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Kenneth G. Caulton – One of the best experts on this subject based on the ideXlab platform.

  • Syntheses and structures of a series of very low coordinate barium compounds: Ba[N(SiMe3)2]2(THF)2, {Ba[N(SiMe3)2)]2(THF)}2, and {Ba[N(SiMe3)2]2}2
    Inorganic Chemistry, 1991
    Co-Authors: Brian A. Vaartstra, John C. Huffman, William E. Streib, Kenneth G. Caulton
    Abstract:

    Barium hexamethyldisilazide tetrahydrofuranate, Ba(N(SiMe{sub 3}){sub 2}){sub 2}(THF){sub 2} (1), is synthesized from barium granules and 1,1,1,3,3,3-hexamethyldisiliazane at 25{degree}C in THF. Gaseous ammonia is a necessary catalyst. In the solid state, the compound is a monomer containing a tetrahedral four-coordinate barium center. One of the coordinated THF molecules is removed from 1 by stripping a toluene solution of 1 to dryness in vacuo, yielding (Ba(N(SiMe{sub 3}){sub 2}){sub 2}(THF)){sub 2} (2). In the solid state, 2 is a dimer containing two bridging and two terminal hexamethyldisilamido groups. The four-coordinate, tetrahedral geometry at each barium is completed by terminal THF molecules. The solvent-free compound (Ba(N(SiMe{sub 3}){sub 2}){sub 2}){sub 2} (3) is obtained by sublimation of 1. This compound is a dimer in the solid state, with three-coordinate barium centers. Crystal data are reported for all these compounds 14 refs., 3 figs., 9 tabs.

Graeme Hogarth – One of the best experts on this subject based on the ideXlab platform.

  • Mercury(II) saccharinate (sac) complexes: Synthesis and molecular structures of [Hg(sac)2(2-ampy)2], [Hg(sac)2(2-ampy)(MeOH)], [Hg(sac)2(2-abt)(MeOH)], [Hg(sac)2(2-abt)(dmso)] (2-ampy = 2-aminopyridine, 2-abt = 2-aminobenzothiazole)
    Polyhedron, 2014
    Co-Authors: Subhi A. Al-jibori, Zana S. Afandi, Kurt Merzweiler, Christoph Wagner, Harry Schmidt, Sucharita Basak-modi, Graeme Hogarth
    Abstract:

    Abstract Reaction of [Hg(sac)2] with two equivalents of substituted pyridines, L, [L = 2-aminopyridine (2-ampy), 2-amino-3-methylpyridine (2-ammpy), 4-vinylpyridine (4-vipy), 4-ethylpyridine (4-etpy), 2-acetylaminothiazole (2-aamtz)] in MeOH affords [Hg(sac)2L2], a crystal structure of [Hg(sac)2(2-ampy)2] revealing a distorted tetrahedral HgN4 coordination geometry. When [Hg(sac)2] is refluxed with 2-ampy in MeOH a different product namely, [Hg(sac)2(2-ampy)(MeOH)], is formed selectively a crystal structure showing a distorted tetrahedral HgN3O coordination geometry. Reaction of [Hg(sac)2] with two equivalents of 2-aminobenzothiazole (2-abt) in various solvents did not lead to the disubstituted adduct, but rather solvent-stabilized complexes, [Hg(sac)2(2-abt)(S)] (S = EtOH, MeOH, or dmso) were isolated in high yields, the dmso adduct also being formed upon crystallization of [Hg(sac)2(2-abt)(EtOH)] from dmso. Crystal structures of [Hg(sac)2(2-abt)(MeOH)] and [Hg(sac)2(2-abt)(dmso)] show that the 2-aminobenzothiazole ligand is coordinated though the endocyclic nitrogen atom. Treatment of [Hg(sac)2] with two equivalents of 2-acetylaminothiazole (2-aamtz) yields [Hg(sac)2(aamtz)2] which, on the basis of spectroscopic data, is proposed to contain an octahedral mercury(II) center with both 2-aamtz ligands coordinating in a bidentate manner through the endocyclic N-atom of the thiazole ring and the oxygen atom of the acetyl group.

Brian A. Vaartstra – One of the best experts on this subject based on the ideXlab platform.

  • Syntheses and structures of a series of very low coordinate barium compounds: Ba[N(SiMe3)2]2(THF)2, {Ba[N(SiMe3)2)]2(THF)}2, and {Ba[N(SiMe3)2]2}2
    Inorganic Chemistry, 1991
    Co-Authors: Brian A. Vaartstra, John C. Huffman, William E. Streib, Kenneth G. Caulton
    Abstract:

    Barium hexamethyldisilazide tetrahydrofuranate, Ba(N(SiMe{sub 3}){sub 2}){sub 2}(THF){sub 2} (1), is synthesized from barium granules and 1,1,1,3,3,3-hexamethyldisiliazane at 25{degree}C in THF. Gaseous ammonia is a necessary catalyst. In the solid state, the compound is a monomer containing a tetrahedral four-coordinate barium center. One of the coordinated THF molecules is removed from 1 by stripping a toluene solution of 1 to dryness in vacuo, yielding (Ba(N(SiMe{sub 3}){sub 2}){sub 2}(THF)){sub 2} (2). In the solid state, 2 is a dimer containing two bridging and two terminal hexamethyldisilamido groups. The four-coordinate, tetrahedral geometry at each barium is completed by terminal THF molecules. The solvent-free compound (Ba(N(SiMe{sub 3}){sub 2}){sub 2}){sub 2} (3) is obtained by sublimation of 1. This compound is a dimer in the solid state, with three-coordinate barium centers. Crystal data are reported for all these compounds 14 refs., 3 figs., 9 tabs.