Go toArchive
Browse byFacets
Bookbag ( 0 )
'X Ray' in keywords
Results  269 Items
Sorted by   
Publication Year
2001 (1)
1998 (1)
1997 (14)
1996 (17)
1995 (17)
1994 (17)
1993 (13)
1992 (16)
1991 (11)
1990 (3)
141Author    Wolfgang Flossmann, Herbert Zehner, Adolf MüllerRequires cookie*
 Title    Radicals Produced in Single Crystals of Thymine Derivatives by UV and X-Rays  
 Abstract    Single crystals o f anhydrous thym ine (T), thym ine monohydrate (T ■ H 20) , 5,6-dihydrothym ine (T H 2), 1-methylthymine (mT) and thym idine (dT) were irradiated with X-rays and UV between 77 K and 300 K. Six types o f radicals were analyzed by ESR-spectroscopy at 9.5 G H z and 35 G H z after exposure to X-rays. The anion radical occurred only in T • H 20 at 77 K, the 4-yl radical only in T H 2 at 77 K and the 1-yl radical only in T between 77 K and 300 K. The 6 -yl radical was found in T, T H 2 and mT. It was converted into the 5-yl radical irreversibly by heat or white light (A < 600 nm). The 5-yl radical appeared in all compounds at room temperature. The highest thermal stability was found for the 7-yl radical which was present at room temperature in all compounds except T H 2 . U V -irradiation (A = 320 nm) produced radicals only in three crystals (T, T H 2 , dT). In T the 5-yl radical was found after exposure at 300 K, and two other radicals, 1-yl and 7-yl, at 77 K. A lso at 77 K, the 7-yl radical was present in dT and the 5-yl radical in TH 2 and dT. 
  Reference    Z. Naturforsch. 35c, 20—2 (1980); received July 23 1979 
  Published    1980 
  Keywords    Radicals, Single Crystals, Thym ine, X-Rays, ESR 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0020.pdf 
 Identifier    ZNC-1980-35c-0020 
 Volume    35 
142Author    Alfred Gieren, Michail KokkinidisRequires cookie*
 Title    Structure Investigations o f Agonists o f the Natural Neurotransmitter Acetylcholine II [1| X-ray Structure Analysis o f Trimethyl(4-oxopentyl)ammonium-chloride  
 Abstract    The crystal structure of Trimethyl(4-oxopentyl)ammonium-chloride ([(C H 3) 3 N —(CH^aCOCHjJCl-) (1) was determined by an X-ray structure analysis. 1 crystallizes in the orthorhombic space group P21 21 21 with a = 10.440 (3), b = 14.600 (9), c = 6.804 (9) A and with four formula units per unit cell. The structure was solved by a Patterson and a successive Fourier synthesis. The least squares refinement yielded an R-value o f 0.064 for 1077 observed reflections. The cation o f 1 is derived from acetylcholine by replacement o f the ester oxygen with a CH2 group. It shows a potent nicotinic activity and a significant difference in conformation as compared with acetylcholine. In the crystal structure the anions are oriented stereospecifically with respect to the tetrahedron of the quaternary ammonium group. The geometry o f two triangles formed by the quaternary nitrogen atom, the oxygen atom o f the carbonyl group, and by either o f the two anions nearest to the quaternary ammonium group is characteristic for the nicotinic activity o f 1. 
  Reference    Z. Naturforsch. 37c, 282 (1982); received December 231981 
  Published    1982 
  Keywords    X-ray, Neurotransmitter, Cation-Anion Interactions, Structure-Activity Relationships 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0282.pdf 
 Identifier    ZNC-1982-37c-0282 
 Volume    37 
143Author    S.Requires cookie*
 Title    Untersuchungen an Stickstoff-Jod-Verbindungen, XV1 Neue Addukte des StickstofFtrijodids mit tertiären N-Basen - Chinuclidiniumpentajodid (Chin H )J3-J2, ein neues Polyjodid  
 Abstract    tu d ies on N itrogen -Iod in e Com pounds, X V 1 N ew A d d u cts o f N itrogen Triiodide w ith T ertiary N -B ases -C hinuclidinium pentaiodide (Chin H)I 3 • I 2, a N ew P olyiodide J o c h e n J a n d e r , H a n s P r it z k o w u n d K l a u s -U w e T r o m m s d o r f f New adducts of nitrogen triiodide with several tertiary N-bases have been prepared. Their analyses, general properties, IR-spectra and structures are reported briefly. E x ­ periments to crystallize a compound with a ratio N : I : chinuclidin = 1:4:1 resulted in the preparation of cristallized chinuclidiniumpentaiodide (chin H)l3 -l2 , the X-ray structure analysis of which is reported. 
