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1999 (64)
1Author    Z. NaturforschRequires cookie*
 Title    Pentacoordinated Nitrogen Atoms in the Structure of Hexalithium Bis[methylsilyl-tris(methylimide)] Hexakis(tetrahydrofuran)  
 Abstract    Lithiation of tris(methylamino)wt'f/7v/silane using an excess of n -butyllithium affords the cor­ responding trifunctional lithium amide in high yield. The compound crystallizes from tetrahy-drofuran as a dimer with six donor molecules: {[M eSi(NM eLi)3]2(thf)6}. The cluster is a cage structure grouped around a crystallographic center of inversion. The silicon and lithium atoms are tetrahedrally tetracoordinated, but the nitrogen atoms are pentacoordinated and have a square pyramidal environment of one carbon, one silicon, and three lithium atoms. Parallels can be drawn to other species with polymetallated nitrogen functions. An analogous compound was prepared from tris(methylamino)vwv/silane. 
  Reference    (Z. Naturforsch. 54b, 8—12 [1999]; received September 1 1998) 
  Published    1999 
  Keywords    Silylamines, Silylamides, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0008.pdf 
 Identifier    ZNB-1999-54b-0008 
 Volume    54 
2Author    Joachim Pethe, Joachim SträhleRequires cookie*
 Title    Synthese und Kristallstruktur von [Au(AuNCO)(AuPPh3)8]Cl Synthesis and Crystal Structure of [Au(AuNCO)(AuPPh3)8]Cl  
 Abstract    The photolysis of Cr(CO)6 and Ph3PAuN3 (1:2) in thf yields the unstable cluster cation [(Ph3PAu)5Cr(CO)4]+ that slowly decomposes to form the new homometallic gold cluster [Au(AuNCO)(AuPPh3)8]Cl. The cluster compound crystallizes in form of red needles in the tetragonal space group 14 with a = 2214.1(3), c = 1408.9(2) pm, and Z = 2. The inner skeleton of the cluster with the symmetry C4 consists of a centered square antiprism of nine Au atoms with the square faces of the antiprism being bridged by the AuNCO group, and a C P anion, respectively. The shortest Au-Au distances exist between the central and the 8+1 peripheral Au atoms ranging between 263.5(1) and 270.6(3) pm, the four Au-Cl distances are 280(1) pm. 
  Reference    Z. Naturforsch. 54b, 381—384 (1999); eingegangen am 3.Dezember 1998 
  Published    1999 
  Keywords    Gold Cluster, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0381.pdf 
 Identifier    ZNB-1999-54b-0381 
 Volume    54 
3Author    M. Ludwig3, R. Niewab, R. KniepRequires cookie*
 Title    Dimers [A12N6]12-and Chains J j A lN ^ ] in the Crystal Structures of Ca6[Al2N6] and Ba3[Al2N4]  
 Abstract    Pale yellow transparent single crystals of Ca6[Al2Nö] (P 2\/c, No. 14, a = 693.7(3), b = 614.9(3), c = 987.1(5) pm, ß = 94.01(5)°; Z = 4) and colourless transparent single crystals of Ba.^ALN*] (Pnna, No. 52, a = 617.9(2), b = 1005.2(4), c = 1023.0(4) pm; Z = 4) were obtained from reactions of mixtures of the representative metals with nitrogen at Tmax = 1000 °C. The crystal structure of CaöfALNft] contains isolated units [ALNftJ12-built of two edge-sharing tetrahedra. Ba3[ALN4] is an isotype of S r^A bN ^. The crystal structure contains infinite chains ^ [A1N^T2] of trans edge-sharing tetrahedra. 
  Reference    Z. Naturforsch. 54b, 461—465 (1999); received December 18 1998 
  Published    1999 
  Keywords    Nitridoaluminates, Preparation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0461.pdf 
 Identifier    ZNB-1999-54b-0461 
 Volume    54 
4Author    MarkusF. Zumdick, Rainer PöttgenRequires cookie*
 Title    Condensed [Ru4Sn6] Units in the Stannides LnRu4Sn6 (Ln = La, Pr, Nd, Sm, Gd) -Synthesis, Structure, and Chemical Bonding  
 Abstract    The stannides LnRu4Sn6 (Ln = La, Pr, Nd, Sm, Gd) were prepared by reaction of the elements in an arc-melting furnace and subsequent annealing at 1120 K. The praseodymium, the neodymium, and the samarium stannide were obtained for the first time. The LnRu4Sn6 stannides were investigated by X-ray diffraction both on powders and single crystals. They adopt the YRu4Sn6 type structure which was refined from single crystal X-ray data for the samarium and the gadolinium compound: /42m, a = 686.1 (1), c = 977.7(2) pm, wR2 = 0.0649, 483 F2 values for SmRu4Sn6, and a = 685.2(1), c = 977.6(3) pm, wR2 = 0.0629, 554 F2 values for GdRu4Sn6 with 19 variables for each refinement. The striking structural motif of these stannides are distorted RuSnö octahedra with Ru-Sn distances ranging from 257 to 278 pm. Four of such octahedra are condensed via common edges and faces forming [Ru4Snö] units which are packed in a tetragonal body-centered arrangement. The rare-earth atoms fill the voids between the [Ru4Sn6] units. Based on an extended Hückel calculation, strong bonding interactions were found for the Ru-Sn and the various Sn-Sn contacts. 
