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  • 1
    Electronic Resource
    Electronic Resource
    Aquabis(3-methyl-4-octanoyl-1-phenyl-5-pyrazolonato-O,O')zinc(II) and Bis(ethanol-O)bis(3-methyl-1-phenyl-4-stearoyl-5-pyrazolonato-O,O')cadmium(II) (1998)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 776-779 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270197019215
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  • 2
    Electronic Resource
    Electronic Resource
    The First Structure of a Vicinal (E)-Fluoroselenoolefin: (E)-(5-Fluoro-4-octen-4-yl)dimethylselenonium Picrate (1996)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 644-647 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structure of the title compound, C10H20FSe+.C6H2N3O7-, synthesized from (E)-4-methylseleno-5-fluoro-4-octene with trimethyloxonium tetrafluoroborate, followed by anion exchange with natrium picrate, proves the trans addition of RSeF equivalents in the fluoroselenenylation of acetylenes with XeF2–R2Se2 and XeF2–PhSeSiR3 reagents [dihedral angle Se-C4-C5-F −178.7 (1)°].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270195014260
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  • 3
    Electronic Resource
    Electronic Resource
    Ligand Exchange Reactions of ReOCl3(PPh3)2 with Tridentate Diacidic Ligands with the Donor Set O⌢N⌢O(N): Molecular and Electronic Structures of the Resulting Oxo-rhenium(V) Complexes (1999)
    Springer
    Structural chemistry 10 (1999), S. 105-119 
    Details
    ISSN: 1572-9001
    Keywords: Crystal structures ; rhenium complexes ; tridentate ONO and ONN ligand complexes ; oxo complexes ; molecular mechanics ; quantum chemical calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of oxo-rhenium complexes of the type ReO(LLL)(LLLH) with tridentate diacidic ligands (LLLH2) containing the donor set $$O\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\frown}$}}{ } N\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\frown}$}}{ } O\left( N \right)$$ has been synthesized and characterized. X-ray analyses were carried out for benzoylacetone-2-hydroxyanilato(2-)-benzoylacetone-2-hydroxyanilato-oxo-rhenium(V) ReO(BAHA)2 1, [2,6-diphenylacylpyridinato(2-)]-2,6-diphenylacylpyridinato-oxo-rhenium(V) ReO(DPAP)2 2, [2-pyrrolaldehyde-2′-hydroxyanilato-(2-)]-2-pyrrolaldehyde-2′-hydroxyanilato-oxo-rhenium(V) ReO(PAHA)2 3, {4-[1-(N′-benzoylhydrazino)-1-phenyl-methyliden]-3-methyl-1-phenyl-pyrazol-5-onato-(2-)} – {4-[1-(N′-benzoylhydrazino)-1-phenyl-methyliden]-3-methyl-1-phenyl-pyrazol-5-onato}-oxo-rhenium(V) ReO(BHMP)2 5, and for the ligand 4-[1-(N′-benzoylhydrazino)-1-phenyl-methyliden]-3-methyl-1-phenyl-pyrazol-5-one (BHMP). In all the oxo-rhenium complexes the rhenium is in a distorted octahedral coordination environment with one ligand acting as tridentate in the equatorial plane and the other ligand acting as bidentate in the axial position. The Re — Nbond lengths were found to be in the range of 2.01 to 2.18 Å depending on the nature of the bond caused by mesomeric and steric effects of the ligands. In order to check the bonding relationships, molecular orbital calculations with Gaussian 94 were carried out. Additionally force field calculations were performed using the Extensible Systematic Force Field (ESFF). This was done to examine the ability of the ESFF to represent the bonding relationships in order to provide reasonable input data for MO calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022081213434