  Reference    (Z. Naturforsch. 30b, 720—723 [1975]; eingegangen am 21. April/20. Mai 1975) 
  Published    1975 
  Keywords    Nitrogentriiodide, Tertiary N-bases, Adducts, Properties, Chinuclidiniumpentaiodide, X-ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0720.pdf 
 Identifier    ZNB-1975-30b-0720 
 Volume    30 
144Author    MichaelB. Hursthouse, RobertA. Shaw, Keith Wait, MichaelW., Oods, HonSum YuRequires cookie*
 Title      
  Reference    (Z. Naturforsch. 31b, 995—996 [1976]; received March 4/April 2 1976) 
  Published    1976 
  Keywords    Cyclotriphosphazadiene, if! NMR, X-ray, Crystal Structure, Double hydrogen-bonded tricycle 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0995_n.pdf 
 Identifier    ZNB-1976-31b-0995_n 
 Volume    31 
145Author    T.Stanley Cameron, JamesD. Healy, RobertA. Shaw, Michael WoodsRequires cookie*
 Title      
 Abstract    The structure of the title compound was determined by X-ray crystallography. The compound is a cyclic dimer with short N--O and N---S contacts. 
  Reference    (Z. Naturforsch. 31b, 1421—1422 [1976]; received July 19 1976) 
  Published    1976 
  Keywords    X-ray, Crystal Structure, Phosphorus Acid-Base Cyclic Dimer, Hydrogen-Bond 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1421_n.pdf 
 Identifier    ZNB-1976-31b-1421_n 
 Volume    31 
146Author    Requires cookie*
 Title    Über Oxocuprate, XXI  
 Abstract    Bariumoxohalogenocuprate(II) mit Strukturbeziehungen zu BaCu02 About Oxocuprate s, X X I Barium Oxohalocuprates(II) with Structure Relationships to B aC u02 R. K ip k a und H k. M ü l l e r -B u s c h b a u m In stitu t für A norganische Chemie der C hristian-A lbrechts-U niversität K iel A ttem p ts to prepare BaCuO-2 single crystals w ith a flux of BaCl2 and BaBi'2 respectively lead to new oxo h a lo cu p ra tes(II): B a44Cu4s0 8 7 Cl4 (A) and B assC ussO nsB ^ (B). Single crystals were in v estig a ted b y X -ra y m ethods (cubic unit cell: (A) a = 1827 pm , (B) a = 1830.3 pm , space group 0 ® -lm 3 m). The com plicated crystal structures o f both com pounds are discussed. There are very in terestin g relationships to BaCu0 2 . 
  Reference    (Z. Naturforsch. 32b, 124—126 [1977]; eingegangen am 23. November 1976) 
  Published    1977 
  Keywords    B arium, Copper, O xygen, X -ray, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0124.pdf 
 Identifier    ZNB-1977-32b-0124 
 Volume    32 
147Author    Y. Sudhakara Babu, H. Manohar, T.Stanley Cameron, RobertA. ShawRequires cookie*
 Title    a Novel Conformation of the NPPh3 Group  
 Abstract    The X-ray crystal structure of heptachloro-(triphenylphosphazenyl)cyclotetraphosphaza-tetraene N4P4Cl7(NPPh3) reveals a novel con-formation (tending to Type III) of the tri-phenylphosphazenyl group with respect to the adjacent ring segment. This observation is contrasted with the structure of N3P3Cl5(NPPh3) where a Type I conformation is observed. 
