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'X ray' in keywords Facet Publication Year 1995 [X]

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1	Author	Norbert Kuhn3, Riad Fawzi3, M. Anfred Steimann3, Jörg Wiethoff3, D. Ieter Bläserb, Roland Boeseb	Requires cookie*
	Title	Synthese und Struktur von 2-Imino-l,3-dimethylimidazolin [1] Synthesis and Structure of 2-Imino-l,3-dimethylimidazoline [1]
	Abstract	Deprotonation of the 2-amino-1,3-dimethylimidazolium salt 5 (obtained through methyla-tion of 2-am ino-l-m ethylim idazole (4)) by KH gives 2-im ino-l,3-dim ethylim idazoline 6. The trimethylsilylimino compound 14 is formed on the reaction of 6 with chlorotrimethylsilane in the ratio 2:1. Further reaction with chlorotrimethylsilane gives the silylated aminoimidazo-lium salt 15. The X-ray structures o f 5 and 6 are reported.
	Reference	Z. Naturforsch. 50b, 1779—1784 (1995); eingegangen am 23. Mai 1995
	Published	1995
	Keywords	Imidazole, Imine, X-Ray
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	Identifier	ZNB-1995-50b-1779
	Volume	50

2	Author	Haruhiko Yokoyama, Saeko Suzuki, Masuo Goto, Kazuteru Shinozaki, Yuriko Abe, Shin-Ichi Ishiguro	Requires cookie*
	Title	X -R a
	Abstract	y D if fr a c tio n S tu d y o f th e S o lv a tio n S tr u c tu r e o f th e C o b a lt (I I) I o n in N ,N -D im e th y lf o rm a m id e S o lu tio n Dedicated to Prof. Hitoshi Ohtaki on the occasion of his 60th birthday The solvation structure of Co2+ in N,N-dimethylformamide (DMF) has been studied by X-ray diffraction measurements on cobalt (II) and magnesium (II) Perchlorate solutions of the same concen tration, using an isostructural substitution method. The radial distribution function revealed three distinct peaks assigned to the oxygen, amido carbon (CJ, and nitrogen atoms of six planar DMF molecules in the first coordination sphere around the metal atom. The distance from the cobalt atom to each atom (O, Cx, N) is 213,299, and 423 pm, respectively. This indicates that the Co-O-Cj bond angle is 122-123° and the metal atom is close to the O-Cj-N plane of the DMF molecule.
	Reference	Z. Naturforsch. 50a, 301—306 (1995); received September 28 1995
	Published	1995
	Keywords	Cobalt, N,N-dimethylformamide, Solvation, X-ray, Structure
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	Identifier	ZNA-1995-50a-0301
	Volume	50

3	Author	Bernd Wrackmeyer, Udo Dörfler, Wolfgang Milius, Max Herberhold	Requires cookie*
	Title	Triferrocenylborane -Molecular Structure in Solution and in the Solid State
	Abstract	According to a single crystal X-ray structure determination all three ferrocenyl substituents of triferrocenylborane (1) adopt the same orientation with respect to the BC3-plane [P 2 Jc\ monoclinic; Z = 4; a = 1353.5(3), b = 1695.6(3), c = 1056.4(2) pm, ß = 109.27(3)°]. The simu lated X-ray powder pattern of the single crystal is identical with the powder diagram o f a macroscopic sample, indicating the presence of a single diastereomer (l a) in the solid state. How ever, at low temperature (< -9 5 °C) in solution, the 13C NM R spectra suggest the pres ence of the second diastereomer (lb) in which one ferrocenyl group is oriented opposite to the other two with respect to the central BC3-plane.
	Reference	Z. Naturforsch. 50b, 201—2 (1995); received July 25 1994
	Published	1995
	Keywords	Triferrocenylborane, 13C NMR Spectra, Dynamic Processes, X-Ray
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	Identifier	ZNB-1995-50b-0201
	Volume	50

