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2001[X]
81Author    Alfonso Castiñeiras, Ricardo Domínguez3, Leandro Bresolinb, Jairo Bordinhãob, João Adaílton, Manfredo Bortoluzzib, HörnerbRequires cookie*
 Title    Synthesis and Crystal Structure of a Novel Polymeric Lead(II) Complex with Thiosemicarbazonato and Thiocyanate Ligands  
 Abstract    Lead(II) Complex, 2-Acetylpyridine-4N-methylthiosemicarbazone A novel heptacoordinated thiosemicarbazonato lead(II) complex [Pb(4ML)(SCN)] (4ML = 2-Acetylpyridine-4N-methylthiosemicarbazonato) was synthesized and characterized by conventional methods (IR and elemental analysis) and single-crystal X-ray diffraction. [Pb(4ML)(SCN)J shows an unusual polymeric structure in which the lead atom is hexa-co-ordinate, the deprotonated thiosemicarbazone both chelates and bridges, and the thiocyanate group acts as bridge between lead(II)-thiosemicarbazonate fragments. There is hydrogen-bond­ ing between the polymeric chains. The complex crystallizes in the triclinic space group P i with a = 7.461(2), b = 9.572(2), c = 11.235(2) A, a = 66.51(3), ß = 84.01(3), 7 = 68.75(3)°, V = 685.1(2) A3, Z = 2. 
  Reference    Z. Naturforsch. 56b, 517—520 (2001); received January 8 2001 
  Published    2001 
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 Identifier    ZNB-2001-56b-0517 
 Volume    56 
82Author    Maciej Bujak, Jacek ZaleskiRequires cookie*
 Title    Dependence of the Distortion of the Square Pyramids in A^jV-Dimethylethylenediammonium Pentachloroantimonate(III) on the Geometry of Hydrogen Bonds  
 Abstract    12, 2001 /V,/V-Dimethylethylenediammonium Cation, Chloroantimonate(III) /V,/V-Dimethylethylenediammonium pentachloroantimonate(III) crystallizes in the mono­ clinic system, in space group P2i/c (a = 12.460(2), b = 10.252(2), c = 10.330(2) A, ß = 97.75(3)°, V = 1307.5(4) Ä3, Z = 4, dc = 1.997, dm = 1.99(2) g/cm3). The crys­ tal structure of [(CH3)2NH(CH2)2NH3][SbCl5j consists of isolated [SbCls]2 anions and [(CH3)2NH(CH2)2NH3r cations. The [SbCls] anion has a distorted square pyramidal ge­ ometry, presenting one short axial and four long equatorial Sb-Cl bonds. The square pyramids are characteristically stacked one close to the other, parallel to the c axis. The voids between the anionic sublattice are filled by [(CH3)2NH(CH2)2NH3]2+ cations. The five non-equivalent Sb-Cl bond distances within the [SbCls]2-square pyramid are significantly different. The equatorial Sb-Cl bonds are in the range 2.427(2)-2.968(2) Ä, whereas the axial one is 2.384(1) A long. The study reveals that N-H...C1 hydrogen bonds are responsible for the deformation of equa­ torial Sb-Cl bonds from the mean value of 2.654(7) A. Analysis of intermolecular interactions between the [SbCls]2-pyramids in the structure, reflected in changes of Sb-Cl bond lengths from the values characteristic of non-interacting pyramids, leads to the conclusion that the van der Waals radius of Sb is significantly smaller than that estimated by Pauling. 
  Reference    Z. Naturforsch. 56b, 521—525 (2001); received March 
  Published    2001 
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 Identifier    ZNB-2001-56b-0521 
 Volume    56 
83Author    Csaba Som, P. Éter, H. Egyesb, E. Rt Fenyö3, G. Ab, O., K. Tó Th, Otond Penke3, W. Olfgang, V. OeltercRequires cookie*
 Title    Synthesis and Solid-Phase Application of a 9-Xanthenyl Handle  
 Abstract    Polymer Support, Solid-Phase Synthesis, Xanthene The acid-labile 5-[(9-aminoxanthen-2-yl)oxy]valeric acid was prepared in a six-step route. The usefulness of the resulting handle was investigated with solid-phase peptide synthesis of cholecystokinin-8 sulfate and the phosphorylated receptor complex 138-144. 
