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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1167-1169 
    ISSN: 0009-2940
    Keywords: Anion-cation interactions ; Carbonyl metalates ; Chromium complexes ; Molybdenum complexes ; Tungsten complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of KSi with M(CO)6 (M=Cr, Mo, W) and Cr(CO)5NMe3 - Crystal Structure of [K(DME)2]2[Cr2(CO)10] (DME=1.2-Dimethoxyethane)M(CO)6 (M=Cr, Mo, W) and Cr(CO)5NMe3 are reduced by KSi in DME during several days with formation of the anions [M2(CO)10]2⊖. These can be obtained from a DME/toluene solution as pale yellow or orange crystals of [K(DME)2]2[M2(CO)10] [M=Cr (1), Mo (2), W (3)]. A crystal structure determination of the chromium compound shows that strong interactions between the [Cr2(CO)10]2⊖ and the K⊕ ions exist in the solid state, leading to the formation of one-dimensional polymeric chains. 2 and 3 are isomorphous to 1 (powder diffraction, Rietveld method).
    Additional Material: 3 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1815-1819 
    ISSN: 0009-2940
    Keywords: Alkyne insertion ; Ethenyl ligands, 2-(silylphosphanyl)- ; Zirconocenes ; Zirconium complexes ; Phosphido ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Regiospecific Insertion of Phenylacetylene into the Zr—P bond of Cp2Zr{P(SiMe3)2}(Cl) and Derivatives of the Insertion Product (Z)-Cp2Zr{C(Ph) = C(H)P(SiMe3)2}(Cl)The reaction of Cp2Zr{P(SiMe3)2}(Cl) (1) with phenylacetylene in boiling toluene yields regiospecifically the insertion product (Z)-Cp2Zr{C(Ph) = C(H)P(SiMe3)2}(Cl) (2) which reacts with MeLi or nBuLi by forming the corresponding alkyl-substituted zirconocene derivatives (Z)-Cp2Zr{C(Ph) = C(H)P(SiMe3)2}(R) [R = Me (3), nBu (4)]. The attempt to prepare the C(Ph) = C(H)P(SiMe3)2- ligand directly from Li(THF)2P(SiMe3)2 and phenylacetylene yields HP(SiMe3)2 and LiC≡CPh. An X-ray structure determination of 2 and 3 was carried out.
    Additional Material: 1 Ill.
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  • 3
    ISSN: 0009-2940
    Keywords: Methylcyclopentadeienyl molybdenum(V) tetrachloride ; Primary Phosphane ligands ; EPR spetroscopy ; Molybdenum ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: [Cp′MoCl4(CH3CN) (Cp′=C5H4Me) react with 2,4,6-triisopropylphenylphosphane or cyclohexylphosphane to give the phosphane complexes [Cp′MoCl4(PH2R)] [R=2,4,6-Pri3C6H2 (1)]. 1 and 2, were characterized spectroscopically (IR, MS) and by crystal structure determinations. EPR investigations in liquid and frozen solution confirmed the presence of Mo(V) species and the data were used to analyze the spin-density distribution in the first coordination sphere.
    Additional Material: 4 Ill.
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  • 4
    ISSN: 0044-2313
    Keywords: Phosphido-bridged dinuclear complexes ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphido- and Arsenido-bridged Dinuclear Complexes. Synthesis and Molecular Structure of (η5-C5H4R)2Zr{μ-P(SiMe3)2}2M(CO)4 (R = Me, M = Cr; R = H, M = Mo) and Synthesis of (η5-C5H5)2Zr{μ-As(SiMe3)2}2Cr(CO)4The reaction of (η5-C5H4R)2Zr{E(SiMe3)2}2 with M(CO)4(NBD) (NBD = norbornadiene) yields the dinuclear phosphido- or arsenido-bridged complexes (η5-C5H4R)2Zr{μ-E(SiMe3)2}2M(CO)4 (R = Me, E = P, M = Cr (1); R = H, E = P, M = Mo (2); R = H, E = As, M = Cr (3)). No formation of dinuclear complexes was observed in the reaction of (η5-C5H4Me)2Zr{P(SiMe3)2}2 with Ni(PEt3)4, Ni(CO)2(PPh3)2 or with NiCl2(PPh3)2 in the presence of Mg. Complexes 1-3 were characterised spectroscopically (i. r., n. m. r., m. s.), and X-ray structure investigations were carried out on 1 and 2. The central four-membered ZrP2M ring is slightly puckered (dihedral angle between planes ZrP2/CrP2 14.7°, ZrP2/MoP2 14.2°). The Zr—P bond lengths are equivalent (1: Zr—P1 2.654(4), Zr—P2 2.657(4) Å; 2: Zr—P1 2.6711(9), Zr—P2 2.6585(7) Å), as are the M—P bond lengths (M = Cr (1): Cr—P1 2.513(4), Cr—P2 2.502(4) Å; M = Mo (2): Mo—P1 2.6263(7), Mo—P2 2.6311(10) Å). The long Zr ··· M distances of 3.414 Å (M = Cr (1)) and 3.461 Å (M = Mo (2)) indicate the absence of a metal-metal bond.
