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1Author    FriedrichFranz SeeligRequires cookie*
 Title    Chemical Oscillations by Substrate Inhibition A Parametrically Universal Oscillator Type in Homogeneous Catalysis by Metal Complex Formation  
 Abstract    The general reaction X+Y-^-P + Q, catalyzed by a metal M via M-fX^MX and MX+Y 
  Reference    (Z. Naturforsch. 31a, 731—738 [1976]; received May 12 1976) 
  Published    1976 
  Keywords    Chemical Oscillation, Substrate Inhibition, Homogeneous Catalysis, (Transition) Metal Complexes 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0731.pdf 
 Identifier    ZNA-1976-31a-0731 
 Volume    31 
2Author    ThomasG. Meyer, PeterG. Jones, Reinhard SchmutzlerRequires cookie*
 Title    Darstellung neuer Monofluorphosphine und einiger ihrer Übergangsmetallkomplexe; Einkristall-Röntgenstrukturanalyse eines Platin(II)-Komplexes Preparation of New M onofluorophosphines and Some o f their Transition Metal Complexes; Single Crystal X-Ray Diffraction Study o f a Platinum (II) Complex  
 Abstract    The reaction of lithiated precursors with PC12F led to a num ber of monofluorophosphines, including the known di-/e>7-butylmonofluorophosphine, 1. Bis(phenylethinyl)monofluoro-phosphine (2) was accessible only via this route (the classical method of synthesizing 2 by chlorine/fluorine exchange is impossible, because the corresponding chlorophosphine is un­ known). Bis(2-methoxyphenyl)fluorophosphine (5) was prepared via the organolithium /PCl2F route. The N M R results for 5 thus prepared were inconsistent with previous reports, implying that the previously reported synthesis o f 5 is in error. From 5 a m -dichloroplatinum (II) com­ plex (6) was synthesized and subjected to a single crystal X-ray structure analysis, confirming the expected planar coordination. From bis(2,3-dimethoxynaphthyl)monofluoro-phosphine (7) a rhodium(I) (8) and an iron(0)tetracarbonyl complex (9) were prepared. An iron(0)tetracarbonyl complex (11) was synthesized from bis(9-anthryl)monofluorophosphine (10) which was found to be stable to redox disproportionation. 
  Reference    Z. Naturforsch. 48b, 875—885 (1993); eingegangen am 16. Februar 1993 
  Published    1993 
  Keywords    Dichlorofluorophosphine, M onofluorophosphines, Transition Metal Complexes, X-Ray 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0875.pdf 
 Identifier    ZNB-1993-48b-0875 
 Volume    48 
3Author    R.Alf Feldhaus, JensK. Öppe, R. Ain, ErM. AttesRequires cookie*
 Title    Komplexe eines vierzehngliedrigen Tetraazadibenzo  
 Abstract    Makrocyclus. Strukturen des freien und zweifach protonierten Liganden und seiner Nickel(II)-, Kupfer(II)-, Zink(II)-und Palladium(II)-Komplexe C om plexes of a 14-M em bered N 4 D ibenzo M acrocycle. Crystal S tructures of the Free and D ip ro to n ated Ligand and of its N ickel(II), C o p p er(II), Z in k (II) and P alladium (II) C om plexes The synthesis and structural characterisation of complexes of the 14-membered macrocy­ clic trans-N4 dibenzo ligand 5,6,7,8,9,14.15,16,17,18-decahydrodibenzo[e,l][l,4, 8,1 l]-tetraaza-cyclotetradecine (L2) is described. The crystal structures of six compounds were determined by single crystal X-ray diffraction. The free ligand L2 has a saddle-shaped structure with short intramolecular hydrogen bonds. The N —N distances are 289 pm. The diprotonated species [H2L2]2+ has a different conformation due to intra-and intermolecular hydrogen bonds. TTie ligand is folded along an N —N axis in c/s-[Ni(L2)(H 20) 2]2+, but displays a saddle­ shaped structure in the Cu(II), Z n(II) and Pd(II) complexes with a more or less planar arrangem ent of the four N donor atoms. The metal atoms are incorporated within the macro-cyclic cavity in [Cu(L2)(CF3S03)]+ and [Pd(L2)]2+. The metal-to-nitrogen bond lengths herein are rather small. Zn(II) is five-coordinate in [Zn(L2)(Cl)]+. The coordination polyhedron is intermediate between a trigonal bipyramid and a square pyramid. In all complexes the metal-to-ligand distances originating at the nitrogen atoms in /^-position (with respect to the arom a­ tic ring) are significantly shorter then the donor bonds of the 1 anilinic' N atoms. 