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular Mechanics Calculations on Chelates of Titanium(IV), Vanadium(IV/V), Copper(II), Nickel(II), Molybdenum(IV/V), Rhenium(IV/V) and Tin(IV) with Di- and Tridentate Ligands Using the New Extensible Systematic Force Field (ESFF)—An Empirical Study (1998)
    Springer
    Structural chemistry 9 (1998), S. 77-93 
    Details
    ISSN: 1572-9001
    Keywords: Molecular mechanics ; ESFF force field ; Chelates of titanium(IV) ; vanadium(IV/V) ; copper(II) ; nickel(II) ; molybdenum(IV/V) ; rhenium(IV/V) ; and tin(IV) ; di- and tridentate ligands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Force field calculations were performed on a series of 27 transition metal complexes of titanium(IV), vanadium(IV/V), copper(II), nickel(II), molybdenum(IV/V), rhenium(IV/V), and tin(IV) with a broad variety of di- or tridentate ligands in order to find a reliable scheme for determining the molecular structure of such chelates with the new Extensible Systematic Force Field (ESFF). A good agreement between theoretical results and experimental data was achieved. In some cases an unspecific fitting of the force field was necessary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022455602963
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  • 5
    Electronic Resource
    Electronic Resource
    13C-CP/MAS-NMR spectroscopy of tridentate diacidic ligands and their titanium(IV) chelates. molecular structure of bis[benzoylacetone thiobenzoylhydrazonato(2-)]titanium(iv) (1997)
    Springer
    Structural chemistry 8 (1997), S. 211-216 
    Details
    ISSN: 1572-9001
    Keywords: Titanium(IV) chelates ; tridentate diacidic ligands ; donor set ONO(S) ; 13C-CP/MAS-NMR spectra ; crystal structure of bis[benzoylacetone thiobenzoylhydrazonato(2-)]titanium(IV)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of tridentate diacidic ligands having the donor set ONO(S) as well as the corresponding titanium(IV) chelates were studied by13C-CP/MAS-NMR spectroscopy. Structural changes caused by the complex formation are discussed. The crystal structure of bis[benzoylacetone thiobenzo-ylhydrazonato(2-)]titanium(IV) was determined by X-ray analysis as to be distorted trigonal prismatic. Orthorhombic space group Pca2l,Z=4, 3304 observed independent reflections, unit-cell parameters at 298 K:a=22,808(2) å,b=13,073(4) å,c=10,450(4) å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02263509
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  • 6
    Electronic Resource
    Electronic Resource
    Reaktionen und thermisches Verhalten oxofreier Vanadium(IV)-Komplexe. Kristallstrukturen von Methoxo-oxo[thenoyltrifluoraceton-salicylhydrazonato(2-)]vanadium(V) und Methoxo-oxo[benzoylaceton-salicylhydrazonato(2-)]vanadium(V) (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 488-494 
    Details
    ISSN: 0044-2313
    Keywords: Vanadium(IV) complexes ; syntheses ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions and Thermal Behaviour of Nonoxo Vanadium(IV) Complexes. Crystal Structures of Methoxo-oxo[thenoyltrifluoroacetone-salicylhydrazonato(2-)]vanadium(V) and Methoxo-oxo[benzoylacetone-salicylhydrazonato(2-)]vanadium(V)The persistence of non-oxo vanadium(IV) complexes in dichlormethane/methanol/water solutions was studied by UV/VIS spectroscopy. The reaction products methoxo-oxo-[thenoyltrifluoroacetone-salicylhydrazonato(2-)]vanadium(V) and methoxo-oxo[benzoylacetone-salicylhydrazonato(2-)]vanadium(V) were isolated and characterized by X-ray analysis. The thermal behaviour of non-oxo vanadium(IV) complexes was checked.