    Notes: Die Reaktion von (η5-C5H4R)2Zr{E(SiMe3)2}2 mit M(CO)4(NBD) (NBD = Norbornadien) liefert die phosphido- oder arsenido-verbrückten Zweikernkomplexe (η5-C5H4R)2Zr{μ-E(SiMe3)2}2M(CO)4 (R = Me, E = P, M = Cr (1); R = H, E = P, M = Mo (2); R = H, E = As, M = Cr (3)). Hingegen führen die Umsetzungen von (η5-C5H4Me)2Zr{P-(SiMe3)2}2 mit Ni(PEt3)4, Ni(CO)2(PPh3)2 oder mit NiCl2(PPh3)2 in Gegenwart von Mg nicht zu entsprechenden Zweikernkomplexen. Die Verbindungen 1-3 wurden spektroskopisch charakterisiert (IR, NMR, MS), 1 und 2 zusätzlich durch eine Röntgenstrukturanalyse. Der zentrale Vierring ZrP2M ist leicht gewellt (Diederwinkel zwischen den Ebenen ZrP2/CrP2 14,7°, ZrP2/MoP2 14,2°). Die Zr—P- oder M—P-Bindungslängen sind nahezu gleich (1: Zr—P1 2,654(4), Zr—P2 2,657(4) Å, Cr—P1 2,513(4), Cr—P2 2,502(4) Å; 2: Zr—P1 2,6711(9), Zr—P2 2,6585(7) Å; Mo—P1 2,6263(7), Mo—P2 2,6311(10) Å). Der lange Zr ··· M-Abstand von 3,414 Å (M = Cr (1)) und 3,461 Å (M = Mo (2)) weist auf das Fehlen einer Metall-Metall-Bindung hin.
    Additional Material: 2 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1255-1258 
    ISSN: 0044-2313
    Keywords: Zirconocene ; Phosphanido-bridged dinuclear complexes ; racemic isomer ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterobimetallic Phosphanido-bridged Dinuclear Complexes - Syntheses of cis-rac-[(η-C5H4R)2Zr{μ-PH(2,4,6-iPr3C6H2)}2M(CO)4] (R=Me, M=Cr, Mo; R=H, M=Mo)The zirconocene bisphosphanido complexes [(η-C5H4R)2Zr{PH(2,4,6-iPr3C6H2)}2] (R=Me, H) react with [(NBD)M(CO)4] (NBD=norbornadiene, M=Cr, Mo) to give only one diastereomer of the phosphanido-bridged heterobimetallic dinuclear complexes cis-rac-[(η-C5H4R)2Zr{μ-PH(2,4,6-iPr3C6H2)}2M(CO)4] [R=Me, M=Cr (1), Mo (2); R=H, M=Mo (3)]. However, no reaction was observed between [(η-C5H5)2Zr{PH(2,4,6-tBu3 C6H2)}2] and [Pt(PPh3)4]. 1 - 3 were characterised spectroscopically. For 1 - 3, the presence of the racemic isomer was shown by NMR spectroscopy. No reaction was observed at room temperature for 3 and CS2, (NO)BF4, Me3NO or PH(2,4,6-Me3C6H2)2. With Et2AlH or PhC≡CH decomposition of 3 was observed.