  Reference    Z. Naturforsch. 51b, 869—878 (1996); eingegangen am 6. November 1995 
  Published    1996 
  Keywords    Macrocyclic N4-Donor Ligands, Transition Metal Complexes, Crystal Structures 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0869.pdf 
 Identifier    ZNB-1996-51b-0869 
 Volume    51 
4Author    Tetraazadibenzo Macrocycle, Ralf Feldhaus, Jens Köppe, Rainer Mattes, Ulrich VoetRequires cookie*
 Title    Synthesis and Structures of the Vanadyl, Cobalt(III), Nickel(II), Copper(II), Zinc(II) and Palladium(II) Complexes of a 14-Membered Unsaturated  
 Abstract    The synthesis and structural characterisation of complexes of the 14-membered macrocyclic trans-N4 dibenzo ligand 7,8,9,16,17.18-hexahydrodibenzo[e,l][ 1,4, 8.11 ]-tetraazacyclotetra-decine (L 1) is described. The crystal structures of six compounds were determined by single crystal X-ray diffraction. In [CuL1 ]2+ the metal atom is tightly bound within the macrocyclic cavity. The Cu-N bonds [201.2(3) and 191.8(3) pm] are rather short. Zn(II) is penta-coordinated in [Zn(L')C l]+ with the metal center outside the cavity. L 1 is deprotonated at one or both secondary amine functions in the complexes [N i(L '-H)]+, [Co(L -2H)]+, [VO(L'-2H)] and [Pd(L'-2H)]. With the exception of [VO (L'-2H)] the metal ions assume nearly square planar N4-coordination, which is very rare for Co(III). Salts of [Co(L'-2H)]+ display a temperature independent magnetic moment of 0,64 B. M. The nickel, cobalt and palladium complexes show remarkably short metal-nitrogen bond distances: Ni-N [183.8(8)], Co-N [181.8(2)] and Pd-N [194.5(6) pm], respectively. The UV/Vis and EPR spectra, and the electrochemical behaviour of some of these complexes are also discussed. 
  Reference    Z. Naturforsch. 51b, 1449—1458 (1996); eingegangen am 1. April 1996 
  Published    1996 
  Keywords    Macrocyclic N4-Donor Ligands, Transition Metal Complexes, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1449.pdf 
 Identifier    ZNB-1996-51b-1449 
 Volume    51 
5Author    Thom As Häusler, W. Illiam, S. SheldrickRequires cookie*
 Title    Metal-Mediated Assembly of Hexameric Ethylcycloarsoxane (C2H5AsO)6 in Mono-and Dinuclear Complexes with Tetrahedral and Octahedral Coordination Spheres  
 Abstract    A metal-assisted ring expansion from the preferred solution species (EtAsO),,, n = 3,4, to the hexameric ligand (EtAsO)6 is observed for the reactions of [ReBr(CO)5], [RuCLCPh^P)?], RhCfv3 H2 0 and [C^CCF.^SO.OaCCftHft)] with ethylcycloarsoxane. Whereas two metal frag­ ments are facially coordinated by the upper and lower three As atoms of a flattened AsftOö cuboctahedron in both [{ReBr(CO)2} 2 {M-[cyc/o-(EtAsO)6]}] (1) and [Cu2{n-[cyclo-(EtAs0)6]}(Me2PhP)2](CF3S03)2 (4), potential ring strain restricts the reaction with the other compounds to the formation of mononuclear complexes [RuCl2{cvc/o-(EtAsO)6}(Ph3P)] (2) 
  Reference    Z. Naturforsch. 52b, 679—686 (1997); received March 6 1997 
  Published    1997 
  Keywords    Ethylcycloarsoxane, Transition Metal Complexes, Metal-Mediation, Ring Expansion 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0679.pdf 
 Identifier    ZNB-1997-52b-0679 
 Volume    52 
6Author    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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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0321.pdf 
 Identifier    ZNB-1999-54b-0321 
 Volume    54 
7Author    Ralph Bergs, Roland Krämer, Michael Maurus, Bernhard Schreiner, Reinhold Urban, ChristopherM. Issling, Kurt Polbom, Karlheinz Siinkel, Wolfgang BeckRequires cookie*
 Title    Metallkomplexe mit biologisch wichtigen Liganden, LXXXIV [1] Halbsandwich-Komplexe von Rhodium(III), Iridium(III), Cobalt(III), Ruthenium(II), Ruthenium(III) und Chrom(III) mit Aminosäureester-Liganden Metal Complexes with Biologically Important Ligands, LXXXIV [1] Half-Sandwich Complexes o f Rhodium(III), Iridium(III), Cobalt(III), Ruthenium(II), Ruthenium(III) and Chromium(III) with Amino Acid Ester Ligands  
 Abstract    A series of cyclopentadienyl and pentamethylcyclopentadienyl complexes of cobalt, rhodium, iridium, ruthenium and chromium with a-amino-acid esters (L) as ligands was prepared and characterized: Cp*(Cl)2M(L) (1, 2: M = Rh, Ir), Cp(I)2Co(L) (4), [Cp(Ph3P)2Ru(L)]+BF~ (6), [Cp(OC)(Ph3P)Ru]+BF^ (7) and the paramagnetic compounds Cp*(Cl)2Ru(L) (8) and Cp(Br)2Cr(L) (9). AlaOMe and HisOMe form N ,0 and N,N chelate complexes [Cp*(Cl)M(alaOMe)]+BF~ (3: M = Rh, Ir), [Cp(I)Co(hisOMe)]+BF4. Cp*Co(CO)I2 and GlyOMe gave the N,0-dipeptide ester complex Cp*(I)Co(glyglyOMe)]+BF^ (5). The crystal structures of Cp(I)2Co(glyOEt) and Cp*(Cl)2Ru(alaOMe) were determined by X-ray diffrac­ tion. The complexes 1 and 2 undergo ester exchange reactions with CD3OD. [Cp*MCl2]2 (M = Rh, Ir) catalyze the exchange of the ethoxy group in Me2NCH2C 0 2Et by CD3OD. 
