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  • Artikel: DFG Deutsche Nationallizenzen  (172)
  • Chemistry  (172)
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  • Artikel: DFG Deutsche Nationallizenzen  (172)
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  • 1
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 1494-1498 
    ISSN: 0947-6539
    Schlagwort(e): arsenic ; cobalt ; density functional calculations ; structural elucidation ; Zintl anions ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: [As7(SiMe3)3] reacts with [(Cp*CoCl)2] to give black crystals of the ionic compound [(Cp*Co)3As6][CoCl4] (1). The cation [(Cp*Co)3As6]2+ consists of an As6 prism, with squares capped by [Cp*Co] fragments. When [(CptBuCoCl)2] is used instead of [(Cp*CoCl)2] in the reaction, dark red crystals of [(CptBuCo)3As6][CoCl3(thf)]2 (2) and green-black crystals of [(CptBuCo)2As4][Co3Cl8(thf)2] (3) can be obtained. The cation in 2 shows a structure very similar to that of 1. The [(CptBuCo)2As4]2+ cations in 3 can be described as a triple-decker sandwich complex with two [CptBuCo]+ fragments bridged by an As4 ligand. Density functional calculations reproduce the experimental data of 1 and 3 and allow an interpretation of molecular electronic structure and bonding in these and related compounds with As replaced by P and Co by Fe.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 99-104 
    ISSN: 0947-6539
    Schlagwort(e): bipyridines ; copper compounds ; selfassembly ; supramolecular chemistry ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The newly synthesised ligand 2 combines binding components known to undergo specific and distinct self-assembly processes with Cu1 ions. It complexes Cu1 to form, in almost quantitative yield, a large inorganic architecture 1 made up from four ligand molecules and twelve metal ions. The structure of 1 was ascertained by X-ray radiocrystallography as well as by NMR spectroscopy and electrospray mass spectrometry. It consists of a macrocycle of nanometric dimension with an external diameter of 28 Å; the central cavity has a diameter of 11 Å, which contains four PF-6 anions as well as solvent molecules. The spontaneous formation of 1 results from a self-assembly process based on a “program” combining two assembly subroutines, each specific to one of the ligand subunits. Self-assembly through double or, more generally, multiple subroutines can be used to generate a wide variety of highly complex inorganic supramolecular architectures by combination of two or more assembly processes.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1421-1428 
    ISSN: 1434-1948
    Schlagwort(e): Grid complexes ; Self-assembly ; Co ; Zn ; Coordination chemistry ; Bis(tridentate) ligands ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The tretrametallic [2 × 2] grid-type complexes 1-4 are formed by self-assembly of the bis(tridentate) ligands 5 and 6 with ZnII and CoII cations. They have been characterized by spectroscopic studies in solution as well as by crystal structure determination. The substituents in the central pyrimidine ring play an important role in terms of geometry and physical properties of the complexes. They induce an orthogonal orientation of the ligand in the complexes which is critical for the formation of ordered monolayers and extended self-organized arrays of grids. The physical properties of the complexes such as metal-metal interaction and π-π* stacking between the ligands may be modulated by changing these substituents.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 4
    ISSN: 1434-193X
    Schlagwort(e): Asymmetric synthesis ; Chiral auxiliaries ; Cycloadditions ; Lanthanides ; δ-Lactones ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: -Chiral aldehydes 4a,b, obtained by the ozonolysis of the corresponding N,N′-fumaroylbis[(S)-proline esters] 3 react in the presence of lanthanoid chelate complexes Eu(fod)3 or Eu(hfc)3 with silyloxydienes 7 or 12 to give δ-lactones 10 or dihydro-γ-pyrones 13 with very high diastereomeric ratios (up to 99:1). The absolute configuration of the predominating diastereoisomer of compound 10b was unequivocally determined by X-ray structural analysis.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 5
    ISSN: 1434-1948