  Reference    Z. Naturforsch. 54b, 863—869 (1999); received March 29 1999 
  Published    1999 
  Keywords    Stannides, Crystal Structure, Chemical Bonding 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0863.pdf 
 Identifier    ZNB-1999-54b-0863 
 Volume    54 
5Author    Rolf Minkwitz, Michael Berkei, Sonderdruckanforderungen An, ProfR. Dr, MinkwitzRequires cookie*
 Title    Neuuntersuchung der Kristallstruktur von a-ICl Novel Investigation on the Crystal Structure of a-ICl  
 Abstract    The redetermination of the crystal structure of a-iodine monochloride, a-ICl, is described. It cry­ stallises monoclinically in the space group P2j/c with a = 1216.2(1), b = 428.6(1), c = 1188.9(1) pm, ß= 117.50(1)° and eight formula units per unit cell. 
  Reference    Z. Naturforsch. 54b, 1615—1617 (1999); eingegangen am 10. September 1999 
  Published    1999 
  Keywords    Iodine Monochloride, Redetermination, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1615_n.pdf 
 Identifier    ZNB-1999-54b-1615_n 
 Volume    54 
6Author    Z. NaturforschRequires cookie*
 Title    The Stereochemistry of Chloro-bis(N-morpholino)phenylsilane  
 Abstract    Treatment of phenyltrichlorosilane with an excess of morpholine and N-lithium-morpholide in pentane/toluene affords only the disubstitution product Cl(Ph)Si(M or)2 with Mor = 0 (C H 2C H :)2N-. The third halogen atom is not replaced owing to sterical hindrance. The title compound crystallizes with two independent molecules in the unit cell. These two molecules can be classified as enantiomers, because a disrotatory twist of the two morpholino ligands away from the potential mirror plane induces a chiral conformation. In benzene solution there is racemization owing to completely free rotation, chair/boat interconversion, and nitrogen inversion of the morpholino groups on the NMR time scale, but all CH 2 protons remain anisochronous (diastereotopic). 
  Reference    (Z. Naturforsch. 54b, 18—20 [1999]; received October 15 1998) 
  Published    1999 
  Keywords    Silylamines, Aminosilanes, Symmetry, NMR Data, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0018.pdf 
 Identifier    ZNB-1999-54b-0018 
 Volume    54 
7Author    Z. NaturforschRequires cookie*
 Title    SrRhIn2, SrPdIn2, Srlrln2, and SrPtIn2 -New Intermetallic Compounds with a Filled Variant of the Caln2 Structure  
 Abstract    SrR hlm , SrPdIn2, Srlrln2, and SrPtIn2 have been synthesized by reaction of mixtures of the elements in glassy carbon crucibles in a high-frequency furnace. The new compounds were investigated by X-ray diffraction on powders as well as single crystals; a = 437.3(2), b = 1091.9(5), c = 798.0(2) pm for SrRhln^, a = 453.54(7), b = 1079.8(2), c = 790.4(1) pm for SrPdIn2, a = 434.83(8),b= 1102.6(2) ,c = 798.6(2) pm for Srlrln2, a = 447.5(1) , b = 1091.0(3), c = 787.6(1) pm for SrPtIn2. They adopt the MgCuAl2 structure, a ternary ordered version of Re^B. Chemical bonding analysis leads to the description of a filled S rln2 structure in which the In-in-bonding is modified by the insertion of transition metal atoms into the planar strontium layers, thus favoring strong indium-transition metal 
  Reference    (Z. Naturforsch. 54b, 38—44 [1999]; received August 28 1998) 
  Published    1999 
  Keywords    Intermetallic Compounds, Crystal Structure, Chemical Bonding 
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 Identifier    ZNB-1999-54b-0038 
 Volume    54 
8Author    MarkusF. Zum, R. Olf-D, Hoffm Ieter, Rainer Ann, PöttgenRequires cookie*
 Title    The Intermetallic Zirconium Compounds ZrNiAl, ZrRhSn, and ZrPtGa -Structural Distortions and Metal-Metal Bonding in Fe2P Related Compounds  
