Monomeric and Dimeric Disulfide Complexes of Nickel(II)
作者:Vlad M. Iluc、Carl A. Laskowski、Carl K. Brozek、Nicole D. Harrold、Gregory L. Hillhouse
DOI:10.1021/ic101242c
日期:2010.8.2
Elemental sulfur reacts with a bulky bis(phosphine)nickel(0) complex to give a monomeric nickel(II) η2-disulfido complex, oxidation of which results in the elimination of sulfur with dimerization to give an η2,η2-disulfidodinickel(II) derivative in which the S−S bond can be reductively cleaved in a redox-reversible fashion.
Synthesis of (Pentamethylcyclopentadienyl)tantalum Sulfido Complexes via C−S Bond Cleavage of Triphenylmethanethiolate and Formation of a Novel Trithioborato Ligand
作者:Hiroyuki Kawaguchi、Kazuyuki Tatsumi
DOI:10.1021/om960864m
日期:1997.2.1
Treatment of Cp*TaCl4 with triphenyl-methanethiol via C-S bond cleavage gave rise to Cp*TaCl(S)(SCPh(3)) (1), which was treated with LiSR, Li2S, and NaBH4 to afford Cp*TaS(SR)(SCPh(3)) (R = CPh(3) (2), CMe(3) (3)), [Cp*Ta(S)(3)Li-2(THF)(2)](2) (4), and Cp*Ta-3(3)(S)(3)(S3BH) (5), respectively. The crystal structures of 1 and 5 were determined by X-ray diffraction.
Synthesis and characterization of three-coordinated Tin(II) chalcogenide compounds from chlorostannylene supported by β-diketiminato ligand
作者:Mingdong Zhong、Yi Ding、Da Jin、Xiaoli Ma、Yashuai Liu、Ben Yan、Ying Yang、Jiong Peng、Zhi Yang
DOI:10.1016/j.ica.2018.11.033
日期:2019.2
The stable chlorostannylene(II) LSnCl 1 reacted with bases or salts (KOH, t-BuOK, Ph3CSLi or Li2S), respectively, which led to the formation of a variety three-coordinated tin(II) chalcogens (O or S) (compounds 2-5). Compounds 2 and 5 are bridged bimetallic organotins(II) supported by a bidentate beta-diketiminato ligand. Furthermore, the catalytic activity of compounds 2-5 for hydroboration with benzaldehyde and acetophenone were investigated, respectively. In the X-ray analyses of all stannylene chalcogenide compounds, the pyr-amidalization on the tin center are useful to enhanced beta-character of lone pair. All compounds were characterized by H-1 NMR and C-13 NMR spectroscopy, single crystal X-ray structural analysis and elemental analysis.
S-nitrosothiol and nitric oxide reactivity at β-diketiminato zinc thiolates
作者:Matthew S. Varonka、Timothy H. Warren
DOI:10.1016/j.ica.2006.07.049
日期:2007.1
The beta-diketiminato zinc halide [Me2NN]ZnCl2Li(THF)(3) (1) is prepared in 51% isolated yield by addition of the lithium beta-diketiminate Li[Me2NN] to ZnCl2 in THF. Reaction of 1 with 2 equiv. of the thallium thiolate TISCy provides [Me2NN]Zn(mu-SCY)(2)TI}(2) (2), a TISCy adduct of [Me2NN]ZnSCy, as colorless crystals in 51% yield. Reaction of 1 with 1 equiv. TlSR provides the dinuclear [Me2NN]Zn(mu-SR)}(2) (R = Cy (3), Bu-t (4)) which possess unsymmetrically bridging thiolate ligands with pairs of dissimilar Zn-S distances in the solid state (2.350(3) and 2.417(3) angstrom for 3; 2.312(1) and 2.415(1) angstrom for 4). Reaction of 1 with LiSCPh3 results in the mononuclear zinc thiolates [Me2NN]ZnSCPh3(THF) (5) and [Me2NN]ZnSCPh3 (6) with shorter, but similar Zn-SR distances of 2.225(2) and 2.214(1) angstrom. Variable temperature H-1 NMR studies of 3 and 4 in CDCl3 Suggest that the aliphatic thiolates exist predominately as monomeric species in solution near room temperature, though at -50 degrees C two different beta-diketiminato species are observed for 3. Thiolate exchange among 3, 4, and 6 also takes place on the NMR timescale near room temperature. Both 4 and 6 undergo transnitrosylation with CySNO in CDCl3 to give [Me2NN]ZnSCy}(2) (3) and the corresponding S-nitrosothiol (BuSNO)-Bu-t or Ph3CSNO. Nitric oxide does not react with 4 or 6 under anaerobic conditions, but in the presence of O-2, NO cleaves the zinc-thiolate bond of 4 to rapidly give (BuSNO)-Bu-t. Similarly, anaerobic NO2 reacts with 4 to give (BuSNO)-Bu-t providing insight into the active nitrogen oxide species capable of cleaving Zn-SR bonds. (c) 2006 Elsevier B.V. All rights reserved.
PREUSS F.; NOICHL H., Z. NATURFORSCH., 42,(1987) N 2, 121-129