    Notes: Die Beständigkeit oxofreier Vanadium(IV)-Komplexe mit dreizähnigen diaciden Liganden in Dichlormethan/Methanol/Wasser wurde UV/VIS-spektroskopisch untersucht. Als Reaktionsprodukte wurden Methoxo-oxo-[thenoyl-trifluoraceton-salicylhydrazonato(2-)]vanadium(V) sowie Methoxo-oxo-[benzoylaceton-salicylhydrazonato(2-)]vanadium(V) isoliert und röntgenstrukturanalytisch charakterisiert. Das thermische Verhalten der oxofreien Vanadium(IV)-Komplexe wurde analysiert.Methoxo-oxo-[thenoyltrifluoraceton-salicylhydrazonato(2-)]-vanadium(V), Raumgruppe P21/a2, Z = 4, 3 124 beobachtete unabhängige Reflexe, R = 0,0579, Gitterabmessungen bei 25°C; a = 800,0(2) pm, b = 2 027,3(6) pm, c = 1 165,0(3) pm, β = 109,03(2)° Methoxo-oxo-[benzoylaceton-salicylhydrazonato(2-)]vanadium(V) Raumgruppe P21/c, Z = 4, 2 312 beobachtete unabhängige Reflexe, R = 0,031, Gitterabmessungen bei 25°C: a = 1 122,6(1) pm, b = 772,96(9) pm, c = 2 021,2(4) pm, β = 95,32(1)°.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210327
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  • 7
    Electronic Resource
    Electronic Resource
    Struktur und ausgewählte Reaktionen von ReCl4(PPh3)2 (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1797-1799 
    Details
    ISSN: 0044-2313
    Keywords: Tetrachloro-bis(triphenylphosphane)rhenium(IV) ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: ReCl4(PPh3)2 - Reactions and StructureThe compounds ReCl4(PPh3)2 and Re2OCl3(C2H5COO)2(PPh3)2 resulting from the reaction of ReOCl3(PPh3)2 with PPh3 in boiling propionic acid and HCl atmosphere were characterized by their VIS-spectra and structural data.Ligand exchange reactions with acetylacetone gave ReCl2(acac)2 as well as ReCl2(acac)(PPh3)2.Crystallographic data see “Inhaltsübersicht”.
    Notes: Die bei der Umsetzung von ReOCl3(PPh3)2 mit PPh3 in siedender Propionsäure unter HCl nebeneinander entstehenden Verbindungen ReCl4(PPh3)2 und Re2OCl3(C2H5COO)2(PPh3)2 wurden spektroskopisch und röntgenographisch charakterisiert. Bei Ligandenaustauschreaktionen mit Acetylaceton wurden sowohl ReCl2(acac)2 als auch ReCl2(acac)(PPh3)2 identifiziert.ReCl4(PPh3)2: Raumgruppe P21/n; Z = 2; 2 908 beobachtete unabhängige Reflexe; R = 0,0322; Gitterabmessungen bei 210 K: a = 9,324(4) Å; b = 20,93(1) Å; c = 9,636(4) Å; β = 117,66(1)°.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956211031
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  • 8
    Electronic Resource
    Electronic Resource
    Chelate von Chinolin-8-01-Derivaten. V [I]. Komplexbildung und Extraktion von Nickel mit alkylsubstituierten Chinolin-8-olen (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 520 (1985), S. 167-178 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chelates of 8-Quinolinol Derivatives. V. Coordination and Extraction of Nickel with Alkylsubstituted 8-Quinolinols.The nickel chelates of 2-, 5-, and 7-methyl-8-quinolinols and of a series of 7-alkyl-8-quinolinols were synthesized in the water-free state. Spectroscopic and magnetochemical differences between the compounds with 2-, 5-, and 7-methyl-8-quinolinols were explained by structural peculiarities. For the nickel chelates with 7-alkyl-8-quinolinols a somewhat distorted square-planar structure is supposed. To characterize the influence of substituents the adduct formation with pyridine was studied. For the extraction of nickel with 8-quinolinols the kind of the alkyl or alkenyl substituent in 7-position has no distinct influence on the state of the extraction equilibrium but it impairs the quickness of the extraction with increasing hydrophobicity.
