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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1422-1426 
    ISSN: 0044-2313
    Keywords: Trinuclear molybdenum sulfur clusters with HgI2 ; dithiophosphinato Mo—S—Hg clusters, crystal structure, 31P NMR studies of trinuclear Mo—S—Hg clusters ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Peripheral Bonding of Mercury(II) Iodide to Trinuclear Molybdenum-Sulfur-Dithiophosphinato Clusters: [Mo3S4(R2PS2)4HgI2] (R = Et, Pr)Reaction of Mo3S4(R2PS2)4 1 (a: R = Et, b: R = Pr) with HgI2 in THF yields the diamagnetic title complexes [Mo3S4(R2PS2)4HgI2] 3. The crystal structure of [3a (H2O)] · 2 CH2Cl2 shows the complexes to consist of a triangular array of Mo atoms which are bridged by μ2—S atoms and capped by a μ3—S atom. Each of the Mo atoms is chelated by a dithiophosphinato ligand Et2PS2- and in addition two Mo atoms are bridged by a Et2PS2- ligand while the H2O molecule is bonded weakly to the third Mo atom. Thus, all Mo atoms reveal a distorted octahedral coordination sphere. HgI2 is „peripherally“ bonded to the cluster via two S atoms, one of which belongs to a chelating ligand and the other one to the bridging ligand. Space group P1, lattice constants a = 12.157(2), b = 15.284(3), c = 16.049(3) Å, α = 115.56(1), β = 107.35(1), and γ = 94.62(1)°; Z = 2, dcalc = 2.23 mg/mm3; 4 236 observed reflections, R = 0.068. In organic solvents complexes 3 are strong electrolytes. VT-31P NMR data suggest a stepwise dissociation of 3 with formation of [Mo3S4(R2PS2)3] +[(R2PS2)HgI2]- and elimination of the bridging ligand from the cluster.
    Notes: Die Reaktion von Mo3S4(R2PS2)4 1 (a: R = Et, b: R = Pr) mit HgI2 in THF ergibt die diamagnetischen Komplexe [Mo3S4(R2PS2)4HgI2] 3. Die Kristallstrukturanalyse von [3a (H2O)] · 2 CH2Cl2 zeigt eine triangulare Anordnung der Mo-Atome, die durch μ2—S-Atome verbrückt und durch ein μ3—S-Atom überdacht sind. Jedes Mo-Atom ist durch einen Dithiophosphinatoliganden Et2PS2- chelatisiert, ein weiterer Et2PS2--Ligand verbrückt zwei Mo-Atome, während ein H2O nur schwach an das dritte Mo-Atom gebunden ist. Somit ist jedes Mo-Atom verzerrt oktaedrisch koordiniert. HgI2 ist „peripher“ an den Cluster über je ein S-Atom eines Chelatliganden und des Brückenliganden gebunden. Raumgruppe P1, Gitterkonstanten a = 12,157(2), b = 15,284(3), c = 16,049(3) Å, α = 115,56(1), β = 107,35(1) und γ = 94,62(1)°; Z = 2, dber = 2,23 mg/mm3; 4 236 beobachtete Reflexe, R = 0,068. In organischen Lösungsmitteln sind die Komplexe 3 starke Elektrolyte. Gemäß VT-31P-NMR-Messungen wird eine schrittweise Dissoziation von 3 vorgeschlagen, wobei sich unter Eliminierung des Brückenliganden aus dem Cluster [Mo3S4(R2PS2)3] +[(R2PS2)HgI2]- bildet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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