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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and Single-Crystal X-ray Diffraction Studies on New Methylindium(III) Alkoxides (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1343-1350 
    Details
    ISSN: 1434-1948
    Keywords: Indium ; O ligands ; N ligands ; C ligands ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New heteroleptic indium compounds have been synthesized starting from indium(III) halides and hexamethyldisilazyllithium to form MeXInN(SiMe3)2 [X = Cl (1), Br (2)], and then subsequent alcoholysis to afford the molecules [ClMeIn(OtBu)]2 (3), [BrMeIn(OtBu)]2 (4), {ClMeIn[O(C6H4)OMe]}2 (5), {[(SiMe3)2N]MeIn(OtBu)}2 (6) and [MeIn(OtBu)2]2 (7). The molecular structures of molecules 3-7 have been obtained by single crystal X-ray diffraction studies. The structures of the compounds 3-7 are almost identical: 3-5 crystallize in the monoclinic crystal system with two dimeric molecules per unit cell in the space group P21/c, 6 crystallizes in the monoclinic space group C2/c with four molecules per unit cell, and compound 7 crystallizes in the triclinic crystal system with one dimeric molecule per unit cell in the space group P-1. The central centrosymmetric In2O2 ring, common to all the compounds, is achieved by two bridging oxygen atoms. Due to the additional coordination by an oxygen atom of the methoxy group, the coordination number of the metal center rises from 4 to “4+1” if the OtBu ligand (compounds 3, 4, 6, and 7) is exchanged for a methoxyphenol ligand (compound 5). In addition to the In2O2 ring the compound 5 possesses two annealed five-membered InO2C2 rings. The common indium methyl group of all compounds, which is transfered by an original route from the silicon to the indium atom, is used to compare structural and spectroscopic properties of the molecules, as there is a correlation between the In-C bond length and the chemical shift of the methyl group which depends on the ligand system used.
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and Structures of Alkali(alkoxy) Antimonates and BismuthatesDedicated to Professor Peter Paetzold on the occasion of his 60th birthday. (1995)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 1 (1995), S. 26-32 
    Details
    ISSN: 0947-6539
    Keywords: alkoxides ; clusters ; Group 15 complexes ; Lewis acids ; oxygen bridges ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: As(OtBu)3 does not form adducts with alkali metal tert-butoxides MOtBu (M = Li, Na, K, Rb and Cs), whereas the corresponding Sb(OtBu)3 (2) and Bi(OtBu)3 (3) react with MOtBu (M = K, Rb, Cs) to yield M(OtBu)4Sb (M = K (6), Rb (7), Cs (8)) and M(O-tBu)4Bi (M = 9), respectively. X-ray structure determinations for 6 and 9 show them to be one-dimensional coordination polymers composed of E(OtBu)4 (E = Sb, Bi) units linked through potassium atoms. These E(OtBu)4 units display a ψ-trigonal-bipyramidal coordination around the metal atom (Sb—O = 1.971(2) and 2.181(2) Å, Bi—O = 2.068(8) and 2.275(8) Å). Both the structures exhibit a planar four-coordinate environment of oxygen around the potassium atoms (K—O = 2.650(2)-2.967(2) Å in 6, 2.53(1)-3.15(1) Å in 9). Compound 2 reacts with two equivalents of KOtBu to afford K2Sb(OtBu)5 · dioxane (10), which contains Sb2K2O5 cage units and can be described as an O5 trigonal bipyramid with metal atoms inserted in the equatorial edges. Each metal atom is tetracoordinated by oxygen atoms of the cage (Sb—O = 1.979(3)-2.144(3) Å. K—O = 2.592(3)-2.778(2) Å). The dioxane molecules increase the coordination number at each potassium atom to five by forming bridges between the molecules through K—O bonds. Reaction of 2 and 3 with NaOtBu produce the cluster compounds Na4Sb2O(OtBu)8 (4) and Na4Bi2O-(OtBu)8 (5) in high yields. K4Sb2O-(OtBu)8 (11) is obtained in almost quantitative yield by heating KSb(OtBu)4 in benzene for 24 h. Compounds 4, 5 and 11 crystallise in