Metal complexes with different numbers of iron atoms in a predominantly nitrogen-containing coordination environment have been synthesized on basis of benzothiazole mono- and bisformazans. The composition and structures of the resulting iron coordination compounds have been characterized by electronic absorption spectroscopy, elemental analysis, mass spectrometry, electron spin resonance, and magnetochemistry. The catalytic behavior of these metal chelates in the liquid-phase oxidation of sulfides and the oligomerization of ethylene has been studied.