  Reference    Z. Naturforsch. 33b, 682—683 (1978); received March 13 1978 
  Published    1978 
  Keywords    Heptachloro(triphenylphosphazenyl)cyclotetra-phosphazatetraene, X-ray, Crystal Structure, Triphenylphosphazenyl Group Conformation 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0682_n.pdf 
 Identifier    ZNB-1978-33b-0682_n 
 Volume    33 
148Author    Markus Wieber, Christian Burschka, Ulrich BaudisRequires cookie*
 Title    Darstellung und Molekülstruktur von 2-Methylthio-l,3,2-benzodithiastibol Preparation and X-ray Structure of 2-Methylthio-l,3,2-benzodithiastibole  
 Abstract    Starting with SbCl3 and 1,2-benzenedithiol, one can easily obtain heterocyclic 2-chloro-1,3,2-benzodithiastibole [1], which, without iso-lation, can be treated with a solution of sodium methanethiolate to yield 2-methylthio-1,3,2-benzodithiastibole. Yellow crystals were obtain-ed by recrystallization from acetonitrile. The compound was found to be monomeric in ben-zene solution. The crystal structure was solved by means of X-ray diffraction methods and could be refined to an .R-value of 0.03 with 870 independent reflections observed. The monoclinic unit cell contains 4 formula units, the space group is P2i/c. The structure can be compared with that of 2-methoxi-l,3,2-benzodioxastibole, a prelimi-nary report of which has been given [2]. The compounds are, however, not isomorphous. Interactions between neighbouring molecules in the thiastibole seem to be significantly weaker than in the corresponding oxygen compound. Verbindungen des Typs R-M<^j^>R', M = P, As, 
  Reference    Z. Naturforsch. 33b, 1051—1052 (1978); eingegangen am 2. Juni 1978 
  Published    1978 
  Keywords    2-Methylthio -1, 3, 2 -benzodithiastibole, Preparation, X-ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1051_n.pdf 
 Identifier    ZNB-1978-33b-1051_n 
 Volume    33 
149Author    Axel Thiele, Joachim FuchsRequires cookie*
 Title    Struktur und Schwingungsspektren von Monomolybdaten und Monowolframaten organischer Kationen Structure and Vibrational Spectra of Monomolybdates and Monotungstates with Organic Cations  
 Abstract    The crystal structures of dicyclohexylammonium-monomolybdate dihydrate [(C6Hh)2NH2]2MO04 • 2 H2O, (I), cyclohexylammonium-monomolybdate, (C6HHNH3)2MO04, (II) and terf-butylammonium-monotungstate, (C4HgNH3)2W04, (III), were elucidated. In I the anion has nearly tetrahedral structure, in II one Mo-0 distance is significantly shorter than the other three, and in III all four W-0 distances are different. In spite of the variety of structures the following basic principles are recognizable: 1) Each hydrogen atom of the cationic amino groups as well as of the water of crystallization forms hydrogen bridges. 2) Never are oxygen atoms of the same M0O4 connected by these bridges, but always oxygen atoms of neighbouring M0O4 units. 3) From an oxygen atom emanate either two or no hydrogen bridge. For the investigated molybdates (tungstates) there are in all instances isomorphous tungstates (molybdates). The number and position of the vibrational bands is in good agreement with the observed anion symmetry Td, C3V and Ci, respectively. 
  Reference    Z. Naturforsch. 34b, 145—154 (1979); eingegangen am 23. Oktober 1978 
  Published    1979 
  Keywords    Monomolybdates, Monotungstates, Organic Cations, Properties, X-ray, Vibrational Spectra 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0145.pdf 
 Identifier    ZNB-1979-34b-0145 
 Volume    34 
150Author    W. Stoeger, A. RabenauRequires cookie*
 Title    Darstellung, Eigenschaften und Kristallstruktur von TlgAu^j 0 Preparation, Properties, and Crystal Structure of TI6AU2I10  
 Abstract    TI6AU2I10 forms black crystals with a golden luster. In a closed system the temperature of decomposition is 276 °C. In vacuum or under inert gas TlßA^Iio decomposes above 65 °C forming 1 mol I2. Above 180 °C a second mol I2 is formed giving Til and gold. The space group is P 62c with the lattice constants a = 10.569 and c = 13.431 A and Z = 2. TI6AU2I10 is built up by a framework of Tlßlß with channels parallel to the c-axis. These channels contain Au + mainly with a trigonal planar coordination or linear IJj-polyiodide ions and I -ions, resp. 