rhombohedral lattices; the crystal structure analyses show a superposition of molecules. With an isotropic oxygen-centred M6 octahedron. The formation of these oxo-tert-butoxides is accompanied by evolution of isobutene. Addition of four equivalents of THF to 11 gives K4Sb2O(OtBu)8 · 4 THF (12). X-ray diffraction studies reveal a cis arrangement of the Sb atoms in the central OSb2K4 unit. K4Sb2O2(OiPr)12 (13) is obtained as the major product on heating KSb(OtBu)4 and subsequent reaction with isopropyl alcohol. In the crystal structure, two oxygen-centred Sb2K2 tetrahedra (K—O 2.693(4) Å, Sb—O = 1.982(5) Å) linked through iPrO—K bonds (2.726(7)-2.738(7) Å) are observed. In the reactions of KSb(OtBu)4 (6) with the metal halides CaCl2, TlCl and CuI, a halide ion is transferred to potassium; this results in formation of potassium halide, the corresponding alkoxide and Sb(OtBu)3.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19950010108
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  • 3
    Electronic Resource
    Electronic Resource
    Über Derivate des Hydrazins, 2 Darstellung und einige Eigenschaften vierfach substituierter Hydrazine (Me3E)2N - N(EMe3)2 (E=C, Si, Ge, Sn) (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3176-3190 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Derivatives of Hydrazine, 2 Preparation and some Properties of Tetrasubstituted Hydrazines (Me3E)2N - N(EMe3)2 (E = C, Si, Ge, Sn)Reaction of hydrazine, N2H4, with chlorides Me3ECl (E = C, Si, Ge, Sn) or amines Me3SiNMe2 and reaction of hydrazides (Me3E)mN2HnLip (m+n+p = 4) with Me3ECl yield easily sublimable, high melting and melting and thermally stable hydrazines (Me3E′)(Me3E″)N - N(E‴Me3)-(E‴′Me3) with similar (E = E′ = E″ = E‴ = E‴′) and different ligands Me3E (for example: E′ = C, E″ = Si, E‴ = Ge, E‴′ = Sn). Only hydrazines with trimethylstannyl groups are easily solvolized and oxidized.
    Notes: Durch Reaktion von Hydrazin, N2H4, mit Chloriden Me3ECl (E = C, Si, Ge, Sn) sowie Aminen Me3SiNMe2 bzw. durch Reaktion von Hydraziden (Me3E)mN2HnLip (m+n+p = 4) mit Me3ECl konnten gleichartig substituierte (E = E′ = E″ = E‴ = E‴′) sowie gemischt substituierte Hydrazine (Me3E′)(Me3E″)N - N(E‴Me3) (E‴′Me3) (z. B. E′ = C, E″ = Si, E‴ = Ge, E‴′ = Sn) als leicht sublimierbare, hochschmelzende und thermisch sehr stabile Verbindungen gewonnen werden. Nur die trimethylstannylgruppen-haltigen Hydrazine solvolysieren leicht und werden von Oxydationsmitteln rasch angegriffen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711041023
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  • 4
    Electronic Resource
    Electronic Resource
    Cyclische Diazastannylene, V. Synthese und Struktur einer neuartigen Käfigverbindung mit einem SiN2Sn2O-Gerüst (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 2536-2546 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic Diazastannylenes, V. Synthesis and Structure of a New Cage Compound with a SiN2Sn2O SkeletonThe cage compound 1,5-di-tert-butyl-6,6-dimethyl-3-oxa-1,5-diazonia-6-sila-2λ2,4λ2-distannatotricyclo[2.2.0.02,5]hexane (5) originates as an SnCl2 adduct from controlled hydrolysis of a mixture of 1,3-di-tert-butyl-2,2-dimethyl-1,3,2,4λ2-diazasilastannetidine (1) and 1,3-di-tert-butyl-4,4-dichloro-2,2-dimethyl-1,3,2,4λ4-diazasilastannetidine (2). Crystal data and the molecular structure have been obtained by X-ray methods (table 1; R = 0.035). The structure is dominated by an SnCl2 band, to which the cage units are connected via the oxygen atom acting as an electron donor (Sn—O: 2.07 Å). The cage can be understood as a regular N2Sn2 tetrahedron (Sn—N: 2.31 Å) bridged by a dimethylsilyl group (Si—N: 1.76 Å) across the N—N edge and by an oxygen atom across the opposite Sn—Sn edge (Sn—O: 2.09 Å). An alternative description would be that of a twisted six-ring D bridged across the 1,4- and 2,5-positions. All tin atoms in the structure conform to the stannate(II) geometry.