  Reference    Z. Naturforsch. 56b, 526—532 (2001); received November 2 2000 
  Published    2001 
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 Identifier    ZNB-2001-56b-0526 
 Volume    56 
84Author    Requires cookie*
 Title    or-Dicarbonylmonophenylhydrazone als Nucleophile und Nachbargruppen  
 Abstract    a-D icarbonylm onophenylhydrazones as N ucleophiles and N eighbouring G roups H ans M öhrle und G eorg K eller Institut für Pharm azeutische C hem ie, H ein rich -H ein e-U n iversität, U niversitätsstr. 1, D -40225 D ü sseldorf, G erm any 
  Reference    Z. Naturforsch. 56b, 533 (2001) 
  Published    2001 
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 Identifier    ZNB-2001-56b-0533 
 Volume    56 
85Author    Requires cookie*
 Title    Synthese und Eigenschaften von «-Aminocarbohydroximsäure-estern  
 Abstract    Synthesis and P ro p erties of a-A m inocarbohydroxim ic E sters W olfgang T him ann und D etlef G effken Institut für Pharm azie, A b teilu n g für Pharm azeutische C h em ie, U n iversität H am burg, B un desstraß e 45, D -20146 H am burg 
  Reference    Z. Naturforsch. 56b, 547 (2001) 
  Published    2001 
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 Identifier    ZNB-2001-56b-0547 
 Volume    56 
86Author    Z. NaturforschRequires cookie*
 Title    A New Synthesis of Two Naturally Occurring Dihydrobenzo[6]furan-Type Neolignans of Potential Biological Activity  
 Abstract    L ászló Ju h á sz3, Z o ltán D in y a3, Sán dor A n tu s3, and Tam ás E. G u n d ab A new synthesis of the racemates of two naturally occurring neolignans 1 and 2 was achieved via the 2,3-dihydrobenzo[£>]furan derivative 3, starting from the commercially avail­ able materials o-vanillin (6) and acetovanillone (9). 
  Reference    Z. Naturforsch. 56b, 554—559 (2001); received May 31 2000 
  Published    2001 
  Keywords    Benzofurans, Neolignan, Heck Reaction 
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 Identifier    ZNB-2001-56b-0554 
 Volume    56 
87Author    Harald Dialer, Kurt Polbom, W. Olfgang BeckRequires cookie*
 Title    Radikal-markierte Metallocene (M = Fe, Co). Metallocenylen verbrückte Bis(3-imidazolin-l-oxyle)  
 Abstract    Radical Labeled M etallocenes (M = Fe, Co). M etallocenylene B ridged B is(3-im idazolin-l-oxyls) The addition of the lithium salt of the silyl protected hydroxylamine 1-hydroxy-2,2,4,5,5-pentamethyl-3-imidazoline (1) to 6 ,6 -dimethylfulvalene gives the lithium cyclopentadienide 2 from which the 1,1 '-substituted ferrocene and cobaltocinium derivatives 3 and 4 were obtained. Deprotection and oxidation of 3 and 4 afford the metallocenylene bridged bis(3-imidazolin-l-oxyls) 5 and 7. The ferrocene bridged diradical 5 forms with DDQ a charge transfer complex 8 . The complexes 5 and 7 were characterized by X-ray diffraction and by their EPR spectra. Magnetic measurements show at room temperature two independent spins for 5 and 7 and four unpaired electrons for 8 , the latter arising from three different sources [Fe(III) low spin d5, two nitroxides and DDQ-radical anion]. 