  Reference    Z. Naturforsch. 34b, 685—692 (1979); eingegangen am 24. Januar 1979 
  Published    1979 
  Keywords    X-ray, Structure Determination, Polyhalides, T1 Halides, Au Halides 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0685.pdf 
 Identifier    ZNB-1979-34b-0685 
 Volume    34 
151Author    Alfred Schmidpeter, Heinz Eiletz, Joachim Von Seyerl, Gottfried Huttner, @bulletH N Jr, Ph 2%, ^. Pph, N. Ph, P. ^pph, Ch, N. N.Requires cookie*
 Title    Struktur eines Spirobi(cyclophosphazens) [1] Structure of a Spirobi(cyclophosphazene) [1] Ph2p" *PPh2 N N0 N N I II Ph2P^ PPh2 Ph,P^ x PPh, 11 | 2 N^ ^NH N^N  
 Abstract    Proton addition to the spirobi(cyclotriphosphazene) anion 1 gives the neutral species 2. An X-ray structure determination shows the proton to be located at a nitrogen atom next to the spirocenter. The structural consequences of this protonation can be demonstrated by comparisons of intramolecular bond distances and angles and can be understood in terms of structure-determining repulsive N/N interactions in the central PN4 unit. Die alternierende Verknüpfung von tetrakoordi-niertem Phosphoniumphosphor und zweifach ko-ordiniertem Amidstickstoff _p® -N-führt mit m = n—1 zu kationischen offenkettigen, mit m = n zu neutralen monocyclischen und mit m = n -f 1 zu anionischen bicyclischen Phosphage-nen [2]. Die beiden erstgenannten Fälle sind mit n^ 2 bzw. n ^ 3 zahlreich verwirklicht, für den dritten Fall ist das Spirophosphazen-Anion 1 mit n = 5 das bislang einzige Beispiel [2], Protonierung bzw. Methylierung überführen 1 in die Neutral-verbindungen 2 und 3. Für 3 zeigt das 31 P-NMR-Spektrum, daß die Methylgruppe an einen dem Spirozentrum benachbarten Stickstoff gebunden ist. Dagegen läßt sich die Stellung des Protons in 2 wegen seiner Beweglichkeit in Lösung nicht in glei-cher Weise bestimmen [3]. Die angegebene Stellung ist jedoch aufgrund einer Abschätzung der Basizi-tätsverteilung und in Analogie zu 3 wahrscheinlich [2], Sie wird jetzt durch die Strukturbestimmung bestätigt und anhand der Strukturdiskussion auch plausibel. Cyclotriphosphazenringe [4] stellen ziemlich regel-mäßige Sechsecke dar. Sie weichen allgemein nur geringfügig von der Planarität ab, und die Summe Ph,P^ ^pph 2 3 der Innenwinkel beträgt fast oder genau 720°. Die Winkel am Stickstoff sind dabei etwas größer, die am Phosphor etwas kleiner als 120°. So wurden bei dem für einen Vergleich mit 2 am besten geeigneten (Ph2PN)3 122,1 bzw. 117,8° (Summe 719,7°) gefun-den. Der große Innenwinkel bedeutet eine erhebliche Verzerrung der tetraedrischen Phosphorkoordina-tion. Ihm muß ein entsprechend verengter Winkel zwischen den exocyclischen Substituenten gegen-übertreten. Er liegt allgemein bei 100°, bei (Ph2PN)3 beträgt er 103,8°. In 2 stehen nun am Spirozentrum einander zwei endocyclische NPN-Winkel gegen-über, und es stellt sich die Frage nach den struk-turellen Konsequenzen dieser Situation. Strukturbestimmung Die zur Strukturbestimmung verwendeten Kri-stalle von 2 wurden aus Acetonitril gewonnen und enthalten je Molekül 2 ein Lösungsmittelmolekül. Zellkonstanten und Intensitäten wurden auf einem P3-Diffraktometer bestimmt (A-MoKa = 71,069 pm, 912 A. Schmidpeter et al. • Struktur eines Spirobi(cyclophosphazens) Graphit-Monochromator, T = 200 K, co-scan, Aco = 
  Reference    Z. Naturforsch. 34b, 911—914 (1979); eingegangen am 2. März 1979 
  Published    1979 
  Keywords    Spirocyclic Phosphazene, Basicity Distribution, Coulombic Repulsion of Adjacent N, X-ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0911.pdf 
 Identifier    ZNB-1979-34b-0911 
 Volume    34 
152Author    Ekkehard Lindner, Sadek Trad, Sigurd Hoehne, Hans-Henning OetjenRequires cookie*
 Title    Präparative, spektroskopische und kristallographische Untersuchungen an Phosphinato-Komplexen des Rheniums mit verschiedenen einzähnigen Liganden Preparative, Spectroscopic and Crystallographic Investigations on Phosphinato Complexes of Rhenium with Various Unidentate Ligands  