    Notes: Die Käfigverbindung 1,5-Di-tert-butyl-6,6-dimethyl-3-oxa-1,5-diazonia-6-sila-2λ2,4λ2-distannatotricyclo[2.2.0.02,5]hexan (5) entsteht als SnCl2-Addukt bei vorsichtiger Hydrolyse eines Gemisches aus 1,3-Di-tert-butyl-2,2-dimethyl-1,3,2,4λ2-diazasilastannetidin (1) und 1,3-Di-tert-butyl-4,4-dichlor-2,2-dimethyl-1,3,2,4λ4-diazasilastannetidin (2). Die Kristalldaten sowie die Molekülstruktur wurden mit röntgenographischen Methoden erhalten (Tab. 1; R = 0.035). Die Struktur baut sich aus einem SnCl2-Band auf, an das die Käfigmoleküle über den Sauerstoff als Elektronendonor gebunden sind (Sn—O: 2.07 Å). Der Käfig kann als N2Sn2-Tetraeder beschrieben werden (Sn—N: 2.31 Å), dessen gegenüberliegende N—N- und Sn—Sn-Kanten jeweils mit Dimethylsilyl (Si-N: 1.76 Å) bzw. Sauerstoff (Sn—O: 2.09 Å) überbrückt sind. Eine alternative Beschreibung wäre ein Sechsring in der „twist“-Konformation D, der in 1,4- und 2,5-Position nochmals verbunden ist. Alle in der Struktur vorkommenden Zinnatome erreichen eine Stannat(II)-Geometrie.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110709
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  • 5
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    Electronic Resource
    Über Derivate des Hydrazins, 3 Darstellung und Oxydation silylierter, germylierter sowie stannylierter Hydrazine und Organylhydrazine (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3191-3203 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Derivatives of Hydrazine, 3 Preparation and Oxidation of Silylated, Germylated, and Stannylated Hydrazines and OrganylhydrazinesOxidation of silyl- or germyl-substituted (trimethylstannyl)-organylhydrazines [for example (Me3Sn)RN - N(EMe3)(SnMe3); R = Me, CMe3, Ph; E = Si, Ge] with p-benzoquinone (or, less advantageously, with oxygen) affords silyl- and germyl-substituted diimines R-N=N-EMe3 in high yields. Stannyl-substituted organyldiimines (E = Sn) could not be prepared in this way. Methods for the preparation of the substituted organylhydrazines used for the oxidation reactions are reported.
    Notes: Durch Oxydation silylierter bzw. germylierter Trimethylstannyl-organyl-hydrazine, z.B. des Typs (Me3Sn)RN - N(EMe3)(SnMe3) (R = Me, CMe3, Ph; E = Si, Ge), mit p-Benzochinon (bzw. weniger vorteilhaft mit Sauerstoff) entstehen in hohen Ausbeuten silylierte und germylierte Organyldiimine R - N=N - EMe3. Stannylierte Organyldiimine (E = Sn) können auf diesem Reaktionsweg nicht gewonnen werden. Über die Darstellung der für die Oxydation benötigten substituierten Organylhydrazine wird berichtet.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711041024
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  • 6
    Electronic Resource
    Electronic Resource
    Cyclische Diazastannylene, VI. Darstellung und Charakterisierung des tetrameren tert-Butyl-iminostannylens und verwandter Käfige (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2581-2587 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic Diazastannylenes, VI. Preparation and Properties of Tetrameric tert-Butyliminostannylene and Related Cages1,3-Di-tert-butyl-2,2-dimethyl-1,3,2,4λ2-diazasilastannetidine (1) undergoes quantitative cleavage with tert-butylamine at 50°C in benzoic solution. According to the molar ratios of tert-butylamine and 1 the aminolysis products are the tricyclic cage Me2Si(NCMe3)2Sn2(NCMe3) (4) or the seco-norcubane-like molecule Sn3(NCMe3)4H2 (5) plus N,N′-di-tert-butyl-Si,Si-dimethylsilazane (3). 5 can be converted to the complete “cubane” Sn4(NCMe3)4 (6) quite easily. The structures of the compounds can be determined from high resolution 1H NMR and mass spectral data.
