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  • 1990-1994  (2)
  • 1980-1984  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Copper(2+) in 5-coordination: a case of a second-order Jahn-Teller effect. 2. Pentachlorocuprate(3-) and other CuIIL5 complexes: trigonal bipyramid or square pyramid? (1984)
    s.l. : American Chemical Society
    Inorganic chemistry 23 (1984), S. 791-798 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00175a001
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  • 2
    Electronic Resource
    Electronic Resource
    Statistics of ion distribution in 1D and 2D mixed crystals (1980)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 259-265 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A statistical distribution of ions M in lattices or partial lattices ∞[A1 - xMxLm] of mixed crystals being assumed, the probability functions PJ(V)(x) for single coordination polyhedra MLn (j = 1), pairs (j = 2) and larger clusters of MLn groups (j 〉 2) in 1D (v = 2) and v-connected 2D systems (v = 3, 4, 6) are calculated. On raising the connecting number v, increasing cluster probabilities are distinctly shifted to lower concentrations x of the foreign ion M. For a relation between the numerical values P(x) and experimental results, the mixed-crystal series (BaF)2[Zn1 - xCuxF4] of a four-connected 2D structure is given as an illustrative example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739480000514
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  • 3
    Electronic Resource
    Electronic Resource
    Isothiocyanat-Komplexe von Kupfer (II) mit quadratisch-planarer und tetragonal-pyramidaler Koordination: Struktur, Phasenumwandlungen und RedoxverhaltenHerrn Professor K. Dehnicke Zum 60. Geburtstage gewidmet (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 608 (1992), S. 88-99 
    Details
    ISSN: 0044-2313
    Keywords: Copper(II) isothiocyanate complexes ; Structure ; EPR Spectra ; phase transitions ; redox properties ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Isothiocyanate Complexes of Copper(II) with Square-Planar and Tetragonal-Pyramidal Coordination: Structure, Phase Transitions, and Redox-PropertiesIn dependence on the kind and size of the counter-cations Cu2+-ions form isothiocyanate complexes with different coordination number and geometry. The structures of compounds with square-planar coordination [(NEt4)2[Cu(NCS)4] · CHCl3 (brown): Space group 14/mmm, Z = 2; a = 1204.3(2) pm, c = 1154.2(3) pm] and with tetragonal-pyramidal polyhedra [(NEt4)3[Cu(NCS)5] · SM (green, SM: unidentified solvent molecule): Space group P21/c, Z = 4; a = 1154.2(6) pm, b = 2291.6(10) pm, c = 1739.9(9) pm, ß = 95.98(5)°] are reported. The green complex transforms into a brown compound at room-temperature; the transformation is (partly) reversibly. Solutions of NCS-anions and Cu2+ are redox unstable. The structure of a resulting product: (PPh4)2[Cu2(NCS)2] [Space group C2/c, Z = 4; a = 1235.4(1) pm, b = 1347.1(2) pm, c = 2953.4(11) pm, ß = 99.36(2)°] with Cu(I) dimers and two bridging NCS- ligands is also reported.
    Notes: Cu2+-Ionen bilden in Abhängigkeit von der Art und Größe des Gegenkations Isothiocyanant-Komplexe verschiedener Koordinationszahl und Geometrie. Es wird über die Struktur von Verbindungen mit quadratisch-planarer Koordination [(NEt4)2[Cu(NCS)4] · CHCl3 (braun): Raumgruppe 14/mmm, Z = 2; a = 1204,3(2) pm, c = 1154,3(3) pm] und mit tetragonalpyramidalen Polyedern [(NEt4)3[Cu(NCS)5] · LM (grün; LM: nicht eindeutig identifizierbare Lösungsmittel-Moleküle): Raumgruppe P21/c, Z = 4; a = 1154,2(6) pm, b = 2291,6(10) pm, c = 1739,9(9) pm, ß = 95,98(5)°] berichtet. Die grüne Verbindung wandelt sich bei Raumtemperatur in eine braune Form um; die Umwandlung ist (partiell) reversibel. Lösungen, die NCS-b- und Cu2+- Ionen enthalten, sind redoxinstabil. Die Struktur eines farblosen Folgeprodukts: (PPH4)2[Cu2(NCS)4] [Raumgruppe C2/c, Z = 4; a = 1235,4(1) pm, b =1347,1(2) pm, c = 2953,4(11)pm, ß = 99,36(2)°] mit dimeren Kupfer(I)-Einheiten und zwei über N- und S-Ligatoratome gebundenen, verbrückenden Thiocyanationen wird beschrieben.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926080214
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der polymeren Achtringstruktur des Kupfer(II)-dichlorophosphatsProfessor Rolf Appel zum 60. Geburtstage am 25. Februar 1981 gewidmet (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 473 (1981), S. 42-50 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Note on the polymeric 8-ring structure of copper(II) dichlorophosphateAccording to the vibrational spectrum, the Cu atoms in Cu(O2PCl2)2 are linked to a polymeric 8-ring structure by O—P—O bridges resulting in a square planar coordination of Cu2+. From the EPR spectrum a canting angle 2γ≃ 104° between adjacent CuO4 planes can be deduced as an additional information. The EPR powder data are discussed with respect to an alternative structural model: 2γ may be located either within each polymeric Cu(II) complex resulting in a strongly corrugated chain structure, or all CuO4 planes of a chain may run parallel; 2γ then ought to be the angle between the CuO4 planes of different chains.
