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  • 1
    ISSN: 0570-0833
    Keywords: clusters ; imido ligands ; transition metal compounds ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses and Structures of the Phosphorus and Nitrogenbridged Transition Metal Complexes [Pd(NPhPPh2)(PPh3)]2, [Pd(NPhPPh2)2 · Li(thf)]2, [Pd(NPhPPh2)Cl · Li(thf)3]2, [M(NPhPPh2)(HNPhPPh2)]2 (M=Pd, Pt), [M{Ph2P(NPh)2}2] (M=Co, Ni), [Ni(PPh2){Ph2P(NPh)2}]2 and [Ni2(PPh2)(NPhPPh2)(HNPhPPh2)3].From the reaction of LiNPhPPh2 with Palladium-Nickel- and Cobaltcomplexes, depending on the reaction conditions, different monomeric and dimeric complexes can be isolated. In these compounds the (NPhPPh2)--group acts as both a bridging and as a terminal ligand. [Pd(NPhPPh2)(PPh3)]2 (1), [Pd(NPhPPh2)2 · Li(thf)]2 (2) and [Pd(NPhPPh2)Cl · Li(thf)3]2 (3) are formed from the reaction of [PdCl2(PPh3)2] or [PdCl2(COD)] with LiNPhPPh2. In contrast to this from the reaction of Pd(Ac)2 and HNPhPPh2 (in the presence of zinc-dust) or [PtCl2(py)2] and LiNPhPPh2.
    Notes: Bei der Reaktion von LiNPhPPh2 mit Komplexen des Palladium, Cobalt und Nickel können je nach den Reaktionsbedingungen unterschiedliche einkernige und zweikernige Komplexe isoliert werden, in denen die (NPhPPh2)--Gruppe als Brücke bzw. endständiger Ligand vorliegt. [Pd(NPhPPh2)(PPh3)]2 (1), [Pd(NPhPPh2)2 · Li(thf)]2 (2) und [Pd(NPhPPh2)Cl · Li(thf)3]2 (3) werden bei der Umsetzung von [PdCl2(PPh3)2] bzw. [PdCl2(COD)] mit LiNPhPPh2 gebildet. Dagegen erhält man aus Pd(Ac)2 und HNPhPPh2 (in Gegenwart von Zinkstaub) bzw. [PtCl2(py)2] und LiNPhPPh2 die zweikernigen Komplexe [M(NPhPPh2)(HNPhPPh2)]2 (M = Pd: 4; M = Pt: 5). Die Umsetzung von [MCl2(PR3)2] (M = Ni: R = Ph, iPr; M = Co: R = Ph) führt dagegen zur Bildung der einkernigen Verbindungen [M{Ph2P(NPh)2}2] (M = Ni: 6; M = Co: 7) und des zweikernigen Komplexes [Ni(PPh2){Ph2P(NPh)2}]2 (8). Wird [NiCl2(PPh3)2] mit HNPhPPh2 in Gegenwart von Zinkstaub zur Reaktion gebracht, entsteht [Ni2(PPh2)(NPhPPh2)(HNPhPPh2)3] (9). Die Strukturen von 1-9 konnten mit Hilfe der Röntgenstrukturanalyse aufgeklärt werden. 1-9 besitzen folgende Gitterkonstanten und Raumgruppen:(1: Raumgruppe P1 (Nr. 2), Z = 2, a = 1193,0(4) pm, b = 1325,5(5) pm, c = 1447,2(7) pm, α = 97,01(3)°, β = 112,69(3)°, γ = 115,75(3)°; 2: Raumgruppe P1 (Nr. 2), Z = 2, a = 1264,1(13) pm, b = 1281,7(12) pm, c = 1448,0(2) pm, α = 113,01(6)°, β = 92,99(8)°, γ = 117,28(8)°; 3: Raumgruppe P1 (Nr.2) Z = 2, a = 1094,3(8) pm, b = 1197,5(12) pm, c = 1313,7(17) pm, α = 110,22(6)°, β = 101,33(6)°, γ = 106,45(5)°; 4: Raumgruppe P21/n (Nr. 14), Z = 4, a = 1490,1(4) pm, b = 1336,0(3) pm, c = 1746,9(6) pm, β = 97,52(3)°; 5: Raumgruppe P21/n (Nr. 14), Z = 4, a = 1486,7(2) pm, b = 1332,0(10) pm, c = 1749,0(2), β = 97,65(10)°, 6: Raumgruppe C2/c (Nr. 15), Z = 4, a = 1114,2(2) pm, b = 1722,7(3) pm, c = 2104,6(4) pm, β = 98,70(3); 7: Raumgruppe C2/c (Nr. 15), Z = 4, a = 1110,1(2) pm, b = 1714,3(3) pm, c = 2090,8(4) pm, β = 98,38(3)°; 8: Raumgruppe P1 (Nr. 2), Z = 2, a = 984,40(7) pm, b = 1189,7(8) pm, c = 1412,2(8) pm, γ = 101,49(5)°, β = 97,81(5), γ = 109,24(5); 9: Raumgruppe P1 (Nr. 2), Z = 2, a = 1402,1(9) pm, b = 1416,9(13) pm, c = 2230,0(2) pm, γ = 84,67(7)°, β = 84,98(6)°, γ = 65,72(6)°).