    Notes: 1,3-Di-tert-butyl-2,2-dimethyl-1,3,2,4λ2-diazasilastannetidin (1) wird bei 50°C in Benzol quantitativ durch tert-Butylamin gespalten. Als Aminolyseprodukte entstehen je nach Molverhältnis von tert-Butylamin zu 1 neben N,N-Di-tert-butyl-Si,Si-dimethylsilazan (3) ein tricyclischer Käfig Me2Si(NCMe3)2Sn2(NCMe3) (4) oder ein seco-norcubanartiges Molekül Sn3 (NCMe3)4H2 (5). Letzteres läßt sich leicht in das volle “Cuban” Sn4(NCMe3)4 (6) umwandeln. Die Konstitutionen der Verbindungen können aus hochaufgelösten 1H-NMR- und Massenspektren bestimmt werden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120726
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  • 7
    Electronic Resource
    Electronic Resource
    Cyclische Diazastannylene, XIII. [SnN2(CH3)2]4 und [SnNCH(CH3)2]4, Moleküle mit Cuban-Struktur (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 2141-2152 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic Diazastannylenes, XIII. [SnN2(CH3)2]4 and [SnNCH(CH3)2]4, Molecules with Cubane-like Structures1,3-Di-tert-butyl-2,2-dimethyl-1,3,2,4λ2-diazasilastannetidine (1) reacts in benzene with N,N-dimethylhydrazine spontanously and with isopropylamine after warming shortly to yield N,N′-di-tert-butyl-Si,Si-dimethylsilazane (2) and the tetrameric molecules (SnN2Me2)4 (5) and (SnNCHMe2)4 (6). An X-ray structure determination (R = 0.026) proves 5 to be built of a very distorted Sn4N4-cube, the nitrogen atoms being attached to dimethylamino groups. In the crystal the molecules are linked together by Sn—Sn contacts (351 pm) forming a zick-zack band, which runs in the direction of the hexagonal axis. Typical Sn—N bond lengths are found to be 220.9 and 225.1 pm, while the mean N—N distance is 146.2 pm. When heated or by contact with oxygen the crystals of 5 decompose vehemently: the products are found to be β-tin, molecular nitrogen, and varying amounts of methane, ethane, and dimethylamine (by contact with oxygen small amounts of tin(II)-oxide are formed as well).
    Notes: 1,3-Di-tert-butyl-2,2-dimethyl-1,3,2,4λ2-diazasilastannetidin (1) reagiert in Benzol mit N,N-Dimethylhydrazin spontan und mit Isopropylamin nach kurzem Erwärmen zu N,N′-Di-tert-butyl-Si,Si-dimethylsilazan (2) und den Tetrameren (SnN2Me2)4 (5) und (SnNCHMe2)4 (6). Eine Röntgenstrukturbestimmung (R = 0.026) zeigt, daß 5 einen stark verzerrten Sn4N4-Kubus besitzt, an dessen Stickstoffatome Dimethylaminogruppen gebunden sind. Im Kristall sind die Moleküle über Sn—Sn-Kontakte (351 pm) zu einem Zickzack-Band verknüpft, das in Richtung der hexagonalen Achse verläuft. Typische Sn—N-Bindungslängen liegen bei 220.9 und 225.1 pm, während für N—N 146.2 pm ermittelt werden. Beim Erhitzen sowie bei Sauerstoffzufuhr zersetzen sich die Kristalle von 5 heftig: als Produkte erhält man β-Zinn, molekularen Stickstoff und in wechselnden Mengen Methan, Ethan und Dimethylamin (bei Sauerstoffeinwirkung auch geringe Mengen an Zinn(II)-oxid).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150611
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  • 8
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    Electronic Resource
    Stickstoffverbindungen von Elementen der dritten Hauptgruppe mit intra- und intermolekularen Donor-Akzeptor-Bindungen. I. Synthesen (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1600-1615 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Nitrogen Compounds of Elements of Main Group III with Intra- and Intermolecular Donor-Acceptor Bonds. - 1. SynthesesThe hydrogen atoms in N, N′-di-tert-butyl-Si,Si-dimethylsilanediamine (8) can be substituted by main group III elements, to which organic groups (methyl, phenyl) or chlorine atoms are bound. The resulting molecules combine atoms, which are electron acceptors (Group III elements) or electron donors (nitrogen atoms) and thus may cause additional bonds. In detail the following systems have been prepared by different methods: (a) diazasilaelementetidines Me2Si(NtBu)2- El—X (X = Me, El = Al (2b), In (2d); X = Ph, El = Al (2e)), which are dimerized by inter-molecular coordination, (b) the diazasilaaluminetidine Me2Si(NtBu)2Al(Me) · NC5H5 (3, which is stabilized at the aluminium atom by pyridine, (c) disubstituted N,N′-di-tert-butyl-Si,Si- dimethylsilanediamines X2El-N(tBu)-SiMe2- N(tBu)-ElX2 (X = Me, El = (4b), Ga(4c), in (4d); X = Cl, El = Al (4e)), (d) monosubstituted N,N′—di—tert—butyl—Si,Si—dimethylsilanediamines X2El—N(tBu)—SiMe2—N(tBu)—H (X = Me, El = B (5a), Al (5b), Ga (5c), In (5d), Tl (5e); X = Cl, El = B (5f), Al (5g), Ga (5h), In (5i)), and (e) related compounds of the formula tBu - O- SiMe2- N(tBu)-ElX2 (X = Me, El = Al (6a); X = Cl, El = Ga (6b)).