 Abstract    The stable phosphinato complexes [^-R2P02Re(C0)3L]" (1, 2b-f) [L = THF (a), py (b), NH3 (c), P(C6H5)3 (d), AS(C6H5)3 (e), P(C6Hn)3 (f), 0(C2H5)2 (g)] are obtained by addition of the ligands L to the compounds 0-R2P02Re(C0)3]M (1, 2) [R = CH3 (1), C6H5 (2)] at 20-40 °C (1, 2c: —35 °C). 1, 2b, d, e are also formed when THF in 1, 2a is substituted by the ligands b, d, and e. The unstable ether adducts 1, 2g which result photochemically from Re2(CO)io and the acids R2P02H, are transformed to 1, 2 by elimination of ether. At 20 °C 1, 2 a react with liquid ammonia to give the ionic complexes [(0C)3Re(NH3)3][02PR2] (1, 2h). On the basis of their mass and vibrational spectra, and a crystallographic in-vestigation, the methyl [la-f] and phenyl compounds [2 a-f] are dimeric and oligomeric, respectively. The rhenium atoms are bridged via R2P02~ ligands (phosphinato-0,0'). la crystallizes monoclinic in the space group C2/m with Z = 2. Stabile, monomere Chelatkomplexe des Mangans und Rheniums mit zweizähnigen Carboxylat-oder Phosphinat-Liganden des Typs RCE2M(CO)3L bzw. 
  Reference    Z. Naturforsch. 34b, 1203—1212 (1979); eingegangen am 28. Mai 1979 
  Published    1979 
  Keywords    Phosphinato Complexes, Rhenium(I), MS, IR, Raman, X-Ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1203.pdf 
 Identifier    ZNB-1979-34b-1203 
 Volume    34 
153Author    Franz Lux, OskarF. Beck, Heinz Krauß, David Brown, TzeC. TsoRequires cookie*
 Title    Spektralreines Bis(phthalocyaninato)protactinium(rV) Spectroscopically Pure Bis(phthalocyaninato)protactinium(IV)  
 Abstract    Spectroscopically pure PaPc2 has been prepared by reaction between Pal4 • 4 CH3CN and o-phthalic acid dinitrile in 1-chloronaphthalene followed by sublimation at 5 • 10~ 3 Pa in a temperature profile with three clearly defined zones (520 °C/350 °C/room temperature). This procedure gives a product almost completely free of H2Pc impurity which is known to have been present in previously reported complexes of the type AnPc2. Thus, the trace of H2Pc in the substance could only be detected by derivative spectroscopy. X-ray powder diffraction shows the compound to be isostructural with ThPc2 and UPc2. The ligand spectrum is typical of AnPc2 complexes, f-f Bands observed in a solid state spectrum provide additional proof that the compound is Pa IV Pc2. 
  Reference    Z. Naturforsch. 35b, 564—567 (1980); eingegangen am 21. Januar 1980 
  Published    1980 
  Keywords    Protactinium(IV) Complexes, Phthalocyaninato Complexes, Ligand Spectra, Structure, X-ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0564.pdf 
 Identifier    ZNB-1980-35b-0564 
 Volume    35 
154Author    HerbertW. Roesky, SushilK. Mehrotra, Christoph Platte, Djammschid Amirzadeh-Asl, Bernhard RothRequires cookie*
 Title    und die Röntgenstrukturanalyse eines phosphorhaltigen achtgliedrigen SN-Ringes Synthesis of Four-and Eight-Membered Heterocycles Containing Sulfur, Nitrogen and Phosphorus and the X-ray Structure of a Phosphorus-Containing Eight-Membered SN-Ring  
 Abstract    Eight-membered rings of the composition [S02(NR)2PR']2 3a-d with R = CH3, C2H5, and R' = CH3, CßHs, were prepared from substituted sulfamides and dichlorophosphanes in the presence of a tertiary amine. These molecules were characterized on the basis of X H and 31 P NMR investigations and of mass spectra. 3 a reacts with phosphorus penta-chloride to yield the spirocyclic derivative 4 with the phosphorus atom in the center of two four-membered rings. Methyliodide reacts with 3 a and 3 b under opening of the eight-membered ring and formation of phosphonium salts. The structure of 3 b is discussed in detail. 3b crystallizes in the orthorhombic space group Pna2i with a = 12.60(0), b = 13.27(1), c — 12.62(4) A. 
