ZfN: Search Results

1	Author	Ralph Bergs, Roland Krämer, Michael Maurus, Bernhard Schreiner, Reinhold Urban, ChristopherM. Issling, Kurt Polbom, Karlheinz Siinkel, Wolfgang Beck	Requires 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. CpCo(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

2	Author	R.Alf Feldhaus, JensK. Öppe, R. Ain, ErM. Attes	Requires 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

3	Author	Tetraazadibenzo Macrocycle, Ralf Feldhaus, Jens Köppe, Rainer Mattes, Ulrich Voet	Requires 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