 Abstract    ZrNiAl, ZrPtGa, and ZrRhSn have been prepared by reacting the elements in an arc-melting furnace and subsequent annealing at 970 K. These compounds have previously been investigated only by use of X-ray powder data for ZrPtGa and ZrRhSn and single crystal film data for ZrNiAl. Precise single crystal diffractometer data are reported in the present paper. The structure of ZrNiAl is confirmed. It adopts a substitution variant of the FeiP type: P62m, a = 691.5(2), c = 346.6(1) pm, Z = 3, wR2 = 0.0538, 320 F2 values, 14 parameters. The structure refinement reveals a large displacement parameter U 33 for one nickel position, indicative of a slight nickel dislocation. Weak superstructure reflections could be found on Guinier powder patterns for ZrPtGa and ZrRhSn. These compounds crystallize with the HfRhSn type structure (Z = 6 , space group P62c), a superstructure of the Fe2P type: a = 714.5(1), c = 706.3(2) pm, w/?2 = 0.0651, 594 F2 values, 18 parameters for ZrPtGa and a = 734.2(2), c = 721.8(2) pm, wR2 = 0.0349, 355 F2 values, 18 parameters for ZrRhSn. Structural motifs of these compounds are transition metal centered trigonal prisms formed by the zirconium, aluminium, gallium, and tin atoms. While these trigonal prisms are regular in ZrNiAl, significant distortions occur in the structures of ZrPtGa and ZrRhSn. Due to the distortions of the trigonal prisms in the superstructures, some platinum and rhodium atoms are dislocated from the subcell mirror planes towards Pt-Pt and Rh-Rh pairs with distances o f 310 and 313 pm, respectively. The formation of the superstructure is most likely due to packing reasons. Chemical bonding in ZrRhSn was investigated on the basis of an extended Hückel calculation. 
  Reference    (Z. Naturforsch. 54b, 45—53 [1999]; received August 20 1998) 
  Published    1999 
  Keywords    Intermetallic Compounds, Crystal Structure, Superstructure, Chemical Bonding 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0045.pdf 
 Identifier    ZNB-1999-54b-0045 
 Volume    54 
9Author    Z. NaturforschRequires cookie*
 Title    U ntersuchungen an Polyhalogeniden, X X X IX  
 Abstract    [1] [(H 30)(1 8 -K r o n e -6)]I7, eine Struktur-Neubestim m ung Studies on Polyhalides, X X X IX [1] S tructure R efinem ent of [(H 30)(1 8 -cro w n -6)]I7 Sawsan A bd El K halika, M ervat El Essaw ia, Ingo D om brow skih, K arl-Friedrich T ebbeb * The structure analysis of the compound [(H30)(18-Krone-6)]I7 has been repeated. The al­ ready known structure could now be described with improved precision. The unique polyiodide chain i [ (I _'2I2) I2] may be derived from the regu­ lar three dimensional iodide-iodine lattice c»[U 3I2] by separation. 
  Reference    Z. Naturforsch. 54b, 136—139 (1999); eingegangen am 6. Oktober 1998 
  Published    1999 
  Keywords    Polyhalogenide, Heptaiodide, Crown Ether, Oxonium Compound, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0136_n.pdf 
 Identifier    ZNB-1999-54b-0136_n 
 Volume    54 
10Author    Rainer Mattes, Ulrich VoetRequires cookie*
 Title    Komplexe zweier vierzehngliedriger Tetraazadibenzo-Makrocyclen. Strukturen eines freien Liganden und von Nickel(II)-, Kupfer(II)-und Zink(II)-Komplexen Complexes o f Two 14-Membered N4 Dibenzo Macrocycles. Crystal Structures o f a Free Ligand and o f Nickel(II), Copper(II) and Zinc(II) Complexes  
 Abstract    The syntheses and structural characterizations of complexes of two 14-membered macrocy­ clic trans-N4 dibenzo ligands, 5,7,8,9,14,16,17,18-octahydrodibenzo[e,l]-[l,4,8,l ll-tetraaza-cyclotetradecine-6,15-dimethyl (L3) resp. -6,15-diacetamide (L4), are presented. The crystal structures of five compounds have been determined by single crystal X-ray diffraction. The free ligand L3 has a saddle-shaped structure with intramolecular hydrogen bonds. This conformation of the ligand exists also in the Zn(II) complex in which the metal ion is five-coordinated with the metal center outside the cavity. The coordination polyhedron is intermediate between a trigonal bipyramid and a square pyramid. In c/5-[Ni(L3)(NCS)2] the ligand is folded along an N- • N axis. The nickel ion in this complex shows an approximate octahedral geometry. For Ni(II) and Cu(II) complexes of ligand L the overall geometry is also distorted octahedral. The folding of the ligand causes a d s-N 40 2 coordination. 