    Schlagwort(e): Silicon ; Phosphorus ; Oligophosphides and -phosphanes ; NMR spectra ; X-ray structure analysis ; Ab initio calculations ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The violet THF adduct (tBu3Si)2P3Na(THF)4 (1a) of the triphosphide (tBu3Si)2P3Na (1) is prepared, (i) by protolysis of the tetraphosphide (tBu3Si)2P4Na2 (2) with an equimolar amount of CF3CO2H in THF (transformation of 2 into 1), (ii) by the reaction of tBu3SiNa and the oligophosphane (tBu3SiP3)n in THF (building-down of Pn), and (iii) by the action of tBu3SiNa on PCl3 in THF (building-up of Pn). According to X-ray structural analysis, the SiPPPSi skeleton of the anionic part [tBu3SiPPPSitBu3]- of 1a is W-shaped with two P-P 11/2 bonds; in addition, 1a contains a planar deltoid P3Na backbone with the 4 THF molecules coordinated to Na. The protolysis of 1a leads to cyclotriphosphane (tBu3Si)2P3H (11), and the oxidation of 1a leads to 1,1′-bicyclotriphosphane (tBu3Si)2P3-P3(SitBu3)2 (12) as the main product and bicyclo[3.1.0]hexaphosphane (tBu3Si)4P6 (13) as an isomer of 12. The structures of 11, 12, and 13 as well as the structure of 1a have been unambiguously determined by 31P-NMR studies. Ab initio structure and energy calculations show that the acyclic P3H2- with allylic conjugation and P-P 11/2 bonds is thermodynamically more stable than the cyclic isomer whereas, in contrast, the neutral compound P3H3 prefers the cyclic form. The exceptional downfield shift of the NMR signal of the central phosphorus in 1a is in agreement with DFT NMR calculations for a model compound [H3SiPPPSiH3]Na with P-P 11/2 bonds.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 517-522 
    ISSN: 1434-1948
    Schlagwort(e): Self-assembly ; Tetranuclear CuII complex ; [2 × 2] grid-type complex ; Crystal structure ; Magnetic properties ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The ditopic ligand 3 has been synthesized. In its deprotonated form, it reacts with copper(II) ions to form a tetranuclear complex 1 of the [2 × 2] CuII4 grid type, the structure of which has been confirmed by X-ray crystallography. Magnetic studies of complex 1 indicate a very weak antiferromagnetic coupling between the phenoxo-bridged CuII ions.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 679-685 
    ISSN: 1434-1948
    Schlagwort(e): Cage compounds ; Metallacyclophanes ; P ligands ; Platinum ; Supramolecular chemistry ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The synthesis of the tris(triflate) 4 (Scheme 1) has been achieved by means of a straightforward three-step reaction sequence. After initial lithiation of mesitylene, treatment of the obtained trilithium compound C6H3(CH2Li)3 (2) with oxirane results in the formation of 1,3,5-tris(3-hydroxypropyl)benzene (3), which is then transformed to 4 by reaction with (CF3SO2)2O in the presence of pyridine. Whereas 4 reacts with Na2[Os(CO)4] in a somewhat complicated manner, similar reactions with Na[Re(CO)5] and LiPPh2 give the hydrocarbon-bridged tris(rhenium) complex C6H3[(CH2)3Re(CO)5]3 (5) and the tris(phosphane) C6H3[(CH2)3PPh2]3 (6), respectively. Employing the high-dilution method, from 6 and Cl2Pt(NCPh)2 the nanoscaled tri- and hexaplatinacyclophanes 7 and 9 are available. Owing to the optimal geometry and flexibility of the cage in 7, 1,2-dichloroethane can be reversibly encapsulated. The molecular structure of 7 · 7 1,2-Cl2C2H4 was determined by an X-ray structure analysis. The utility of the reactive metal centers in 7 has been demonstrated by replacing the chloro ligands by acetonitrile to give the cationic platinacyclophane 8, in which, according to NMR studies, the cage-like structure is preserved.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 471 (1980), S. 140-146 
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Dioxodichlorovanadate [VO2Cl2]-; Preparation, Vibrational Spectrum, and Crystal Structure of [Ph3PMe][VO2Cl2]The title compound was obtained from VO2C1 and [Ph3PMe]Cl in CH2C12 solution in form of orange crystals. Its crystal structure was determined with X-ray diffraction data and was refined to a residual index of R = 5.6% (2124 observed, independent reflexions). [Ph3PMe][VO2Cl2] crystallizes in the rhombic space group P212121 = D24 with four formula units in the unit cell. The low symmetry of the space group causes chirality of the cation. The complex anion is in good aggreement with C2v symmetry; it is isoelectronic with CrO2Cl2. The vibrational spectrum (IR, Raman) was recorded and assigned.