4	Author	Thomas Schmidt, Stephan Neis, Richard Goddard	Requires cookie*
	Title	Synthesis, Structure, and Properties of Homoleptic l-Oxa-l,3-diene Molybdenum and Tungsten Complexes
	Abstract	Homoleptic tris(l-oxa-l,3-diene)m olybdenum and tungsten complexes are formed as yel low, crystalline compounds in 54-80% isolated yield on treatm ent of the corresponding /3-unsubstituted a,/3-unsaturated ketones with W (CO)3(CH 3CH 2CN)3 or (y6-C6H 6)M o(CO)3 in refluxing hexane. Reaction of these oxadienes with (^6-C6H 5CH3)2Mo in tetrahydrofuran or /7-hexane provides a new high yield route to homoleptic molybdenum complexes that are otherwise difficult to prepare. X-ray crystal structure analyses of two air-stable, isomeric tungsten complexes reveal a significant contribution of a cr2,?/2-bonding mode in the coordi nated oxadiene moieties. U nder reaction conditions that allow the platinum catalyzed hydro genation of phenyl substituents in these ligands, the coordinated oxadiene fragments are inert, thus demonstrating an unprecedented chemoselectivity in the hydrogenation of aryl-substituted enones. On the other hand, the complexes are labile enough to catalyze the cyclotrimerization of alkynes such as methyl propiolate.
	Reference	Z. Naturforsch. 50b, 315—325 (1995); received September 7 1994
	Published	1995
	Keywords	Oxadiene Complex, Molybdenum, Tungsten, X-Ray, Selective Hydrogenation
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	Identifier	ZNB-1995-50b-0315
	Volume	50

5	Author	B. Gabor, R. Goddard, S. Holle, P. W. Jolly, C. Krüger, R. Mynott, W. Wisniewski	Requires cookie*
	Title	T h e R eaction o f D ien es with [F e (P r z2P ( C H 2) /IP P r /2) ] Species
	Abstract	D ed ica ted to Prof. D r. Dr. h.c. m u lt G ü n th e r W ilk e o n the o cca sio n o f his 70th birthday The structure of the compounds formed upon reacting Fe(Pr'2P(C H 2)"PPr'2)Cl2 (n = 1-3) and active-Mg with acyclic and cyclic 1,3-, 1,4-and 1,5-dienes depends upon the nature of the diene and upon the length of the methylene-chain bridging the two P-atoms of the biden-tate ligand. For example, isoprene reacts to give either (774-isoprene)2FePPr'2C2H4PPr'2 or (^4-isoprene)Fe(Pr'2PC3H6PPr'2) while the products of the reaction with 1,5-hexadiene are (?75-l-methylpentadienyl)Fe(Pr'2PC2H 4PPr'2)H or (//2,?/2-l,5-hexadiene)Fe(Pr'2PC3H6PPr'2). The crystal structures of the last two compounds have been established by X-ray diffraction. The penultimate species catalyses the linear dimerization of 1,5-hexadiene.
	Reference	Z. Naturforsch. 50b, 503—513 (1995); received September 15 1994
	Published	1995
	Keywords	Iron-Organo Complex, Diene Pentadienyl, X-Ray
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	Identifier	ZNB-1995-50b-0503
	Volume	50

6	Author	K. Polborn, W. Steglich, J. D. Connolly, S. Huneck, To Prof, G. Antonio, Gonzalez	Requires cookie*
	Title	Structure of the Macrocyclic Bis-lactone Lepranthin from the Lichen Arthonia im polita; an X-Ray Analysis celebrating his half-century of involvement with natural products chemistry
	Abstract	The structure and relative stereochemistry o f lepranthin from the lichen Arthonia impolita has been elucidated as 1 by NM R spectroscopy and X-ray analysis.
	Reference	Z. Naturforsch. 50b, 1111—1114 (1995); received February 20 1995
	Published	1995
	Keywords	Lepranthin, Macrocyclic Bis-lactone, X-Ray, Lichen
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	Identifier	ZNB-1995-50b-1111
	Volume	50

