title: Synthesis and Dimer Cleavage Reactions of the N(2)S Thiolate Bridged Dimer [(mmp-dach)(2)Ni(2)]Cl(2).
abstract: The facile synthesis of a monoderivatized N(2)S ligand based on the cyclic diamine diazacycloheptane provides a tridentate donor which coordinates nickel(II), yielding a dithiolate bridged nickel dimer with a hinge angle of 135.7 degrees and acute N-Ni-N bite angles of ca. 80 degrees. Dimer splitting occurs on reaction with iodoacetamide, producing an S-alkylated octahedral complex. Cyanide also cleaves the dimer, resulting in a cyanide-bound N(2)S square planar monomer with two nucleophilic sites, thiolate-S and cyanide-N. Molecular structures of the dimeric cation, [(mmp-dach)(2)Ni(2)]Cl(2), the iodoacetamide derivative, [(dtp-dach)Ni(MeCN)(2)]Cl(2), and an S-oxygenate, [(smp-dach)Ni(CN)], are reported.
authors.affiliation: Department of Chemistry, Texas A&M University, College Station, Texas 77842-3012.
authors.forename: Craig A.
authors.initials: CA
authors.lastname: Grapperhaus
authors.forename: John A.
authors.initials: JA
authors.lastname: Bellefeuille
authors.forename: Joseph H.
authors.initials: JH
authors.lastname: Reibenspies
authors.forename: Marcetta Y.
authors.initials: MY
authors.lastname: Darensbourg