    Notizen: Die Titelverbindung entsteht aus VO2C1 und Triphenylmethylphosphoniumchlorid in Dichlormethan in Form oranger, feuchtigkeitsempfindlicher Kristalle. Die Kristallstruktur wurde mit Hilfe von Röntgenbeugungsdaten aufgeklärt und bis zu einem Übereinstimmungsindex von 5,6% verfeinert (2124 beobachtete unabhängige Reflexe). [Ph3PMe][VO2Cl2] kristallisiert rhombisch (Raumgruppe P212121 = D24) mit vier Formeleinheiten pro Elementarzelle. Die niedrige Symmetrie der Raumgruppe bedingt Chiralität des Kations. Das komplexe Anion [VO2C12]- erfüllt recht gut C2v-Symmetrie; es ist isoelektronisch zu CrO2Cl2. Das Schwingungsspektrum (IR, Raman) wird mitgeteilt und zugeordnet.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 9
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Five-coordinated Complexes of Osmium (VIII) and Rhenium (VII). Crystal Structure of PPh4[OsO4Cl] · CH2Cl2The five-coordinated anionic complexes [OsO4Cl]⊖, [OsO4N3]⊖, and [ReO3Cl2]⊖ were isolated as tetraphenylphosphonium salts from reactions of OsO4 and ReO3Cl with PPh4Cl and PPh4N3, respectively, in dichloromethane solution. The compounds which are characterized by their i.r. spectra, are thermally sensitive and form crystalline powders with colours ranging from orange to violet. The crystal structure of PPh4[OsO4Cl] · CH2Cl2 was determined and refined with X-ray diffraction data. (4212 independent, observed reflexions, R = 0.032). It crystallizes in the monoclinic space group P2/b with four formula units per unit cell. The cell dimensions are at -110°C a = 1754, b = 2184 pm, c = 692 and γ = 106.7°. The structure consists of tetraphenylphosphonium cations and anions [OsO4Cl]⊖ with five-coordinated Os atoms in a trigonal bipyramidal geometry with the chlorine ligand in an axial position. The anion can also be regarded as a OsO4 tetrahedron, monocapped by a chloride ion. Each chloride ion is linked with two CH2Cl2 molecules via hydrogen bridges, forming chains in the direction c. The Os—Cl bond length (276 pm) is very long; the average OsO distance (172 pm) corresponds to that in the OsO4 molecule (170 pm).
    Notizen: Die anionischen Komplexe [OsO4Cl]⊖, [OsO4N3]⊖ und [ReO3Cl2]⊖ mit fünffach koordiniertem Metallatom entstehen in Form ihrer Tetraphenylphosphoniumsalze aus Lösungen von OsO4 bzw. ReO3Cl in Dichlormethan mit PPh4Cl bzw. PPh4N3. Die Verbindungen sind thermisch empfindliche, orangerote bis violette Kristallpulver, die durch ihre IR-Spektren charakterisiert werden. Die Kristallstruktur von PPh4[OsO4Cl] · CH2Cl2 wurde mit Hilfe der Röntgenbeugung aufgeklärt und verfeinert. (4212 unabhängige, beobachtete Reflexe, R = 3,2%). Es kristallisiert in der monoklinen Raumgruppe P2/b mit vier Formeleinheiten pro Elementarzelle. Die Gitterabmessungen sind bei -110°C: a = 1754, b = 2184, c = 692 pm, γ = 106,7°. Die Struktur besteht aus Tetraphenylphosphoniumkationen und [OsO4Cl]⊖-Anionen mit fünffach koordiniertem Os-Atom, in einer verzerrt trigonal-bipyramidalen Anordnung mit Axialstellung des Cl-Liganden. Das Anion läßt sich auch auffassen als ein OsO4-Tetraeder mit einem auf eine Tetraederfläche aufgesetztem Chloridion. Die Chloridionen sind über Wasserstoffbrücken mit je zwei CH2Cl2-Molekülen verbunden unter Ausbildung von Ketten in Richtung c. Der Os—Cl-Bindungsabstand ist mit 276 pm sehr lang, die OsO-Abstände entsprechen mit im Mittel 172 pm etwa denen des OsO4-Moleküls (170 pm).