  Reference    Z. Naturforsch. 51b, 187—200 (1996); eingegangen am 21. Juli 1995 
  Published    1996 
  Keywords    Transition Metal Complexes, Cyclopentadienyl, a-Amino Acid Ester 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0187.pdf 
 Identifier    ZNB-1996-51b-0187 
 Volume    51 
8Author    Henri Brunner, Manfred Muschiol, Wilfried NowakRequires cookie*
 Title    Optisch aktive Übergangsmetall-Komplexe, LVII [1]  
 Abstract    (+)-und (—)-C5H5M(CO)(P02R*)X mit M = Fe, "Fe und X = 1, COCH3, CH3 Optically Active Transition Metal Complexes, LVII [1] (+)-and (—)-C5H5M(CO)(P02R*)X with M = Fe, "Fe, and X = I, COCH3, CH3 In the reaction of C5H5Fe(CO)2l and CsHsFefCO^CHa, respectively, with S-(+)-(C6H5)2PN(CH3)CH(CH3)(C6H5) (abbreviated P02R*) the complexes C5H5Fe(CO)(P02R*)I(l),C5H5Fe(CO)(P02R*)COCH3(2),andC5H5Fe(CO)(P02R !,t)CH3(3) are formed as pairs of diastereoisomers the components of which differ only in the configu-ration at the iron atom. CsH5Fe(CO)(P02R*)CH3 (3) can be obtained in higher yield by photochemical decarbonylation of C5H5Fe(CO)(P02R*)COCH3 (2). The (+)s85-and (—)365-diastereoisomers of each pair exhibit different chemical shifts in the X H NMR spectra. Diastereoisomer separation can be achieved by fractional crystallization. Starting with 57 Fe metal (—)365-C5H5 57 Fe(CO)(P02R*)I was prepared via 57 FeI2, 57 Fe(CO)4l2, C5H5 57 Fe(CO)2l, and C5H5 57 Fe(CO)(P02R*)I in order to demonstrate optical activity of a 57 Fe compound in the y region by Mössbauer polarimetry in later experiments to be reported elsewhere. 
  Reference    Z. Naturforsch. 33b, 407—411 (1978); eingegangen am 24. Januar 1978 
  Published    1978 
  Keywords    Diastereoisomer Separation, X H NMR, Optical Activity, Transition Metal Complexes 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0407.pdf 
 Identifier    ZNB-1978-33b-0407 
 Volume    33 
9Author    Henri Brunner, Heinz VogtRequires cookie*
 Title    Optically Active Transition Metal Complexes, LIX [1]  
 Abstract    The pair of diastereoisomers (+)436-and (—)436-C5H5Fe(CO)(COCH3)P02R*, with P02R* = (S)-(+)-(C6H5)2PN(CH3)CH(CH3)(C6H5), can be separated into its components by preparative liquid chromatography under pressure. On heating (+)436-C5H5Fe(CO)-(COCH3)P02R* equilibrates with C5H5Fe(CO)2CH3 and P02R* before epimerization at the Fe [atom takes place. In the same way, the equilibrium C5H5Fe(CO)(COCH3)P(C6Hs)3 C5H5Fe(CO)2CH3 + P(C6Hs)3 can be obtained starting from either side. It is shown that the decarbonylation C5H5Fe(CO)(COCH3)P(C6H5)3 C5H5Fe(CO)(CH3)P(C6H5)3 + CO is not a thermal but a photochemical reaction. 
  Reference    Z. Naturforsch. 33b, 1231—234 (1978); eingegangen am 6. Juli 1978 
  Published    1978 
  Keywords    Diastereoisomer Separation, Preparative Liquid Chromatography, 1 H NMR, Optical Activity, Transition Metal Complexes 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1231.pdf 
 Identifier    ZNB-1978-33b-1231 
 Volume    33