    Notes: Die Zirconocen-Bisphosphanido-Komplexe [(η-C5H4R)2Zr{PH(2,4,6-iPr3C6H2)}2] (R=Me, H) setzen sich mit [(NBD)M(CO)4] (NBD=Norbornadien, M=Cr, Mo) zu den diastereomeren-reinen phosphanido-verbrückten heterobimetallischen Zweikern-Komplexen cis-rac-[(η-C5H4R)2Zr{μ-PH(2,4,6-iPr3C6H2)} 2M(CO)4] [R=Me, M=Cr (1), Mo (2); R=H, M=Mo (3)] um. Hingegen wird keine Reaktion von [(η-C5H5)2Zr{PH(2,4,6-t Bu3C6H2)}2] mit [Pt(PPh3)4] beobachtet. 1 - 3 wurden spektroskopisch charakterisiert. NMR-spektroskopisch kann für 1 - 3 das Vorliegen des racemischen Isomers gezeigt werden. 3 reagiert bei Raumtemperatur nicht mit CS2, (NO)BF4, Me3NO und PH(2,4,6-Me3C6H2)2. Mit Et2AlH und PhC≡CH wird Zersetzung beobachtet.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 615 (1992), S. 35-38 
    ISSN: 0044-2313
    Keywords: Zirconocene-phosphido complexes ; (tricyclohexyltriphosphane-1,3-diyl)zirconocene(IV) ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of meso-(1,2,3-Tricyclohexyltriphosphane-1,3-diyl)zirconocene(IV), Cp2(Cp = η5-C5H5, Cy = C6H11)Cp2ZrCl2 reacts with Li(THF)2PHCy (Cy = C6H11) to yield the metallacyclic compound Cp2 1., The 31P{1H} NMR spectrum of 1, shows a coupling pattern for an A2X system, indicating the presence of only the meso-forms in solution, which are also present in the solid state. 1, crystallizes in the monoclinic space group P21/n (No. 14) with a = 12.984(8), b = 9.241(7), c = 23.05(1) Å, β = 93.48(4)°, V = 2760.1 Å3 and four formula units in the unit cell (2718 independent observed reflections, R = 7.3%). The central ZrP3 ring in 1, is almost planar. The Zr—P bond lengths of 2.618(4) and 2.628(4) Å are nearly identical.
    Notes: Cp2ZrCl2 setzt sich mit Li(THF)2PHCy (Cy = C6H11) zu der metallacyclischen Verbindung Cp2 1, um. Im 31P{1H}-NMR-Spektrum von 1, tritt das für ein A2X-System zu erwartende Aufspaltungsmuster auf, was auf das Vorliegen der meso-Formen in Lösung hinweist. Auch im Festkörper liegen nur die meso-Formen vor. 1, kristallisiert monoklin in der Raumgruppe P21/n (Nr. 14) mit a = 12,984(8), b = 9,241(7), c = 23,05(1) Å, β = 93,48(4)°, V = 2760,1 Å3 und vier Formeleinheiten pro Elementarzelle (2718 unabhängige beobachtete Reflexe, R = 7,3%). Der zentrale ZrP3-Ring in 1, ist angenähert planar. Die Zr—P-Bindungslängen sind mit 2,618(4) und 2,628(4) Å fast gleich.
    Additional Material: 1 Ill.
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  • 7
    ISSN: 0044-2313
    Keywords: Cyclopentadienyl molybdenum(V) and (III) complexes ; diphenylphosphido bridged complex ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Cyclopentadienyl Substituted Molybdenum(V) Tetrachlorides with LiPH(2,4,6-Bu3tC6H2) and KPPh2(Dioxane)2. Crystal Structures of [Cp0Mo(μ—Cl)2]2 and [Cp20Mo2(μ—Cl)3(μ—PPh2)] (Cp0 = C5Me4Et)The reaction of [Cp0Mo(CO)3]2 (Cp0 = C5Me4Et) and [Cp′Mo(CO)3]2 (Cp′ = C5H4Me) with PCl5 in CH3CN furnishes the Mo(V) complexes Cp0MoCl4(CH3CN) 1 and Cp′MoCl4(CH3CN) 2 in good yields. While 1 and 2 are reduced by LiPH(2,4,6-Bu3tC6H2) to the Mo(III) complexes [Cp0Mo(μ—Cl)2]2 3 and [Cp′Mo(μ—Cl)2]2 4, the reaction of 1 with KPPh2(dioxane)2 yields the reduction/substitution product [Cp20Mo2(μ—Cl)3(μ—PPh)] 5 in low yield. 1-4 were characterized spectroscopically (i.r., mass, 3 and 4 also n.m.r.). An X-ray crystal structure determination was carried out on 3 and 5. 3 crystallizes in the triclinic space group P1 (No. 2) with a = 8.278(4), b = 12.508(7), c = 12.826(7) Å, α = 86.78(5), β = 81.55(2), γ = 75.65(4)°, V = 1 272.4 Å3 and two formula units in the unit cell (data collection at - 67°C, 4 255 independent observed reflections, R = 2.9%); 5 crystallizes in the triclinic space group P1 (No. 2) with a = 11.536(8), b = 12.307(9), c = 13.157(9) Å, α = 91.41(6), β = 100.42(5), γ = 112.26(6)°, V = 1 688.7 Å3 and two formula units in the unit cell (data collection at - 60°C, 6 147 independent observed reflections, R = 4.9%). The crystal structure of 3 shows the presence of centrosymmetric dimeric molecules with four bridging chloro ligands. In 5, two Mo atoms are bridged by three chloro ligands and one PPh2 ligand. The Mo—Mo bond length in 3 and 5 (2.600(2), 2.596(2) Å and 2.6388(8) Å) is in agreement with a Mo—Mo bond.