7	Author	R. Ainer Pöttgen	Requires cookie*
	Title	EuPdGe -a New Germanide with EuNiGe Type Structure
	Abstract	The title compound was prepared from the elem ental com ponents in a tantalum tube at 1070 K and investigated by X-ray diffraction of both powder as well as single crystals. The crystal structure was refined from four-circle diffractometer data: P 2 xln, a = 618.1(1), b = 613.6(1), c = 743.9(1) pm, ß = 109.40(1)°, V = 0.2661(1) nm3, Z = 4 ,w R 2 = 0.0536 for 1564 F2 values and 29 variables. EuPdGe crystallizes with the E uN iG e type structure. Both Pd and G e atom s in EuPdGe have three germanium or palladium neighbors, respectively. They form two-dim ensionally infinite [PdGe] polyanions which consist o f corrugated 4.82 nets. These polyanions are separated by the europium atoms.
	Reference	Z. Naturforsch. 50b, 1181—1184 (1995); received March 1 1995
	Published	1995
	Keywords	Germanide, Crystal Structure, X-Ray, Europium
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	Identifier	ZNB-1995-50b-1181
	Volume	50

8	Author	Wolfgang Pohl, Ingo-Peter Lorenz, Heinrich Nöth, Martin Schmidt	Requires cookie*
	Title	Offene und geschlossene Triferriophosphonium-Salze und Triferriophosphane O pen and Closed Triferriophosphonium Salts and Triferriophosphines
	Abstract	The reaction of P(SiM e3)3 with an excess of C pFe(CO)2X (X = Cl, Br) through the action o f water gives the triferriophosphonium salt [{CpFe(CO)2}3PH]2FeX4 together with ferrocene as by-product. The cation of the salt can be deprotonated by D B U to afford the unstable triferriophosphine {CpFe(CO)2}3P. Its subsequent realkylation with RX (R = Me, CH2Ph; X = I, Br) leads to alkyltriferriophosphonium salts [{CpFe(CO)2}3PR]X. Photolysis of [{CpFe(CO)2}3PH]2FeX 4 induces the elimination of one CO group, and the CO-bridged and partly closed complex [{//-CO(CpFeCO)2}{CpFe(CO)2}PH]2FeX 4 is formed, the cation of which can also be deprotonated to give the corresponding m onobridged phosphine (w-CO(CpFeCO)2}{CpFe(CO)2}P. Both PH-phosphonium salts undergo a hydrogen-chlorine exchange reaction to give the P -C l analogues [{CpFe(CO)2}3PCl]2FeX4 and [{//-CO (CpFeCO)2}{CpFe(CO)2}PCl]2FeX 4. The IR and NM R spectra of all species as well as the X-ray structure analyses of the open and closed P -H functional com plexes are reported and discussed.
	Reference	Z. Naturforsch. 50b, 1485—1493 (1995); eingegangen am 30. März 1995
	Published	1995
	Keywords	Iron, Tristrimethylsilylphosphine, Hydrogen Chlorine Exchange, X-Ray, Decarbonylation
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	Identifier	ZNB-1995-50b-1485
	Volume	50

9	Author	YalcinE. Lerm Ana+, MehmetK. Abaka, Ingrid Svobodab, H. Artm Ut Fuessb-, KlausG. Riesarc, WolfgangH. Aasec	Requires cookie*
	Title	X-Ray Structure and Magnetic Properties of the Tetracupferronato-bis(//-methoxy)-diiron(III) Complex
	Abstract	The tetracupferronato-bis(w-methoxy)-diiron(III) complex has been synthesized in aceto nitrile and its crystal structure determined. C i6H->6N80 1(>Fe2, monoclinic, space group C2/c, a =18.425(3), b = 12.999(2), c = 15.046(3) A, ß = 12 4 .6 6 (2)°,> = 2964(1) A , Z = 4, wR(2) = 0.097 from 1491 reflections (F2). Two iron(III) atoms are at special positions in six-fold co ordination, bridged by O with a F e -O -F e angle of 102.4(1)° and a distance between two iron(III) centers of 3.075(1) A. Temperature-dependent magnetic susceptibility measure ments reveal a antiferromagnetic exchange interaction (J = -1 4 cm -1) betw een the iron(III) centers.
	Reference	Z. Naturforsch. 50b, 1587—1590 (1995); received January 11 1995
	Published	1995
	Keywords	X -Ray, Magnetic Properties, Antiferromagnetic Coupling
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	Identifier	ZNB-1995-50b-1587
	Volume	50