  Reference    Z. Naturforsch. 54b, 321—328 (1999); eingegangen am 6. Oktober 1998 
  Published    1999 
  Keywords    Macrocyclic N4-Donor Ligands, Transition Metal Complexes, Crystal Structure 
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 Identifier    ZNB-1999-54b-0321 
 Volume    54 
11Author    Andreas Komath, Oliver BlecherRequires cookie*
 Title    Kristallstruktur und thermische Phasenumwandlung von Tetramethylammoniumcyanid, (Ct^^N+CN- Crystal Structure and Thermal Phase Transition of Tetramethylammonium Cyanide, (CH3)4N+CN~  
 Abstract    Tetramethylammonium cyanide crystallizes in the tetragonal space group P4/nmm, Z = 2, with cell dimensions a = 773.6(1), c = 546.8(1) pm. The cyanide ion is disordered in the plane perpendicular to the c-axis indicating a rotation. The room temperature phase undergoes a thermal phase transition at -59.9°C probably caused by an order-disorder transition of the cyanide ion. 
  Reference    Z. Naturforsch. 54b, 372—376 (1999); eingegangen am 3. November 1998 
  Published    1999 
  Keywords    Cyanides, Crystal Structure, Thermal Phase Transition 
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 Identifier    ZNB-1999-54b-0372 
 Volume    54 
12Author    JuliaA. Rusanova3, PhilipJ. Squattritob, KonstantinV. Domasevitcha, Volodimirn KokozayaRequires cookie*
 Title    Structure of a Cs(18-crown-6)N(CN)2*H20 Complex: Assembly of the Dimeric 2:2 Anion Paired Encapsulate by Means of jz2-Bridging Water Molecules  
 Abstract    The new macrocyclic complex of composition Cs(18-crown-6)N(CN)2-H20 has been pre­ 
  Reference    Z. Naturforsch. 54b, 389—393 (1999); received October 23 1998 
  Published    1999 
  Keywords    18-Crown-6, Caesium Macrocyclic Complexes, Dicyanamide, Crystal Structure 
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 Identifier    ZNB-1999-54b-0389 
 Volume    54 
13Author    B. Wedelb, K. Sugiyama3, K. Hiraga3, K. ItagakibRequires cookie*
 Title    Zur Kristallchemie des ersten Blei-Zink-Silicium-Telluroxids: PbZn4SiTeOio On the Crystal Chemistry o f the First Lead Zinc Silicon Tellurium Oxyde PbZn4SiTeO 10  
 Abstract    Single crystals of the new lead zinc silicon tellurium oxide PbZn4SiTeO10 have been prepared by solid state reaction in air. The compound is colourless and crystallizes in orthorhombic symmetryj space group Dih Pnma, with the cell parameters: a = 6.542 (5), b = 15.624(4), c = 8.280(4) A, Z = 4. The structure has been determined from a single crystal X-ray study and refined to the conventional values R = 0.032 and wR(F2) = 0.050. Zn~+ and Si4+ show tetrahedral and Te6+ octahedral coordination by 0 2~.The crystal structure is dominated by a ^ [Zn4O l0]12-framework with isolated Te066+ and Si044+ polyhedra. Pb2+ ions are incorporated in the network. The centres of negative charge of the lone of the Coulomb term of the lattice energy. 