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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  • 10
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Disulfido-Bridged Halo Complexes of Molybdenum (V). Crystal Sructures of (PPh3Me)2 [Cl4Mo (μ-S2)2MoCl4]. 2 CH2Cl2 and (PPh4)2[Br4Mo(μ-S2)2MoBr4]. 3CH2Br2.Mo(S2)Cl3 is prepared by an improved method; the i.r. spectrum is reported. In dichloro methane solution it reacts with (PPh3Me)Cl forming the complex (PPh3Me)2[Cl4Mo(μ-S2)2MoCl4] · 2 CH2Cl2. The bromo complex (PPh4)2[Br4Mo(μ-S2)2MoBr4] · 3 CH2Br2 is obtained by reaction of MoBr4 with S7NH and subsequent treatment of the reaction mixture with PPh4Br in CH2Br2 solution. Both complexes are characterized by i.r. spectra and structural analyses by X-ray methods.(PPh3Me)2[Cl4Mo(μ-S2)2MoCl4] · 2 CH2Cl2 crystallizes monoclinic in the space group P21/c with two formula units per unit cell (5268 observed independent reflexions, R = 4.0%). The lattice dimensions are: a = 1097 pm, b = 1510 pm, c = 1591 pm, β = 104.4°.(PPh4)2[Br4Mo(μ-S2)2MoBr4] · 3 CH2Br2 crystallizes triclinic in the space group P&1macr; with two formula units per unit cell and the lattice constants a = 1328 pm, b = 1573 pm, c = 1719 pm, α = 95.8°, β = 96.3°, γ = 74.1°.Both compounds are of ionical structure with PPh3Me⊕ and PPh4⊕ cations, respectively, and anions [X4MO(μ-S2)2MoX4]2⊖ very similar to each other. The molybdenum atoms are bridged by two disulfido ligands and are bonded directly with a bond length of 286 pm. The terminal halogen atoms add up to coordination number nine at the molybdenum.
    Notizen: Mo(S2)Cl3, für das eine verbesserte Synthese und das IR-Spektrum angegeben werden, reagiert mit (PPh3Me)Cl in Dichlormethanlösung unter Bildung des Komplexes (PPh3Me)2 [Cl4Mo(μ-S2)2MoCl4]. 2 CH2Cl2. Den Bromokomplex (PPh4)2[BrMo(μ-S2)2MoBr4]. CH2Br2 erhielten wir durch Umsetzung von MoBr4 mit S7NH und anschließender Reaktion des Produktgemisches mit PPh4Br in CH2Br2-Lösung. Beide Komplexe haben wir IR-spektroskopisch und durch röntgenographische Strukturanalysen charakterisiert.(PPh3Me)2[Cl4Mo(μ-S2)2MoCl4].2CH2Cl2kristallisiert monoklin in der Raumgruppe P21/c mit zwei Formeleinheiten pro Elementarzelle (5268 unabhängige, beobachtete Reflexe, R=4,0%). Die Gitterkonstanten sind: a = 1097, b = 1510, c = 1591 pm, β = 104,4°.(PPh4)2[Br4Mo (μ-S2)2MoBr4]. 3CH2Br2 kristallisiert triklin in der Raumgruppe P&1macr; mit zwei Formeleinheiten pro Elementrazelle (4806 unabhängige, beobachtete Reflexe, R = 6.9%). Die Gitterkonstanten sind: a = 1328, b = 1573, c = 1719 pm, α = 95,8°, β = 96,3°, γ = 74,1°.Beide Komplexe haben einen ionischen Aufbau mit PPh3Me⊕ - bzw. PPh4⊕ - Kationen und Anionen [X4Mo(μ-S2)2MoX4]2⊖, die einander sehr ähnlich sind. Die Molybdänatome sind über zwei Disulfidobrücken und durch eine direkte Mo—Mo-Bindung mit einem Abstand von 286 pm miteinander verknüpft. Die terminalen Halogenatome ergänzen die Koordinationszahl am Molybdän zu neun.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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