  Reference    Z. Naturforsch. 56b, 563 (2001); 8 1 3 7 7 München eingegangen am 8. März 2001 
  Published    2001 
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 Identifier    ZNB-2001-56b-0563 
 Volume    56 
88Author    H. P. FritzRequires cookie*
 Title    Ab initio Calculations and Qualitative Valence Bond Considerations for H2N -N 02 (Nitramide) and H2N-NO (Nitrosamine)  
 Abstract    The structures, energies and vibrational frequencies of H2 N-NO2 and H2 N-NO have been calculated at HF, MP2(FC), MP2(FULL) and CISD levels of theory using a polarized triple-zeta 6-311+G(d,p) basis augmented with a diffuse function. In addition, the structures and energies were also computed at the QCISD(T)/6-311+G(d,p) level of theory. The structure and bonding in H2 N-NO2 and H2 N-NO is discussed on the basis of a Natural Bond Orbital Analysis (NBO analysis) and in addition based on qualitative valence bond (VB) considerations. 
  Reference    Z. Naturforsch. 56b, 571—575 (2001); received March 14 2001 
  Published    2001 
  Keywords    Nitramide, Nitrosamine, Valence Bond Structures 
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 Identifier    ZNB-2001-56b-0571 
 Volume    56 
89Author    Requires cookie*
 Title    Synthese und Struktur des Kalium-tetrakis(triisopropylsilylphosphanyl)indats  
  Reference    Z. Naturforsch. 56b, 576 (2001) 
  Published    2001 
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 Identifier    ZNB-2001-56b-0576 
 Volume    56 
90Author    Sellm Ann, N.Icole Blum, FrankW. Heinem, H. P. FritzRequires cookie*
 Title    D ieter  
 Abstract    Iron Sulphur Complexes, Nitrogenase The reactions of [Fe('pyS4 ')l2 with PMe3 , P«Pr3 , N2 H4 and pyridine afforded mononuclear [Fe(L)('pyS4 ')] complexes with L = PMe3 (1), PnPr3 (2), N2 H4 (3) and pyridine (4). NMR spectroscopy, magnetic measurements and X-ray structure determinations revealed that all complexes exhibit frans-thiolate donors and low-spin Fe11 centres, irrespective of the a-ir or a ligand character of L. In this regard, the properties of [Fe(L)('pyS4 ')] complexes strongly contrast with those of [Fe(L)('NHS4 ')] complexes ('NhS4 i2~ = 2 ,2 '-bis(2 -mercaptophenylthio)-diethylamine(2 -)) and indicate that the rigid py(CH2) 2 entity of the 'pyS4 ,2~ ligand is able to enforce trans configurations and low-spin states of complexes with [FeNS4 ] cores. In spite of their diamagnetism, confirming the absence of antibonding electrons, all complexes 1 to 4 are highly reactive and rapidly exchange their L ligands for CO to give [Fe(CO)('pyS4 ')]. Evidence was obtained that the oxidation of [Fe(N'-H4)('pyS4 ')] (3) yields the diazene complex [/x-N2 H2 {Fe('pyS4 ')}2 ] (5). 