  Reference    Z. Naturforsch. 54b, 469—472 (1999); eingegangen am 3. Dezember 1998 
  Published    1999 
  Keywords    Lead, Zinc, Silicon, Tellurium, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0469.pdf 
 Identifier    ZNB-1999-54b-0469 
 Volume    54 
14Author    Markus Häp, TheoG. Illes, Thomas Kruck, Karl-Friedrich TebbeRequires cookie*
 Title    Dichloro  
 Abstract    [bis(775-2,4-cyclopentadien-l-yl)aIkylphosphan]zirconium: PR(C5H4)2 ZrCl2 ; R = Me, Et, 'Pr, 'Bu Dichloro[bis(/7r'-2 ,4 -cyclopentadien-l-yl)alkylphosphine]zirconium: PR(C5H4)7ZrCL; R = Me, Et, 'Pr, ?Bu A series of new ansa-zirconocene dichloride compounds [PR(C5H4)2ZrCl2: R = Me (5), Et (6), 'Pr (7), ?Bu (8)] with phosphorus as bridging atom between the cyclopentadienyl rings have been prepared, isolated, and characterised by 'H, i3C, 31P NMR spectroscopy, mass spectrometry and elemental analysis. The X-ray structure of 5 is reported. 
  Reference    Z. Naturforsch. 54b, 482—486 (1999); eingegangen am 22. Dezember 1998 
  Published    1999 
  Keywords    Zirconium Ansa-Metallocene, Cyclopentadienyl, Phosphine, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0482.pdf 
 Identifier    ZNB-1999-54b-0482 
 Volume    54 
15Author    MikeR. Kopp, Thomas Kräuter, Anahita Dashti-Mommertz, Bernhard NeumüllerRequires cookie*
 Title    Organogallitimamide: Synthese und Kristallstrukturen von [IPr2GaN(H/Bu]2 und [Mes(Cl)GaN(H)'Bu]2 Organogallium Amides: Synthesis and Crystal Structures o f ['Pr-,GaN(H)'Bu]-, and [Mes(Cl)GaN(H)'Bu]2  
 Abstract    ['Pr2GaN(H)'Bu]2 (1) and [Mes(Cl)GaN(H)'Bu]2 (2) can be synthesized by the metathesis reaction of 'Pr2GaCl and MesGaCl2 with one equivalent of LiN(H)'Bu, respectively. 1 and 2 were characterized by NMR, IR and MS techniques as well as by X-ray structure analyses. 1 and 2 consist of centrosymmetric dimeric molecules with a G a2N2 skeleton. According to cryoscopic measurements in benzene, both amides 
  Reference    Z. Naturforsch. 54b, 627—631 (1999); eingegangen am 8. Januar 1999 
  Published    1999 
  Keywords    Gallium Compounds, Organogallium Amides, Crystal Structure 
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 Identifier    ZNB-1999-54b-0627 
 Volume    54 
16Author    Steffen Runge3, MathiasO. Senge3, Karin Ruhlandt-SengebRequires cookie*
 Title    5,10,15,20-Tetrakis(diphenylmethyl)porphyrin -A Nonplanar Porphyrin with Intermediate Degree of Ruffling  
 Abstract    The title compound was prepared by condensation of pyrrole and diphenylacetaldehyde in 16% yield. Based on spectroscopic data, the free base porphyrin exhibits a nonplanar macrocycle in solution with a degree of distortion between that of 5,10,15,20-tetracyclohexyl-porphyrin and 5,10,15,20-tetra(r-butyl)porphyrin. A crystal structure determination of the cobalt(II) complex reveals a ruffled macrocycle conformation with an average out-of-plane displacement of the m eso carbon atoms by 0.55 A. 
  Reference    Z. Naturforsch. 54b, 662 (1999); received February 17 1999 
  Published    1999 
  Keywords    Porphyrins, Steric Strain, Cobalt Porphyrins, Crystal Structure, Conformation 
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 Identifier    ZNB-1999-54b-0662 
 Volume    54 
17Author    Axel Lifferth3, IsabelB. Ahnera, Ut Helm, Lackner, M. Artina SchäferbRequires cookie*
 Title    Synthese und Struktur von Prolinring-modifizierten Actinomycinen des X-Typs Synthesis and Structure of Proline Ring Modified Actinomycins of the X-Type  
 Abstract    The first total synthesis o f actinomycins containing L-4-hydroxyproline (1) and the separa­ tion and NM R spectroscopic assignment o f the regioisomers X (V* and iso-X0/i (lc, le) are described. The synthetic X 0/j proves, that the oxidized proline ring of the natural actinomycins 
  Reference    Z. Naturforsch. 54b, 681—6 (1999); eingegangen am 15. Januar 1999 
  Published    1999 
  Keywords    Antibiotics, Actinomycins, Synthesis, Crystal Structure, NM R Data 
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 Identifier    ZNB-1999-54b-0681 
 Volume    54 
18Author    Joachim Pickardt, Pirka WischlinskiRequires cookie*
 Title    Kristallstruktur des "supramolekularen" Komplexes [K(Benzo-18-krone-6)][Zn(CN)3]*H20 mit einem polymeren kettenförmigen Tricyanozincat-Anion Crystal Structure of the "Supramolecular" Complex [K(benzo-18-crown-6)][Zn(CN)3] *H20 with a Polymeric Tricyano Zincate Anion with Chain Structure  
 Abstract    Crystals o f the com plex [K (benzo-18-crown-6][Zn(CN)3] H20 were obtained from a solution o f Z n(C N)2, KCN, and b en zo-18-crown-6 in water/methanol. The compound crystallizes in the triclinic space group PI (no. 2),: Z = 2, a = 818,6(5), b = 1236,7(8), c = 1359,6(6) pm, a = 67,02(4), ß = 87,38(4), 7 = 75,46(5). Each Zn atom is bonded to one bridging cyanide ion to give chains -Z n (C N)Z n -, and to two terminal CN groups. The N atom o f one o f the terminal CN groups interacts with a potassium ion o f the [K (benzo-18-crow n-6)]+ unit. The coordination spheres o f the K ions are completed by water molecules, which in turn form hydrogen bonds to N atoms o f terminal CN groups o f neighbouring chains, whereby puckered sheets are formed. 