  Reference    Z. Naturforsch. 35b, 1130—1136 (1980); eingegangen am 9. Mai 1980 
  Published    1980 
  Keywords    Cyclic Sulfonyl Derivatives, Phosphonium Salts, Spiro Compounds, X-ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1130.pdf 
 Identifier    ZNB-1980-35b-1130 
 Volume    35 
155Author    Marion Lindemami, Reinhard Benn, Richard Goddard, Carl KrügerRequires cookie*
 Title    Friedrich-Wilhelm Grevels  
 Abstract    Extended photolysis of M(CO)ö (M = W, Mo) and methyl acrylate or dimethyl fumarate results in formation of (^ 2 -olefin)2M(CO)4 via the less stable (^ 2 -olefin)M(CO)5 complexes. X-ray structure analysis of (^-methyl acrylate)2W(CO)4 reveals the trans-staggered arrangement of the olefinic ligands. Rotational barriers are determined by variable temperature NMR spectroscopy. 
  Reference    Z. Naturforsch. 35b, 1298—1309 (1980); eingegangen am 2. Mai 1980 
  Published    1980 
  Keywords    Carbonyltungsten Olefin Complexes, Photochemistry, NMR Spectra, Fluxional Behaviour, X-ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1298.pdf 
 Identifier    ZNB-1980-35b-1298 
 Volume    35 
156Author    Dierk Knittel, Gabriela WeberRequires cookie*
 Title      
 Abstract    The two stereoisomeric a-azidochalkones (1,3-diaryl-2-azidopropenones) are selectively obtain-able, depending on the temperature, by conden-sation of aldehydes with a-azidocarbonyl compounds. For the higher melting point compound the trans configuration is proved by single crystal X-ray analysis of its triphenyl-phosphazeno derivative. Analogous isomers may now be characterised from their X H NMR parameters. 
  Reference    Z. Naturforsch. 35b, 1326—1327 (1980); received May 21 1980 
  Published    1980 
  Keywords    a -Azidochalkones, S tereosel ecti vity, *H NMR Spectra, X-ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1326_n.pdf 
 Identifier    ZNB-1980-35b-1326_n 
 Volume    35 
157Author    R. Hilgenfeld, W. SaengerRequires cookie*
 Title    Stabilization of a Host-Guest Type Complex by Bifurcated Hydrogen Bonds : 18-crown-6 * (2,4-Dinitrophenylhydrazine)2 a  
 Abstract    The X-ray structure of the 1:2 host-guest complex between 1,4,7,10,13,16-hexaoxa-cyclooctadecane (18-crown-6) and 2,4-dinitrophenylhydrazine is reported. Crystallo-graphy data are: space group P2i/c, a = 8.557(2), b = 16.745(6), c = 12.387(4) Ä, ß = 117.08(13)°, Z = 2, Dm = 1.37 g • cm" 3 , Dc = 1.387 g • cm-3 , m.p. 414 K (decomp.). The present B is 0.11 for 1733 diffractometer data. In the complex, the two 2,4-dinitrophenylhydrazine molecules are located "above" and "below" the plane of the hexaether and related by an inversion centre. They interact with the macrocyclic host via N-H---0 hydrogen bonds, two of which are bifurcated. All the ether oxygens of the crown serve as hydrogen bond acceptors. 
  Reference    Z. Naturforsch. 36b, 242—247 (1981); received October 28 1980 
  Published    1981 
  Keywords    Crown Ether, Dinitrophenylhydrazine Complex, Bifurcated Hydrogen Bonds, X-ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0242.pdf 
 Identifier    ZNB-1981-36b-0242 
 Volume    36 
158Author    M. Krishnaiah, L. Ramamurthy, P. Ramabrahmam, H. ManoharRequires cookie*
 Title    The X-ray Structure of gem-N3P3Cl4(NPPh3)2-Conformation of the NPPh3 Groups  
 Abstract    An X-ray crystallographic study of geminal tetrachlorobis(triphenylphosphazenyl)cyclotri-phosphazatriene reveals Type II conformation of both triphenylphosphazenyl groups with respect to the P-N ring. These results are consistent with 31 P NMR data. The phosphazene ring has a distorted chair conformation. 