  Reference    Z. Naturforsch. 56b, 581—588 (2001); received April 6 2001 
  Published    2001 
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 Identifier    ZNB-2001-56b-0581 
 Volume    56 
91Author    H. P. FritzRequires cookie*
 Title    The Stannides RE R hSn (RE = Ho -Yb) and ScTSn (T = Pd, Pt) -Structure Refinements and 119Sn Mössbauer Spectroscopy  
 Abstract    The stannides RERhSn (RE = Ho -Yb) and ScTSn (T = Pd, Pt) were prepared by reaction of the elements in sealed tantalum tubes in a high-frequency furnace, by arc-melting, or by a tin-flux technique in quartz tubes. The rhodium based stannides crystallize with the ZrNiAl type structure, space group P62m. The four structures were refined from single crystal X-ray data: a = 754.5(3), c = 377.1(1) pm, wR2 = 0.0357, 233 F 2 values for HoRhSn, a = 753.3(1), c = 372.16(8) pm, wR2 = 0.0721, 233 F 2 values for ErRhSn, a = 753.7(3), c = 369.0(2) pm, wR2 = 0.0671,233 F 2 values for TmRhSn, and a = 753.17(5), c = 366.53(4) pm, wR2 = 0.0566, 180 F 2 values for YbRhSn with 14 parameters for each refinement. ScPdSn and ScPtSn adopt the HfRhSn type, a superstructure of ZrNiAl, space group P62c: a = 747.5(1), c = 710.2(1) pm, for ScPdSn, and a = 738.37(9), c = 729.47(9) pm, wR2 = 0.0452,369 F 2 values, 18 variables for ScPtSn. Structural motifs in these stannides are transition metal centered trigonal prisms formed by the rare earth and tin atoms. While these prisms are regular in the rhodium based stannides, significant distortions occur in ScPdSn and ScPtSn. The formation of the superstructure can be ascribed to packing reasons. The shortest interatomic distances occur between the transition metal (T) and tin atoms. These atoms form three-dimensional [FSn] networks in which the rare earth atoms fill distorted hexagonal channels. The series RERhSn displays a somewhat unique behavior. The a lattice parameter is more or less independent of the rare earth element, while the c lattice parameter shows the expected lanthanoid contraction. ll9Sn Mössbauer spectroscopic data of the rhodium stannides show signals at isomer shifts varying from 1.77 to 1.82 mm/s subject to quadrupole splitting between 0.75 to 0.82 mm/s. 
  Reference    Z. Naturforsch. 56b, 589—597 (2001); received April 12 2001 
  Published    2001 
  Keywords    Stannides, Crystal Structure, Mössbauer Spectroscopy 
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 Identifier    ZNB-2001-56b-0589 
 Volume    56 
92Author    Thom As Fickenscher, G. Unter Kotzyba, Rolf-D Ieter, H. Offm, Ann, R. Ainer Pöttgen, H. P. FritzRequires cookie*
 Title    Synthesis, Structure, and Magnetic Properties of EuAgCd and YbAgCd  
 Abstract    New intermetallic compounds EuAgCd and YbAgCd were synthesized in quantitative yield by reaction of the elements in sealed tantalum tubes in a high-frequency furnace. Both com­ pounds were investigated by X-ray diffraction on powders and single crystals: KHg2 type, Imma, a = 490.41(8), b = 771.0(1), c = 834.4(2) pm, wR2 = 0.0624, 255 F values, 12 variables for EuAgCd, and MgZn2 type, Pb^/mmc, a = 584.66(5), c = 946.83(9) pm, wR2 = 0.0502, 187 F 2 values, 11 variables for YbAgCd. Owing to the very small difference in scattering power, no long range ordering of the silver and cadmium atoms is evident from the X-ray data, although Ag-Cd ordering is expected. The silver and cadmium atoms randomly occupy the mercury and zinc positions of the KHg2 and MgZn2 type structures, respectively. In EuAgCd the [AgCd] substructure consists of strongly puckered, orthorhombically distorted Ag3 Cd3 hexagons, while a three-dimensional network of face-and comer-sharing tetrahedra is observed in YbAgCd. The rare earth atoms fill the space between the Ag3 Cd3 hexagons (EuAgCd) or within the three-dimensional tetrahedral network (YbAgCd). Magnetic susceptibility measurements in­ dicate Pauli paramagnetism for YbAgCd and Curie-Weiss behavior above 60 K for EuAgCd with an experimental magnetic moment of 7.82(3) /j b/Eu indicating divalent ytterbium and europium. Ferromagnetic ordering at Tc = 28.0(5) K is observed for EuAgCd. At 2 K and 5 T the saturation magnetization is 5.85(5) /iß/Eu. 