10	Author	Dagmar Holthenrich, Imre Sóvágó, G. Erd Fusch, Andrea Erxleben, EddaC. Fusch, Ingo Rombeck, B.Ernhard Lippert	Requires cookie*
	Title	Heteronuclear Nucleobase Complexes as Tools for the Isolation of the Minor Rotamer of the Parent Compound: Synthesis and Crystal Structure Determination of H ead-H ead and H ead-Tail Forms of rrfl«5-[(CH3NH2)2Pt(l-MeC-Ar J)2]2+ (1-MeC = 1-methylcytosine)
	Abstract	The two rotamers (head-tail, 1, and head-head, 2) of the bis(l-m ethylcytosine)com plex of f/ww-(CH3N H 2)2Pt(II), have been crystallized as C104-(1, 2a) and PF6-(2b) salts and characterized by X-ray crystal structure analysis and 'H and 19:iPt NMR spectroscopy. In aqueous solution, 1 is preferred over 2 by 70:30. Upon slow crystallization from H 2Ö, 1 is obtained as the only product. Isolation of 2a and 2b has now been accomplished via forma tion of the heteronuclear derivative rrans-[(CH3N H 2)2Pt(l-MeCv/V3,./W)2Hg]2+, in which the deprotonated 1-methylcytosinato ligands (1 -M eC) are oriented head-head, precipitation of Hg(II) by thiourea, and rapid crystallization of the parent compound. The solid state struc tures of 1 and 2b differ markedly in a number o f aspects. Isolation of pure 1 and 2 permits a detailed study of the kinetics and thermodynamics of the interconversion of the two rotam ers. From comparison with the behavior of 1 and 2 in H20 on the one hand and DM SO and DM F on the other a clear solvent effect on the rotamer distribution is seen which most likely relates to differences in H bonding between solvent and solute.
	Reference	Z. Naturforsch. 50b, 1767—1775 (1995); received May 15 1995
	Published	1995
	Keywords	Transplatin, Nucleobase, 1-Methylcytosine, R otation, X-Ray
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	Identifier	ZNB-1995-50b-1767
	Volume	50

11	Author	Volker Lorenz3, Bernhard Neumiillerb, Karl-Heinz Thiele3	Requires cookie*
	Title	Synthese und Kristallstrukturen von Diazadien-Komplexen der Erdalkalimetalle Syntheses and Crystal Structures of Diazadiene Complexes of the Alkaline Earth Metals
	Abstract	[C aN R -CPh=CPh-N R (D M E)2] 1 (R = C6H4-4 -C H 3; D M E = dim ethoxyethane) was pre pared by reaction of calcium with N R = C P h -C P h = N R in D M E solution. The compound forms orange, moisture sensitive crystals, which were characterized by an X-ray structure determination [space group orthorhombic, P 2 i2 12 1, Z = 4, 4634 observed unique reflections, R = 0.046; lattice dimensions at -7 0 °C: a = 1340.2(3), b = 1528.1(3), c = 1609.1(3) pm]. The calcium atom is coordinated by the four oxygen atoms of two chelating D M E molecules and two nitrogen atoms of the diazadiene ligand, bonded in its enediam ide form. [Ba2(D M E)3(N P h -C P h = C P h -N P h)2 DM E] 3 was obtained from barium metal and N Ph=C Ph-C Ph=N Ph in D M E solution as red crystals [space group monoclinic, P2!/c, Z = 4, 4000 observed unique reflections, R = 0.166; lattice dim ensions at -7 0 °C: a = 1704.5(3), b = 1786.1(4), c = 2177.4(4) pm, ß = 105.98(3)°]. The two barium atoms are bridged by two differently bonded diazadiene ligands (/<2-N ,N ';/i-N ,a -N '). Additionally, one of the barium atoms is coordinated to two DM E m olecules and the other one to only one of the ether molecules. A further DM E molecule is a constituent of the crystal lattice.
	Reference	(Z. Naturforsch. 50b, 71—7 [1995]; eingegangen am 13. Juli 1994)
	Published	1995
	Keywords	Alkaline Earth Metal Complexes, Diazadiene Ligands, Enediamide Structure, X-Ray
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	Identifier	ZNB-1995-50b-0071
	Volume	50