    Notes: Durch die Umsetzung von [Cp0Mo(CO)3]2 (Cp0 = C5Me4Et) und [Cp′Mo(CO)3]2 (Cp′ = C5H4Me) mit PCl5 in CH3CN sind die Mo(V)-Komplexe Cp0MoCl4(CH3CN) 1 und Cp′MoCl4(CH3CN) 2 in guten Ausbeuten zugänglich. 1 und 2 werden durch LiPH(2,4,6-Bu3tC6H2) zu den Mo(III)-Komplexen [Cp0Mo(μ—Cl)2]2 3 und [Cp′Mo(μ—Cl)2]2 4 reduziert. Hingegen fällt bei der Umsetzung von 1 mit KPPh2(Dioxan)2 [Cp20Mo2(μ—Cl)3(μ—PPh2)] 5, das durch Reduktion und Substitution gebildet wird, in geringer Ausbeute an. 1-4 wurden IR-spektroskopisch und massenspektrometrisch, 3 und 4 auch NMR-spektroskopisch charakterisiert. An 3 und 5 wurden Röntgenstrukturanalysen durchgeführt. 3 kristallisiert triklin in der Raumgruppe P1 (Nr. 2) mit a = 8,278(4), b = 12,508(7), c = 12,826(7) Å, α = 86,78(5), β = 81,55(2), γ = 75,65(4)°, V = 1 272,4 Å3 und zwei Formeleinheiten pro Elementarzelle (Meßtemperatur - 67°C, 4 255 unabhängige, beobachtete Reflexe, R = 2,9%); 5 kristallisiert triklin in der Raumgruppe P1 (Nr. 2) mit a = 11,536(8), b = 12,307(9), c = 13,157(9) Å, α = 91,41(6), β = 100,42(5), γ = 112,26(6)°, V = 1 688,7 Å3 und zwei Formeleinheiten pro Elementarzelle (Meßtemperatur - 60°C, 6 147 unabhängige, beobachtete Reflexe, R = 4,9%). In 3 liegen zentrosymmetrische dimere Moleküle mit vier verbrückenden Chloroliganden vor. In 5 sind zwei Mo-Atome durch drei Chloroliganden und einen PPh2-Liganden verbrückt. Der Mo—Mo-Bindungsabstand in 3 und 5 (2,600(2), 2,596(2) Å und 2,6388(8) Å) weist auf das Vorliegen einer Mo—Mo-Bindung hin.
    Additional Material: 5 Ill.
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  • 8
    ISSN: 0044-2313
    Keywords: Zirconocene alkynyl alkenyl complex ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of the Zirkonocene Alkynyl Alkenyl Complex (Z)—Cp2Zr(C≡CPh){C(Ph) = C(H)P(SiMe3)2}The reaction of (Z)—Cp2Zr(C(Ph) = C(H)P(SiMe3)2}(Cl) with lithium phenylacetylide yields the zirconocene alkynyl alkenyl complex (Z)—Cp2Zr(C≡CPh){C(Ph) = C(H)P(SiMe3)2} (1). 1 was characterised spectroscopically (IR, NMR, MS) and by X-ray structure determination. The complex crystallises triclinic in the space group P1 with a = 10.561(10), b = 11.226(12), c = 14.274(13) Å, α = 70.87(7), β = 77.70(7), γ = 77.85(7)°. In 1, there are two different Zr—C bond distances (Zr—C(=C) 2.415(6), Zr—C(≡C) 2.309(6) Å). A Zr—P interaction (Zr—P 2.774(3) Å) is observed in the solid state.