  Reference    Z. Naturforsch. 54b, 747 (1999); eingegangen am 10. Februar 1999 
  Published    1999 
  Keywords    Zinc Cyanide C om plex, Crown Ether Complex, Crystal Structure 
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 Identifier    ZNB-1999-54b-0747 
 Volume    54 
19Author    Petra Prokop, Rainer Richter, Lothar BeyerRequires cookie*
 Title    Zur Reaktion von 2,4-Dioxo-4-ferrocenyl-butansäureethylester mit primären aromatischen Aminen On the Reaction of Ethyl 2,4-Dioxo-4-ferrocenyl-butanoate with Primary Aromatic Amines  
 Abstract    Starting from ethyl 2,4-dioxo-4-ferrocenyl-butanoate (1) a series of new ferrocene derivatives has been prepared. While the reaction with o-phenylene diamine leads to two ferrocene-con­ taining heterocyclic compounds, 4-ferrocenyl-3//-l,5-benzodiazepine-2-carbonic acid ethyl ester (3) and 3-(2-ferrocenyl-2-oxo-ethylidene)-3,4-dihydro-l//-quinoxalin-2-one • H20 (4), reactions with m-and /?-phenylene diamine give both the mono-and disubstituted products 5 -8, respectively. The conversion of 4 by Lawesson's reagent results in 2-ferrocenvl-thieno[2,3-b]quinoxaline (9). The new compounds have been characterized by their 'H , 1 C NMR, and mass spectra. The molecular structures of 4-ferrocenyl-4-oxo-2-phenylamino-but-2-enoic acid ethyl ester 2, and of 4 and 9 have been determined by X-ray crystal structure analysis. 
  Reference    Z. Naturforsch. 54b, 849—857 (1999); eingegangen am 12. März 1999 
  Published    1999 
  Keywords    Ferrocene, /3-Diketones, Enaminoketones, NMR Data, Crystal Structure 
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 Identifier    ZNB-1999-54b-0849 
 Volume    54 
20Author    Max Herberhold, Silke Köppl, Wolfgang MiliusRequires cookie*
 Title    Mixed-Sandwich rflry Vanadium Complexes. The Molecular Structure of (?75-2-Methyl-indenyl)-(777-cycloheptatrienyl)-vanadium  
 Abstract    The diamagnetic halfsandwich complexes [V(?^7-C7H7)(CO)3] and [V(7/5-L5)(CO)4] have been used as intermediates in the conversion of hexcarbonylvanadium, V(CO)6, to the para­ magnetic trovacene derivatives, [V(775-L5)(r77-C7H7)] [L^ = cyclopentadienyl ligand, C5H4-R (R = H (1), Me (la), 'Bu (lb)) and CsMes (lc); indenyl (2) and 2-methylindenyl (2a)]. The molecular structure of 2a has been determined: the distances between vanadium and the center Z of the (nearly parallel) ring ligands are 193.0 pm 
  Reference    Z. Naturforsch. 54b, 899—903 (1999); received April 8 1999 
  Published    1999 
  Keywords    Sandwich Compounds, Cycloheptatrienyl Complexes, Vanadium, Crystal Structure 
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 Identifier    ZNB-1999-54b-0899 
 Volume    54 
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