  Reference    Z. Naturforsch. 56b, 598—603 (2001); received April 12 2001 
  Published    2001 
  Keywords    Cadmium, Crystal Structure, Magnetic Properties 
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 Identifier    ZNB-2001-56b-0598 
 Volume    56 
93Author    P. Eter Höhn, Rüdiger Km, H. P. FritzRequires cookie*
 Title    Ba16Nb5N19 -A Nitridoniobate(V) Containing Isolated [NbN4]7' and [Nb2N7]11-Units  
 Abstract    Nitridometalate, Nitridoniobate Bai6 NbsNi9 was synthesized by reaction of Ba with Nb under nitrogen at ambient pressure at 1223 K. The refined crystal structure was solved in the space group P I (no. 2), Z = 2, with the lattice constants a = 1099.33(3), b = 1140.41(15), c = 1622.06(6) pm, a = 72.197(2)°, ß = 59.949(1)°, 7 = 82.243(2)° and R\ = 0.058, wR2 = 0.088. The crystal structure contains both isolated [NbN4]7_ as well as dimeric units [Nb2N7 ]" ~ . Together with the Ba2+ ions the compound has to be regarded as Bai6 [NbN4 ]3 [Nb2 N7 ]. 
  Reference    Z. Naturforsch. 56b, 604—610 (2001); received April 18 2001 
  Published    2001 
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 Identifier    ZNB-2001-56b-0604 
 Volume    56 
94Author    Jan Ellermeier, Wolfgang Bensch, H. P. FritzRequires cookie*
 Title    Solvothermal Syntheses, Crystal Structures and Properties of Thiomolybdates with Complex Transition Metal Cations  
 Abstract    Thiomolybdates, Solvothermal Synthesis The new compounds Ni2(tren)3(Mo202Sö)2 • 2.75 H2O (I) and Co2(tren)3(MoS4)2 (II) (tren = tris(2-aminoethyl)amine) were prepared under solvothermal conditions. The structure of I is built up of one-dimensional [Ni2(tren)3]4+ chains and isolated [M02O2S6]2-anions. Each Ni atom in the cationic chain is surrounded by six N-atoms to form a distorted octahedron. The connection of the Ni-atoms in the [Ni2(tren)3]4+ -units with the tren molecules leads to zigzag chains in the (100) plane. The situation is different for compound II which consists of isolated [Co2(tren)3]4+ cations and discrete tetrahedral [M0S4]2-anions. The Co atom in the cation is in a distorted trigonal bipyramidal environment of four N atoms of one tren molecule and of one N atom from a bridging tren-molecule, building up the dimeric structure of the [Co2(tren)3]4+ unit. Between the anions and cations of both compounds hydrogen bonding is observed. The thermal behaviour of I and II was investigated using differential thermoanalysis and thermogravimetry. On heating I first looses the crystal water and then decomposes slowly in one step, whereas II decomposes also in one step, but at a significantly lower temperature. 
  Reference    Z. Naturforsch. 56b, 611—619 (2001); received April 20 2001 
  Published    2001 
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 Identifier    ZNB-2001-56b-0611 
 Volume    56 
95Author    Christian Kranenberg, Dirk Johrendt, Albrecht Mewis, Winfried Kockelmanna, Herrn Professor, DrH P FritzRequires cookie*
 Title    Kristall-und elektronische Struktur von LaAlSi2 Crystal and Electronic Structure of LaAlSi2  
 Abstract    Silicides, Lanthanum, Aluminium LaAlSi2 (a = 4.196(2), c = 11.437(7) Ä; P3ml; Z = 2) was synthesized by arc-melting of preheated mixtures of the elements. The compound was investigated by means of X-ray methods and by neutron diffraction. The crystal structure can be described as a stacking variant of two different segments. The first one corresponds to the CaAl2Si2 structure type (LaAl2Si2), the second one with the A1B2 structure type (LaSi2). The segments are stacked along [001]. The electronic structure of the compound is discussed on the basis of LMTO band structure calculations. 
