Syntheses and properties of group-4 complexes incorporating the tridentate, dianionic ligand NN-(dipyrrolyl-alpha-methyl)-N-methylamine, dpma, have been investigated. Addition of 1 equiv of H(2)dpma to Ti(NMe2)(4) and Zr(NMe2)(4) results in transamination with 2 dimethylamides providing Ti(NMe2)(2)(dpma) and Zr(NMe2)(2)(NHMe2)(dpma), respectively. Addition of 2 equiv of H(2)dpma to Zr(NMe2)(4) and Hf(NMe2)(4) results in production of the homoleptic complexes Zr(dpma)(2) and Hf(dpma)(2). Conversely, treatment of Ti(NMe2)(4) with 2 equiv of H(2)dpma does not provide Ti(dpma)(2), which was available by addition of 2 Li(2)dpma to TiCl4. The properties of the isostructural series M(dpma)(2) were investigated by single crystal X-ray diffraction, cyclic voltammetry, N-14 NMR, and other techniques. By N-14 NMR, it was found that the pyrrolyl resonance chemical shift changes approximately linearly with the electronegativity of the metal center, which was attributed to a-interaction between the pyrrolyl nitrogen lone pair and the metal. Other complexes produced during this study include Ti(CH2SiMe3)(NMe2)(dpma), TiCl2(THF)(dpma), and Ti(OCH2CF3)(2)(-)(THF)(dpma). Two isomers for Ti(CH2SiMe3)(NMe2)(dpma) were isolated and characterized.