    Notes: Die Wasserstoffatome im N, N′-Di-tert-butyl-Si,Si-dimethylsilandiamin (8) können durch Elemente der dritten Hauptgruppe, die organische Reste (Methyl, Phenyl) oder Chloratome als weitere Liganden tragen, substituiert werden. In den entstehenden Molekülen sind Atome vereinigt, die als Elektronenakzeptoren (Elemente der dritten Hauptgruppe) und als Elektronendonoren (Stickstoffatome) zusätzliche Bindungen untereinander eingehen können. Im einzelnen wurden nach unterschiedlichen Methoden synthetisiert: (a) Diazasilaelementetidine Me2Si(NtBu)2El—X (X = Me, El = Al (2b), In (2d); X = Ph, El = Al (2e)), die allesamt als Koordinationsdimere vorliegen, (b) das durch Koordination von Pyridin am Aluminiumatom stabilisierte Diazasila-aluminetidin Me2Si(NtBu)2Al(Me) · NC5H5 (3), (c) disubstituierte N,N′-Di-tert-butyl-Si,Si-dimethylsilandiamine des Typs X2El-N(tBu)-SiMe2-N(tBu)-ElX2 (X = Me, El = Al (4b), Ga (4c), In (4d); X = Cl, El = Al (4e)), (d) einfach substituierte N,N′-Di-tert-butyl-Si,Si- dimethylsilandiamine des Typs X2El- N(tBu)-SiMe2- N(tBu)- H(X = Me, El = B (5a), Al (5b), Ga (5c), In (5d), Tl (5e); X = Cl, El = B (5f), Al (5g), Ga (5h), In (5i)) und (e) hierzu verwandte Verbindungen der allgemeinen Formel tBu — O — SiMe2— N(tBu)— ElX2 (X = Me, El = Al (6a); X = Cl, El = Ga (6b)).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180427
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  • 9
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    Electronic Resource
    Tuning Metal Stoichiometry in Heterometal Alkoxides: First Structurally Characterised Molecular Precursor to BaZrO3 (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 1327-1332 
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    ISSN: 1434-1948
    Keywords: Barium ; Zirconium ; O ligand ; Heterometal alkoxides ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Manipulable metal ratios are accessible in a series of heterometal Ba-Zr alkoxides by changing the size and the charge of the ligands. The synthesis and characterisation of four mixed-metal Ba-Zr species [BaZr2(OtBu)10] (1), [Ba2Zr(OtBu)8(tBuOH)(THF)2] (2), [BaZr(OtBu)6(THF)2] (3) and [BaZr(OH)(OiPr)5(iPrOH)3]2 (4), based on different Ba/Zr stoichiometries, are reported. The molecular structures of 1, 2, and 4 have been determined by single-crystal X-ray diffraction studies. 1 exhibits a bow-tie structural motif in which a trigonally distorted six-coordinate barium atom is chelated by two bipyramidal {Zr(OtBu)5}- units. 2 reveals a triangular “Ba2Zr(μ3-OtBu)2(μ2-OtBu)3” core structure formed by the fusion of three octahedra built about two Ba atoms and a Zr atom. The structure is unique in terms of the distribution of terminal ligands at each of the metal centers. One of the barium atoms possesses one -OtBu and one tBuOH as terminal ligands, while the terminal ligands on the second barium atom are two THF molecules; the zirconium center bears -OtBu groups as the terminal ligands. Hydrolysis of compound 3 with one equivalent of water, followed by alcoholysis (iPrOH) of the resulting product, gave 4. The structure of 4 shows a planar tetrametallic Ba2Zr2 frame capped by two μ3-hydroxo ligands. The coordination figure of the zirconium atoms resembles a distorted octahedron, whereas the geometry of the barium centers is best described as capped trigonal prisms. Both 3 and 4 are excellent precursors to morphologically pure BaZrO3 ceramic by the sol-gel process.
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  • 10
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    Synthese und Struktur von Digerma- und DistannacyclobutenenCyclische Diazastannylene, 29. Mitteilung. - 28. Mitteilung: M. Veith, V. Huch, R. Lisowsky, P. Hobein, Z. Anorg. Allg. Chem., im Druck. (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 101 (1989), S. 640-642 
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    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19891010526
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