  Reference    Z. Naturforsch. 36b, 765—767 (1981); received December 29 1980 
  Published    1981 
  Keywords    Tetrachlorobis(triph9nylphosphazenyl)-cyclotriphosphazatriene, X-ray, Crystal Structure, Triphenylphosphazenyl Group Conformation 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0765_n.pdf 
 Identifier    ZNB-1981-36b-0765_n 
 Volume    36 
159Author    ErnstOtto Fischer, Willi Kleine, Werner Schambeck, Ulrich SchubertRequires cookie*
 Title    Übergangsmetall-Garben-Komplexe, CXXI [1] Fluorcarbenkomplexe des Mangans Transition Metal Car bene Complexes, CXXI [1] Fluorocarbene Complexes of Manganese  
 Abstract    The reaction between CH3CsH4Mn(C0)3 and LiN(C2Hs)2 and subsequent alkylation with [(C 2 H 5)30]BF4 affords CH 3 C5H4(CO)2MnC(OC2H5)N(C2H5)2. This carbene complex reacts with borontrihalides BX 3 (X = F, Cl) to yield [CH 3 C5H4(C0)2MnCN(C2H 5)2]BX 4 . Ad-dition of [(C 4 H 9) 4 N]F to this cationic carbyne complex results in the formation of CH3C5H4(CO)2MnC(F)N(C2H5) 2 . In the same way C 5 H5(C0)2MnC(F)C 6 H5 is prepared from [CsH^CO^MnCCeHslSbClß. Fluoride addition can be reversed by reaction of the latter carbene complex with BF3 to give [CsH5(CO)2MnCC6H5]BF4. In the X-ray structure of C5H5(C0)2MnC(F)C6H5 unusual bonding parameters are found, which are consistent with the easy cleavage of the C(carbene)-F bond. 
  Reference    Z. Naturforsch. 36b, 1575—1579 (1981); eingegangen am 21. Juli 1981 
  Published    1981 
  Keywords    Cationic Carbyne Complexes, Fluorcarbene Complexes, Fluoride Abstraction, X-ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1575.pdf 
 Identifier    ZNB-1981-36b-1575 
 Volume    36 
160Author    Beate Meyer, Hartmut WunderlichRequires cookie*
 Title    Kristallstrukturen von zwei Modifikationen des Mo(IV)-Komplexsalzes [(Et2PS2)3Mo3S(S2)3] (Et2PS2)- Crystal Structures of Two Modifications of the Mo(IV) Complex Salt [(Et2PS2)3M03S(S2)3] + (Et2PS2)  
 Abstract    Tris(diethyldithiophosphinato)-tris-/<-disulfido-^3-thiotriangulo-trimolybd©num(IV)-di-ethyldithiophosphinate, [(et2PS2)3Mo3S(S2)3] + (et2PS2) _ , crystallizes in two orthorhombic modifications with crystallographic parameters of A: a = 20.651(3), 6=10.152(2), c = 19.019(2) A, Pca2x, Z = 4 and B: a = 20.128(2), 6= 15.655(2), c = 12.608(1) A, Puma, Z = 4. Both crystal structures were determined from 2886 (A) and 3414 (B) X-ray data with R factors of 0.058 and 0.045, respectively. The Mo atoms form a trinuclear Mo3S(S2)3 cluster with local symmetry close to C3V in both modifications which differ in the packing of anions and cations and in the conformation of the ethyl groups. The av. distance Mo-Mo is 2.737 A, the coordination number of the Mo atoms is 7 within the cluster and 9 on inclusion of the S atoms of the dithiophosphinato group. 
  Reference    Z. Naturforsch. 37b, 1437—1441 (1982); eingegangen am 24. Mai 1982 
  Published    1982 
  Keywords    Trinuclear Molybdenum Cluster, Dithiophosphinato Complexes, Crystal Structure, X-ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1437.pdf 
 Identifier    ZNB-1982-37b-1437 
 Volume    37 
Prev
...
6
7
8
9
10
...
Next