - SYNTHESIS, ACID-DISSOCIATION CONSTANTS, X-RAY STRUCTURE DETERMINATION, AND EPR-SINGLE CRYSTAL INVESTIGATION

Reaction of ferrocenoylisothiocyanate or ferrocene-1,1'-dicarbonic aci d -diisothiocyanate with secondary amines gives N,N-dialkyl-N'-ferroce noylthioureas or the respective ferrocene-1,1'-dicarbonic acid-di-N,N- dialkyl-thioureides. The former yield neutral complexes with transitio n metal ions (Ni2+, Cu2+, Co2+, Pt2+, Fe3+). The acid dissociation con stants of the ligands were determined. The EPR spectra of a N,N-di(n)b utyl-N'-ferrocenoylthioureato)copper(II) single crystal are discussed. The X-ray structure determination of ferrocene-1,1'-dicarbonic acid-d i-N,N-diethyl-thioureide and its different behaviour against Ni2+ and Cu2+ is presented.