title: Comparisons of zinc with cadmium in N2S2 coordination and as S-bonded adducts to tungsten carbonyls.
abstract: The synthesis and characterization of bis-mercaptoethanediazaheptane cadmium(II) is reported and compared to the analogous zinc complex. Of significance is the dimeric form of the [Zn(N(2)S(2))](2) complex achieves penta-coordination about zinc through a bridging thiolate whereas cadmium engages two thiolate as S-bridges resulting in hexa-coordination about cadmium within a coordination polymer whose X-ray crystal structure is reported here. In the presence of W(CO)(5), this polymer breaks up, generating dimeric [Cd(N(2)S(2))](2) with two W(CO)(5) units appended to the terminal thiolates, a feat that is not observed for the zinc dimer analogue. The greater thiophilicity of cadmium over zinc is noted in several features of these complexes.
authors.affiliation: Texas A&M University, 3255 TAMU, College Station, TX 77843, USA.
authors.forename: Jason A
authors.initials: JA
authors.lastname: Denny
authors.forename: William S
authors.initials: WS
authors.lastname: Foley
authors.forename: Elky
authors.initials: E
authors.lastname: Almaraz
authors.forename: Joseph H
authors.initials: JH
authors.lastname: Reibenspies
authors.forename: Nattamai
authors.initials: N
authors.lastname: Bhuvanesh
authors.forename: Marcetta Y
authors.initials: MY
authors.lastname: Darensbourg
mesh_terms: D002104:Cadmium / Q000737:chemistry*; D019187:Cadmium Compounds / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry* / Q000302:isolation & purification; D007659:Ketones / Q000737:chemistry*; D008024:Ligands; D008968:Molecular Conformation; D014414:Tungsten / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D056831:Coordination Complexes; D007659:Ketones; D008024:Ligands; D002104:Cadmium; D015032:Zinc; D014414:Tungsten