  Reference    Z. Naturforsch. 56b, 620—625 (2001); eingegangen am 3. Mai 2001 
  Published    2001 
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 Identifier    ZNB-2001-56b-0620 
 Volume    56 
96Author    Norbert Kuhna, Stefan Fuchs3, Rolf Minkwitzb, Thorsten Berendsb, Herrn Professor, DrH P FritzRequires cookie*
 Title    Collidinium-und Imidazolium-Salze Fluor-haltiger Anionen  
 Abstract    Die Kristall­ struktur von [CollH]2 [AsF6][As2 Fu ] (Coli = 2,4,6-Trimethylpyridin) Collidinium and Imidazolium Salts of Fluorine-Containing Anions. The Crystal Structure of [CollH]2[AsF6][As2Fl l ] (Coll = 2,4,6-Trimethylpyridine) From s-Collidine (1, Coll) and aqueous HF compounds of the composition Coll • n HF (n = 1 -2) are formed which are transformed to [CollH]+ [HF2]~ (2) by sublimation. [CollH]2[AsF6][As2F] J (3) is obtained from 1 and the superacid system HF/AsF5. 2 reacts with 2,3-dihydro-l,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (4, Im) to give the imidazo­ lium salt [ImH]+ [HF2]~ (5). Hydrogen bonds in the crystal structure of [CollH]2[AsF6][As2Fn ] (3) are discussed. 
  Reference    Z. Naturforsch. 56b, 626—629 (2001); eingegangen am 3. Mai 2001 
  Published    2001 
  Keywords    Hydrogen Fluoride, Imidazoles, Pyridines 
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 Identifier    ZNB-2001-56b-0626 
 Volume    56 
97Author    NorbertW. Mitzel, Udo Losehand, H P FritzRequires cookie*
 Title    Hexakis(dimethylaminoxy)disiloxane: Insertion of an Oxygen Atom into the Si-Si Bond of a Disilane by Dimethylaminoxy Lithium Dedicated to Professor Dr  
 Abstract    Silicon, Disilane, Siloxane The compound (Me2NO)3SiOSi(ONMe2)3 was prepared by the reaction of LiONMe2 with Si2Cl6, a reaction in which oxygen is inserted into the Si-Si bond. The crystal structure of (Me2NO)3SiOSi(ONMe2)3 was determined and shows the compound to have a linear siloxane core and SiON units with small valence angles at oxygen, caused by weak Si (-N interactions leading to partially hypercoordinate Si centres. 
  Reference    Z. Naturforsch. 56b, 630—633 (2001); received May 18 2001 
  Published    2001 
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 Identifier    ZNB-2001-56b-0630 
 Volume    56 
98Author    SupersilyltrielanesR., N., E. =. Triel, R., Sirbu3, Nils Wiberg, Kerstin Amelunxen, Thomas Blank, Hans-Wolfram Lerner, Kurt Polborn, Heinrich Nöth, Ralf Littger, Manfred Rackl, Martin Schmidt-Amelunxen, Holger Schwenk-Kircher, Markus Warchold, Herrn Professor, DrH P Fritz, R. *. Ehal2, D., R. *. Ehal2, R., =. Sirbu3, Al, GaRequires cookie*
 Title    Supersilyltrielane R*wEHal3 _M (E = Triel, R* = Si/Bu3): Synthesen, Charakterisierung, Reaktionen, Strukturen [1]  
 Abstract    = OR2, NR3) have been synthesized by reaction of EHal3 with NaR* in the absence or presence of donors as well as by substitution of D, Hal or R* by other substituents, or by reaction of R*2E-ER*2 (E = Al, In) with I2, H2, AgF2 or HBr. Thermal decomposition of the compounds in solution or in the gas phase leads to elimination of D from R*EHal2»D, or of R'Hal from R*EHal2 and R*2EHal, respectively. The dihalides R*EHal2 act as Lewis acids with respect to donors OR2 or NR3 (formation of adducts R*EHal2*D), the monohalides R*2EHal as Lewis bases with respect to acceptors EHal3 (formation of R*2E+ EHal4~). Dehalogenations of R*2EHal and R*EHal2 with alkali metals or NaR* leads to compounds R*4Ei (E = AI, In, Tl), R*3E2* (E = AI, Ga), R~4E3* (E = Al, Ga), R*4E4 (E = AI, Ga), R*6Ga8, R%In12, (R*2B"), R*2A P , R*3Ga2~, R*4Ga3~, R*4Ga42~, R*4T13C1, or R*6T16C12. The structures of R*BBr2*Py, R*AlBr2»NEtMe2, (R*A1C10Bu)2, R*2BF as well as R*2EC1 (E = B, Al, Ga, Tl) have been determined by X-ray structure analyses. 