12	Author	A. Chrissafidou, J. Fuchs, H. Hartl, R. Palm	Requires cookie*
	Title	Kristallisation und Strukturuntersuchung von Alkali-Parawolframaten Crystallization and Structure Determ ination of Alkaline M etal-Paratungstates
	Abstract	The syntheses and crystal structures of the following paratungstates-Z with different alka line cations are reported and discussed: N a10[H2W 120 42]-2 0 H 20 (I), N a10[H2W 12O 42]-2 7 H 20 (II), N a10[H2W 12O47] -2 8 FLO (III), K10[H2W 120 42] 1 0 H 20 (IV), K6Na4[H ,W 120 42]-1 3 H 20 (V), Cs6Na4[H?W P0 42] • 16IÜO (VI), Cs8N a2[H2W 120 42]-1 0 H 20 (VII), Cs8Na2[H2W 120 42] • 12 H20 (VIII), K3N a7[H2W 120 42] -24H 20 (IX) and KsNa2[H2W 120 42] • 12H20 (X). Priority has been set on the description of the coordination of the cations with the oxygen ligands H2W 12O 4210_ and h 2o .
	Reference	Z. Naturforsch. 50b, 217 (1995); eingegangen am 22. Juli 1994
	Published	1995
	Keywords	Paratungstates-Z, Synthesis, Structure Determination, X-Ray, Cation Coordination
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	Identifier	ZNB-1995-50b-0217
	Volume	50

13	Author	Anne Utzolino, Karsten Bluhm	Requires cookie*
	Title	Cox 5Ti0 5(B 0 3) 0 and Co! 5Zro.5(B 0 3) 0
	Abstract	Single crystals of Co15Tio.5(B 0 3)0 (I) and Coj 5Zr0 5(BO3)O (I I) were obtained by a B20 3 flux technique. Both compounds crystallize with orthorhombic symmetry, space group D -Pnma (Nr. 62), I a = 928.1; b = 311.1; c = 940.1 pm; Z = 4 and I I a = 949.5; b = 323.42; c = 934.7 pm; Z = 4. The compounds are isotypic to the mineral warwickite. All metal ions are octahedrally coordinated by oxygen ions. The structure contains isolated, trigonal planar B 0 3 units and oxygen that is not coordinated to boron. Die Synthese und Kristallstruktur von cobalthaltigen Boratoxiden: Coi^Tio,5(B03)0 und C o i?5Zr<),5(B03)0
	Reference	Z. Naturforsch. 50b, 1653—1657 (1995); eingegangen am 4. Mai 1995
	Published	1995
	Keywords	Cobalt, Titanium, Zirconium, Borate Oxide, Crystal Structure, X-Ray
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	Identifier	ZNB-1995-50b-1653
	Volume	50

14	Author	R. Olf, W. Saalfrank3, Klaus Schobert3, Stefan Trümmer3, Alexander Wolskib	Requires cookie*
	Title	Synthese und Koordinationschemie eines neuartigen Bistetrazols: Ein 1 D -M etallopolym er durch Selbstorganisation koordinativ ungesättigter Z in k (II)-M o n o m ere [1] Synthesis and Coordination Chemistry of a New Bistetrazole: A 1 D-Metallopolymer via Self-Assembly of Monomerie Zinc(II)-Buildingblocks
	Reference	Z. Naturforsch. 50b, 642—648 (1995); eingegangen am 10. Oktober 1994
	Published	1995
	Keywords	Bistetrazole, Coordination Polymer 1 D, Bis(bistetrazolato)zink(II) Complex, Spontaneous Self-Assembly, X-Ray
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	Identifier	ZNB-1995-50b-0642
	Volume	50