    Notes: Die Reaktion von (Z)—Cp2Zr{C(Ph) = C(H)P(SiMe3)2}(Cl) mit Lithiumphenylacetylid liefert den Zirkonocen-Alkinyl-Alkenyl-Komplex (Z)—Cp2Zr(C≡CPh){C(Ph) = C(H)P(SiMe3)2} (1). 1 wurde spektroskopisch (IR, NMR, MS) und röntgenstrukturanalytisch charakterisiert. Die Verbindung kristallisiert triklin in der Raumgruppe P1 mit a = 10,561(10), b = 11,226(12), c = 14,274(13) Å, α = 70,87(7), β = 77,70(7), γ = 77,85(7)°. 1 weist zwei unterschiedliche Zr—C-Bindungslängen auf (Zr—C(=C)) 2,415(6), Zr—C(≡C) 2,309(6) Å). Im Festkörper wird eine Zr—P-Wechselwirkung beobachtet (Zr—P 2,774(3) Å).
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  • 9
    ISSN: 0044-2313
    Keywords: Hafnocene monoarsenido complex ; Insertion reactions ; Crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Insertion Reactions of Cp2′HfCl{As(SiMe3)2} (Cp′ = C5H4Me)The reaction of Cp2′HfCl2 (Cp′ = C5H4Me) with Li(THF)2,5As(SiMe3)2 (1 : 1) at room temperature gives the terminal hafnocene arsenido complex Cp2′HfCl{As(SiMe3)2} (1) in high yield. 1 inserts CS2 and PhNC into the Hf—As bond yielding Cp2′HfCl{η2-S2CAs(SiMe3)2} (2) and Cp2′HfCl{η2-N(Ph)CAs(SiMe3)2} (3). The thermally sensitive complexes 1-3 were characterised spectroscopically and crystal structure determinations were carried out on 1 and 3 which shows the η2 bonding mode of the N(Ph)CAs(SiMe3)2 ligand in the latter.
    Notes: Die Reaktion von Cp2′HfCl2 (Cp′ = C5H4Me) mit Li(THF)2,5As(SiMe3)2 (1 : 1) bei Raumtemperatur liefert den terminalen Hafnocen-Monoarsenido-Komplex Cp2′HfCl{As(SiMe3)2} (1) in guter Ausbeute. 1 reagiert mit CS2 oder PhNC unter Insertion in die Hf—As-Bindung und Bildung von Cp2′HfCl{η2-S2CAs(SiMe3)2} (2) und Cp2′HfCl{η2-N(Ph)CAs(SiMe3)2} (3). Die thermisch labilen Verbindungen 1-3 wurden spektroskopisch charakterisiert; an 1 und 3 wurden Röntgenstrukturanalysen durchgeführt. Demnach liegt in 3 ein η2-koordinierter N(Ph)CAs(SiMe3)2-Ligand vor.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 689-691 
    ISSN: 0044-2313
    Keywords: Cyclohexaarsine ligand ; transition metal complexes ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses and Characterization of [Ni(tBuAs)6] and [Pd(tBuAs)6]The reduction of tBuAsCl2 with magnesium in the presence of NiCl2 or PdCl2 yields the complexes [Ni(tBuAs)6] (2) and [Pd(tBuAs)6] (3). The structure of (2) was determined by X-ray single crystal structure analysis. (2) consists of the sixmembered ring (tBuAs)6 in chair conformation with the nickel atom in the center of this ring.
    Notes: Bei der Reduktion von tBuAsCl2 mit Magnesium in Gegenwart von NiCl2 oder PdCl2 werden die Komplexe [Ni(tBuAs)6] (2) und [Pd(tBuAs)6] (3) gebildet. Die Struktur von (2) wurde durch Einkristall-Röntgenstrukturanalyse bestimmt. (2) besteht aus dem (tBuAs)6-Sechsring mit Sesselkonformation, in dessen Zentrum das Nickelatom koordiniert ist.
    Additional Material: 1 Ill.
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