  Reference    Z. Naturforsch. 56b, 634—651 (2001); eingegangen am 2. Mai 2001 
  Published    2001 
  Keywords    ): Syntheses, Characterization, Reactions, Structures [1] Silicon, Trieles, Supersilyl Water-and oxygen-sensitive compounds, In, TI, Hal = F, Cl, Br, I, D 
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 Identifier    ZNB-2001-56b-0634 
 Volume    56 
99Author    ^., E. =. Al, Nils Wiberg, Thomas Blank, Hans-Wolfram Lemer, Heinrich Nöth, Tassilo Habereder, Dieter Fenske, Herrn Professor, DrH P FritzRequires cookie*
 Title    Silyltrielane  
 Abstract    , Ga, In; R' = Si/Bu2Ph): Synthesen, Charakterisierung, Strukturen [1] Silyltrielanes R',;EHal3_" (E = Al, Ga, In; R' = Si/Bu2Ph): Syntheses, Characterization, Structures [1] Silicon, Aluminium, Gallium Water-and oxygen-sensitive compounds of the type R'"EHal3_" (R' = Si/Bu2Ph; E = Triel) with or without donors, viz. R'3In have been synthesized by reaction of EX3 with NaSifBu2Ph (prepared for this purpose) in the absence or presence of donors. The dihalides R'EHal2 have also been obtained by reaction of R'3E with EHal3, whereas monohalides R'2EHal are not accessible via these and other routes up to date. All trielanes have been characterized by NMR and the structures of the R'3E compounds have been determined by X-ray analyses. 
  Reference    Z. Naturforsch. 56b, 652—658 (2001); eingegangen am 2. Mai 2001 
  Published    2001 
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 Identifier    ZNB-2001-56b-0652 
 Volume    56 
100Author    Barbara Böck, Heinrich Nöth, Ulrich Wietelmann, H. P. FritzRequires cookie*
 Title    Reactions of Amino-imino-boranes with Transition Metal Halides and Substituted Transition Metal Halides  
 Abstract    Adducts of Aminoimino Boranes, Metallated Diaminoboranes, Titanium The aminoiminoborane tmp-B=NCMe3 (1) adds to TiBr4 or ZrCL in a 1:1 ratio while PdCh adds 1 in a 1:2 ratio. In these new compounds the NBN unit is almost linear and the configuration corresponds to an allene. On the other hand 1 and Ti(OR)4 compounds and Ti(NMe2)4 give N metallated diaminoboranes tmp-B(X)-NCMe3EX3 (X = OR, NMe2). Mixed compounds Ti(OR)3_"X" lead to diaminoboranes with BOR groups while the TiCl bond inserts into the B =N bond of 1 to produce tmp-BNMe2-NCMe3TiCl3. Hydrolysis of this compound leads to a spirocyclic dititanoxane with a short linear Ti-O-Ti bond and pentacoordinated Ti centers carrying two Cl atoms each. Spirocycles with a BN2E (E = Ti, Nb, Ta, Pd) unit are formed when 1 is allowed to react with TiCU, NbCls, TaCls and PdCh. The palladium compound 16 is dimeric, and dimerization occurs via Pd-Cl bridges. The aminoiminoborane tmp-B=NC6H3-2,6-/Pr2 reacts with the titanium compounds in the same manner as 1, however without formation of spirocycles. 
  Reference    Z. Naturforsch. 56b, 659—670 (2001); received May 3 2001 
  Published    2001 
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 Identifier    ZNB-2001-56b-0659 
 Volume    56 
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