title: First-row transition metal complexes of ENENES ligands: the ability of the thioether donor to impact the coordination chemistry.
abstract: The reactions of two variants of ENENES ligands, E(CH2)2NH(CH)2SR, where E = 4-morpholinyl, R = Ph (), Bn () with MCl2 (M = Mn, Fe, Co, Ni and Cu) in coordinating solvents (MeCN, EtOH) affords isolable complexes, whose magnetic susceptibility measurements suggest paramagnetism and a high-spin formulation. X-Ray diffraction studies of available crystals show that the ligand coordinates to the metal in either a bidentate κ(2)[N,N'] or tridentate κ(3)[N,N',S] fashion, depending on the nature of ligand and/or identity of the metal atom. In the case of a less basic SPh moiety, a bidentate coordination mode was identified for harder metals (Mn, Fe), whereas a tridentate coordination mode was identified in the case of a more basic SBn moiety with softer metals (Ni, Cu). In the intermediate case of Co, ligands and coordinate via κ(2)[N,N'] and κ(3)[N,N',S] coordination modes, which can be conveniently predicted by DFT calculations. For the softest metal (Cu), ligand coordinates in a κ(3)[N,N',S] fashion.
authors.affiliation: Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. pdub@lanl.gov jgordon@lanl.gov.
authors.forename: Pavel A
authors.initials: PA
authors.lastname: Dub
authors.affiliation: Materials and Physics Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: Brian L
authors.initials: BL
authors.lastname: Scott
authors.affiliation: Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. pdub@lanl.gov jgordon@lanl.gov.
authors.forename: John C
authors.initials: JC
authors.lastname: Gordon