15	Author	Bernd Wrackmeyer, HeidiE. Maisel, Wolfgang Milius	Requires cookie*
	Title	2-Stannylpyridine-Borane Adducts -Multinuclear Magnetic Resonance Study and X-Ray Structure Determination of a l,4-Dihydro-4 a,l,4-azastannabora-naphthalene Derivative
	Abstract	The adduct formation between 2-trimethylstannyl-pyridine (1) and triethylborane, leading to 2a, and 9-borabicyclo[3.3.1]nonane, leading to 2b, was studied by 'H, " B, 13C, 15N and 119Sn NMR in solution. Changes in the magnitude of the coupling constants 7(119Sn, 13C), with respect to the data for 1, were analysed. The absolute signs have been determined [all coupling constants " /(119Sn,13C) to methyl and pyridine carbon atoms in 1 to 3 possess a negative sign and the same is true for "y(119Sn,*H) of the pyridine hydrogen atoms] by various two-dimensional NMR experiments, and attributed to the influence of the lone pair of electrons at the nitrogen atom in 1. The NMR spectroscopic results for the 1,4-dihydro-4a,l,4-azastannabora-naphthalene derivative 3, in which structural fragments are present analogous to those in the borane adducts 2, correspond to those for 1 and 2a,b. The molecu lar structure of 3 has been determined by X-ray analysis [orthor' nombic; P 2 i2121; a = 713.9(2), b = 1566.0(2), c -1578.4(2) pm]. Solid-state 13C and 119Sn CP/MAS NM R spectra prove that the molecular structures of 3 in the solid state and in solution are very similar.
	Reference	Z. Naturforsch. 50b, 809—815 (1995); received
	Published	1995
	Keywords	O ctober 28, 1994 2-Trimethylstannyl-pyridine, Borane Adducts, Heterobicycle, X-Ray, NM R Spectra
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	Identifier	ZNB-1995-50b-0809
	Volume	50

16	Author	LutzD. Ahlenburg, A.Lexander Wolski	Requires cookie*
	Title	Oligophosphan-Liganden, XXXIX*
	Abstract	(lS,2S)-fraw s-C yclopentan-l,2-diyl-bis(phosphan), C5H 8(P H 2)2? durch Reduktion eines diastereomerenreinen Cyclopentandiyl-bis(dioxaphospholans) O ligophosphine Ligands, X X X IX . (1 5,25')-rra/t5-C yclopentane-l,2-diyl-bis(phosphine), C5FI8(P H 2)2, by R eduction of a D iastereom erically Pure C yclopentanediyl-bis(dioxaphospholane) C hristine E ckert, The title compound (S, S)-2, has been obtained by reduction with Li[A lH 4] o f the cyclopen-tane-l,2-diyl-bis(l',3',2'-dioxaphospholane) (1 5 ,2 S)-frans-C5H 8[P (0 C H (C 0 2Pr-/)-(/ ?) -)2]2, (S, 5")-l, which itself was isolated in diastereomerically pure form (X-ray structure analysis) from the reaction between rac, /rfl«s-CsH8(PCl2)2 and (2 /? ,3 /?)-(+)-d iiso p ro p y l tartrate. C l e a v a g e o f (S ,.S)-1 w i t h P C U y i e l d e d a n u n s e p a r a b l e m i x t u r e o f (1 S , 2 S W r a n s -C 5 H 8(P C l 2) 2 a n d (4 R .5 R) -C l P [ 0 C H (C 0 2P r -t) -]2.
	Reference	Z. Naturforsch. 50b, 1004—1008 (1995); eingegangen am 30. N ovem ber 1994
	Published	1995
	Keywords	Chiral Bis(phosphine) Reduction of P -O, X-Ray, Mass Spectra, NM R Spectra
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	Identifier	ZNB-1995-50b-1004
	Volume	50

17	Author	Neda, Michael Farkens, Holger Thönnessen, PeterG. Jones, Reinhard Schmutzler	Requires cookie*
	Title	Zur Chemie der l,3,5-Triaza-2-phosphorinan-4,6-dione. Teil X*. Umsetzungen von 2-Hydro
	Abstract	l,3,5-trimethyl-l,3,5-triaza-2-oxo-2A4-phosphorinan-4,6-dion mit Triazin-Derivaten sowie mit einigen Aldehyden Chemistry of the l,3,5-Triaza-2-phosphorinan-4,6-diones. Part X*. Reactions of 2-H ydro-1,3,5-trim ethyl-1,3,5-triaza-2-oxo-2A4-phosphorinan-4,6-dione with Triazine Derivatives and with Some Aldehydes Ion
	Reference	Z. Naturforsch. 50b, 1833—1 (1995); eingegangen am 8. Mai 1995
	Published	1995
	Keywords	1, 3, 5-Trimethyl-Substituted l, 3, 5-Triaza-2A 4 -phosphorinan-4, 6-diones, NM R Spectra, Mass Spectra, X-Ray
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	Identifier	ZNB-1995-50b-1833
	Volume	50