    Notes: Dem schwingungsspektroskopischen Befund entsprechend sind die Cu-Atome im Cu(O2PCl2)2 über O—P—O-Brücken zu einer polymeren Achtringstruktur verknüpft und quadratisch planar mit O-Atomen koordiniert. Aus dem EPR-Spektrum ergibt sich als zusützliche Information ein Verkantungswinkel 2γ ≃ 104° zwischen benachbarten CuO4-Quadraten. Auf Grund der EPR-Pulver-Daten werden zwei Strukturvorschläge diskutiert: Wird der Winkel 2γ von den über P verbrückten CuO4-Komplexen gebildet, so resultiert eine stark gewellte Kettenstruktur; sind die betreffenden CuO4-Komplexe jedoch in ein und derselben Ebene angeordnet, so muß der Winkel 2γ von den CuO4-Quadraten benachbarter Ketten gebildet werden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814730205
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  • 5
    Electronic Resource
    Electronic Resource
    Coordination geometries and cooperative ordering effects in copper(II) complexes with tridentate Schiff base dianions. I. Crystal and molecular structure and EPR investigation of N-salicylideneglycinato-2-methylimidazole-copper(II)Professor Dirk Reinen zum 60. Geburtstage am 5. Mai 1990 gewidmet (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 583 (1990), S. 55-66 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Koordinationsgeometrien und kooperative Ordnungseffekte in Kupfer(II)-Komplexen mit Dianionen von dreizähnigen Schiffschen Basen. I. Kristall- und Molekülstruktur sowie EPR-Untersuchung von N-Salicylidenglycinato-2-Methylimidazol-Kupfer(II)N-Salicylidenglycinato-2-Methylimidazol-Kupfer(II)  -  [Cu(salgly)(2-MeIm)]  -  C13H13N3O3Cu  -  kristallisiert monoklin, Raumgruppe P21/c, a = 1 248,4, b = 1 157,3, c = 964,5 pm, β = 108,91°, Z = 4; Strukturbestimmung mit 1 504 beobachteten Reflexen, R = 5,8%. In der Molekülstruktur des Komplexes sind die CuII-Ionen von den O,N,O-Atomen des dreizähnigen salgly2⊖-Liganden und dem 3-N-Atom von 2-MeIm annähernd quadratisch umgeben. Die Koordinationspolyeder werden jeweils durch ein apikal koordiniertes O-Atom (Bindungsabstand 248 pm) der Carboxylgruppe eines Nachbarkomplexes zu quadratischen Pyramiden ergänzt, die in der Kristallstruktur parallel ausgerichtete Zickzackketten bilden. Die EPR-Parameter der Titelverbindung (g1c = 2,176, g2c = 2,146, g3c = 2.056) liefern eine quantitative Bestätigung für die leicht gestört antiferrodistortive Ordnung der Komplexmoleküle. Vom kooperativen gc-Tensor eines Einkristalls wurden aufgrund der Strukturdaten orthorhombische molekulare g-Komponenten erhalten. Sie wurden verfeinert, um eine noch bessere Übereinstimmung mit den EPR-Parametern einer Reihe vergleichbarer Kupfer(II)-Komplexe zu erzielen.
    Notes: N-Salicyclideneglycinato(2-methylimidazole)copper (II)  -  [Cu(salgly)(2-MeIm)]  -  C13H13N3O3Cu  -  crystallizes in the monoclinic space group P21/c, a = 1 248.4, b = 1 157.3, c = 964.5 pm, β = 108.91°, Z = 4; structure determination with 1 504 significant reflections, R = 0.058. The molecular stucture of the complex is characterized by an approximately square coordination of CuII with O, N, O atoms of the tridendate dianion salgly2⊖ and the 3-N atom of 2-MeIm. The coordination polyhedron is completed to square pyramid by an apically coordinated carboxyl oxygen atom (bond distance 248 pm) from the neighboring complex molecule, thus forming zigzag chains oriented on parallel lines in the crystal structure. The EPR parameters of the title compound (g1c = 2.176, g2c = 2.146, g3c = 2.056) confirm the slightly disturbed antiferrodistortive ordering of the complex molecules quantitatively. From the cooperative gc tensor of a single crystal and the structural data orthorhombic molecular g components were evaluated. They were refined, in order to achieve a still better agreement with the EPR parameters of a series of comparable copper(II) complexes.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905830108
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