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  • 3
    ISSN: 0044-2313
    Keywords: Octatelluride, Synthesis, Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: [K(15-Crown-5)2]2Te8 - a Bicyclic PolytellurideThe octatelluride [K(15-crown-5)2]2Te8 has been synthesized by the oxydation of a potassium tritelluride solution in dimethylformamide by iron(III) chloride in the presence of 15-crown-5, forming black crystals, which were characterized by an X-ray structure determination. Space group Pca21, Z = 4, 4 548 observed unique reflections, R = 0.048. Lattice dimensions at -70°C: a = 1 881(1), b = 2 211(2), c = 1 530(1) pm. The structure consists of cations [K(15-crown-5)2]+, in which the potassium ions are sandwichlike coordinated by the oxygen atoms of the two disordered crown ether molecules, and of bicyclic Te82- ions. In these anions a Te2+ ion is chelated in a planar fashion by a Te32- and a Te42- unit.
    Notes: Das Octatellurid [K(15-Krone-5)2]2 Te8 entsteht durch Oxydation einer Kaliumtritelluridlösung in Dimethylformamid durch Eisen(III)-chlorid in Gegenwart von 15-Krone-5 als schwarze Kristalle, die wir durch eine röntgenographische Strukturanalyse charakterisiert haben. Raumgruppe Pca21, Z = 4, 4 548 beobachtete unabhängige Reflexe, R = 0,048. Gitterabmessungen bei -70°C: a = 1 881(1), b = 2 211(2), c = 1 530(1) pm. Die Struktur besteht aus Kationen [K(15-Krone-5)2]+, in denen die Kaliumionen sandwichartig von den O-Atomen der fehlgeordneten Kronenethermoleküle umgeben sind, und aus bicyclischen Te82--Ionen. In ihnen ist ein Te2+-Ion planar von je zwei Te-Atomen eines Te32-- und eines Te42--Ions chelatartig umgeben.
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  • 4
    ISSN: 0044-2313
    Keywords: Polyselenido Complex of Mercury ; Synthesis ; 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 [Na(12-Crown-4)2]2[Hg(Se4)2] · 1.5 DMF.The title compound has been prepared by the reaction of Na2Se4 with mercury acetate in DMF solution in the presence of 15-crown-5, forming dark red crystal needles. [Na(12-crown-4)2]2[Hg(Se4)2] · 1.5 DMF crystallizes in the space group C2/c with eight formula units per unit cell. The structure was determined with 3 824 observed unique reflections, R = 0.085. Lattice dimensions at - 70°C: a = 2 884(2), b = 1 407.7(7), c = 2 843(2) pm, β = 93.93(5)°. The structure consists of [Na(12-crown-4)2]+ ions with a sandwichlike coordination of the crown ether molecules, and of [Hg(Se4)2]2- ions, in which the mercury atom is coordinated by two tetraselenido ions in a chelating fashion. The [Hg(Se4)2]2- ions are arranged to infinite chains via Se…Se contacts.
    Notes: Die Titelverbindung entsteht in Form dunkelroter Kristallnadeln bei der Reaktion von Na2Se4 mit Quecksilberacetat bei Gegenwart von 15-Krone-5 in Dimethylformamidlösung. [Na(12-Krone-4)2]2[Hg(Se4)2] · 1,5 DMF kristallisiert monoklin in der Raumgruppe C2/c mit acht Formeleinheiten pro Elementarzelle. Strukturlösung mit 3 824 unabhängigen beobachteten Reflexen, R = 0,085. Gitterkonstanten bei - 70°C: a = 2 884(2), b = 1 407,7(7), c = 2 843(2) pm, β = 93,93(5)°. Die Verbindung besteht aus [Na(12-Krone-4)2]+-Ionen mit sandwichartigem Aufbau und [Hg(Se4)2]2--Ionen, in denen das Quecksilberatom chelatartig von zwei Tetraselenidionen koordiniert ist. Die [Hg(Se4)2]2--Ionen sind über interionische Se…Se-Kontakte zu Strängen angeordnet.