    Notes: Die Nickelchelate von 2, 5- und 7-Methylchinolin-8-ol sowie einer Reihe von 7-Alkyl-chinolin-8-olen wurden in wasserfreiem Zustand dargestellt. Spektroskopische und magnetochemische Unterschiede der Verbindungen mit 2-, 5-und 7-Methylchinolin-8-ol können auf strukturelle Besonderheiten zurückgeführt werden. Bei den Nickelchelaten 7-substituierter Chinolin-8-ole-sind planar-quadratische Strukturen mit geringer tetragonaler Verzerrung anzunehmen. Der Charakterisierung des Substituenteneinflusses diente die Untersuchung der Adduktbildung mit Pyridin. Bei der Extraktion von Nickel mit 7-Alkyl-bzw. 7-Alkenyl-chinolin-8-olen ist die Art des Substituenten nor von geringem Einfluß auf die Lage des Extraktionsgleichgewichtes, beeinträchtigt aber mit steigender Hydrophobizität stark die Geschwindigkeit der Extraktion.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855200120
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  • 9
    Electronic Resource
    Electronic Resource
    Chelate von Chinolin-8-ol-Derivaten. VIII. Säure- und Komplexstabilitätskonstanten alkyl- bzw. alkenylsubstituierter Chinolin-8-ole (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 534 (1986), S. 199-205 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chelates of 8-Quinolinol Derivatives. VIII. Acid and Complex Stability Constants of Alkyl and Alkenyl Substituted 8-QuinolinolsFor a series of 7-substituted alkyl and alkenyl 8-quinolinols as well as 2-, 5-, and 7-methyl-8-quinolinols the acid constants and the stability constants of the nickel and zinc chelates were determined potentiometrically in 75 vol-% dioxane-water mixture. Methyl groups, as expected, increase the basicity of both donor atoms of the 8-quinolinols, whereas alkyl substituents in 7-position cause a decrease in basicity of the quinoline N-atom. The influence of substituents on the complex stability is only small.
    Notes: Für eine Reihe 7-substituierter Alkyl- bzw. Alkenylchinolin-8-ole sowie der isomeren 2-, 5- und 7-Methylchinolin-8-ole wurden auf potentiometrischem Wege in 75 Vol.-% Dioxan-Wasser-Mischung die Säurekonstanten und die Komplexstabilitätskonstanten der Nickel-und Zinkchelate bestimmt. Methylsubstituenten erhöhen erwartungsgemäß die Basizität beider Donoratome des Chinolin-8-ols, Alkylgruppen in 7-Position verursachen dagegen eine Abnahme der Basizität des Chinolinstickstoffs. Der Substituenteneinfluß auf die Komplexstabilität ist nur gering.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865340324
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  • 10
    Electronic Resource
    Electronic Resource
    Chelate von Chinolin-8-ol-Derivaten. VI. Komplexbildung und Extraktion von Kupfer mit alkyl- bzw. alkenylsubstituierten Chinolin-8-olen (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 524 (1985), S. 193-200 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chelates of 8-Quinolinol Derivatives. VI. Complex Formation and Extraction of Copper with Alkyl and Alkenyl Substituted 8-QuinolinolsThe copper chelates of a series of 7-substituted alkyl and alkenyl 8-quinolinols as well as 2-, 5-, and 7-methyl-8-quinolinols were synthesized and the chemical bonding was studied by EPR spectroscopy in chloroform and pyridine solution. Spectral changes in the chloroformic solutions of the chelates produced by pyridine are the result of a slow destruction reaction. For the extraction of copper in the chloroform/water system the extraction parameters as well as distribution data of the ligands were determined.
    Notes: Die Kupferchelate einer Anzahl 7-substituierter Alkyl- bzw. Alkenylchinolin-8-ole sowie der isomeren 2-, 5- und 7-Methyl-chinolin-8-ole wurden dargestellt und die Bindungsverhältnisse EPR-spektroskopisch in Chloroform und Pyridin untersucht. Spektrale Veränderungen der chloroformischen Lösungen der Chelate durch Pyridin sind auf eine langsam erfolgende Zersetzung zurückzuführen. Für die Extraktion von Kupfer im System Chloroform/Wasser wurden die Extraktionsparameter bestimmt und durch Angaben zur Verteilung der Liganden ergänzt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855240525
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