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  • 5
    ISSN: 0044-2313
    Keywords: Crown ether complexes of lead ; syntheses ; ir. spectra ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crown Ether Complexes of Lead(II). The Crystal Structures of [PbCl(18-Krone-6)][SbCl6], [Pb(18-Krone-6)(CH3CN)3][SbCl6]2 und [Pb(15-Krone-5)2][SbCl6]2.[PbCl(18-crown-6)][SbCl6] has been prepared in low yield besides [Pb(CH3)2(18-crown-6)][SbCl6]2 by the reaction of Pb(CH3)2Cl2 with antimony pentachloride in acetonitrile solution in the presence of 18-crown-6, forming pale-yellow crystals. The other two title compounds are formed as colourless crystals by the reaction of PbCl2 with antimony pentachloride in acetonitrile solutions in the presence of 18-crown-6 and 15-crown-5, respectively. The complexes were characterized by IR spectroscopy and by crystal structure determinations.[PbCl(18-crown-6)][SbCl6]: Space group P21/c, Z = 8, 5 003 observed unique reflections, R = 0.046. Lattice dimensions at - 80°C: a = 1 386.9; b = 1 642.7; c = 2 172.1 pm, β = 92.95°. The lead atom in the cation [PbCl(18-crown-6)]+ is surrounded in an almost hexagonal-planar construction by the six oxygen atoms of the crown ether and an axially oriented Cl atom.[Pb(18-crown-6)(CH3CN)3][SbCl6]2: Space group P1, Z = 2, 6 128 observed unique reflections, R = 0.076. Lattice dimensions at - 70°C: a = 1 228.0; b = 1 422.9; c = 1 463.2 pm, α = 69.08°; β = 65.71°; γ = 64.51°. In the cation [Pb(18-crown-6)(CH3CN)3]2+ the lead atom is coordinated by the six oxygen atoms of the crown ether and by the three nitrogen atoms of the acetonitrile molecules. The structure determination is restricted by disorder.[Pb( 15-crown-5)2][SbCI6]2: Space group P63/m, Z = 6, 5 857 observed unique reflections, R = 0.059. Lattice dimensions at -70°C: a = b = 2 198.5; c = 1499.4 pm, α = β = 90°, γ = 120°. In the cation [Pb(l5-crown-5)2]2 the lead atom is sandwich-like coordinated by the ten oxygen atoms of the two crown ether molecules. The structure determination is restricted by disorder.
    Notes: [PbCl(18-Krone-6)][SbCl6] entsteht in geringer Menge neben [Pb(CH3)2(18-Krone-6)][SbCl6]2 in Form blaßgelber Kristalle bei der Einwirkung von Antimonpentachlorid auf Pb(CH3)2Cl2 in Acetonitrillösung in Gegenwart von 18-Krone-6. Die beiden übrigen Titelverbindungen werden aus PbCl2 und 18-Krone-6 bzw. 15-Krone-5 durch Reaktion mit Antimonpentachlorid in Acetonitril als farblose Kristalle erhalten. Die Komplexe wurden durch ihre IR-Spektren und durch Kristallstrukturanalysen charakterisiert.[PbCl(18-Krone-6)][SbCl6]: Raumgruppe P21/c, Z = 8, 5 003 beobachtete unabhängige Reflexe, R = 0,046. Gitterkonstanten bei - 80°C: a = 1 386,9; b = 1 642,7; c = 2 172,1 pm, β = 92,95°. In dem Kation [PbCl(18-Krone-6)]+ ist das Pb-Atom nahezu coplanar mit den sechs O-Atomen des Kronenethers angeordnet, während das Chloratom kovalent und axial mit dem Pb-Atom verbunden ist.[Pb(18-Krone-6)(CH3CN)3][SbCl6]2: Raumgruppe P1, Z = 2, 6 128 beobachtete unabhängige Reflexe, R = 0,076. Gitterkonstanten bei - 70°C: a = 1 228,0; b = 1 422,9; c = 1 463,2 pm, α = 69,08°; β = 65,71°; γ = 64,51°. In dem Kation [Pb(18-Krone-6)(CH3CN)3]2+ ist das Bleiatom neunfach durch die sechs O-Atome des Kronenethers und durch drei N-Atome der Acetonitrilmoleküle koordiniert. Die Genauigkeit der Strukturbestimmung ist durch Fehlordnung beeinträchtigt.[Pb(15-Krone-5)2][SbCl6]2: Raumgruppe P63/m, Z = 6, 5 857 beobachtete unabhängige Reflexe, R = 0,059. Gitterkonstanten bei - 70°C: a = b = 2 198,5; c = 1 499,4 pm, α = β = 90°, γ = 120°. In dem Kation [Pb(15-Krone-5)2]2+ ist das Bleiatom zehnfach sandwichartig durch die O-Atome der beiden Kronenethermoleküle koordiniert. Die Genauigkeit der Strukturbestimmung ist durch Fehlordnung beeinträchtigt.
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  • 6
    ISSN: 0044-8249
    Keywords: Clusterverbindungen ; Imidoliganden ; Übergangsmetallverbindungen ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
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