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Synthesis and spectral and structural characterization of a bridging chloropicolinatocopper(II) complex, Cu(C5H4NCOO)Cl

Synthese und spektroskopische und strukturelle Charakterisierung eines verbrückten Chloropicolinatokupfer(II) Komplexes, Cu(C5H4NCOO)Cl

  • Anorganische Und Physikalische Chemie
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Summary

The title complex of copper(II) chloride with picolinic acid was prepared and characterized by spectroscopic and X-ray crystallographic methods. The complex, Cu(C5H4NCOO)Cl, crystallizes tetragonal, space group P42/n (No. 86),a=976.4(1),c=1499.6(4) pm,N=8;R w=0.048 for 543 observed MoKα diffractometer data. In the structure of the complex two μ-chloro bridges form only slightly bent Cu2Cl2 rings [Cu-Cl=224.2(4) and 275.6(4) pm] with Cu...Cu separation of 359.4(2) pm and Cl...Cl separation of 348.7(5) pm. These edge-sharing copper coordination polyhedra are further linked via the N and O donor atoms of the picolinato anions at Cu-N distances of 199.6(12) pm and Cu-O bond lengths of 195.7(8) and 200.6(10) pm, to form a two-dimensional layer structure in which these layers are arranged along theab plane. Each picolinate anion functions as a tetra-dentate ligand: N(1) and O(2) are coordinated to the same Cu(II) center whereas O(1) is bonded to a neighbouring Cu(II) center. O(2) is further bonded to the latter Cu(II) center at a long Cu-O distance of 256.5(8) pm. The electronic, infrared and Raman spectra of the solid complex are reported and discussed.

Zusammenfassung

Der Titelkomplex aus Kupfer(II)chlorid und Picolinsäure wurde dargestellt und mit spektroskopischen und Röntgen-Einkristall-Methoden charakterisiert. Cu(C5H4NCOO)Cl kristallisiert tetragonal, Raumgruppe P42/n (No. 86),a=976.4(1),c=1499.6(4) pm,N=8;R w=0.048 für 543 beobachtete Mokα-Diffraktometerdaten. In der Kristallstruktur bilden zwei μ-chloro-Brücken nur wenig gewinkelte Cu2Cl2-Ringe aus [Cu-Cl=224.2(4) und 275.6(4) pm], mit Cu...Cu Abständen von 359.4(2) pm und Cl...Cl Abständen von 348.7(5) pm. Die kantenverknüpften Koordinationspolyeder der Kupferatome sind in Richtung derab-Ebene über die N- und O-Donoratome der Picolinat-Anionen [mit Cu-N Abständen von 199.6(12) pm und Cu-O Abständen von 195.7(8) und 200.6(10) pm] zu einer zweidimensionalen Schichtstruktur verknüpft. Jedes Picolinat-Anion fungiert als vierzähniger Ligand: N(1) und O(2) sind zum selben Cu(II)-Zentrum gebunden; O(1) ist zum benachbarten Cu(II)-Zentrum koordiniert, zu dem O(2) einen langen Cu-O-Abstand von 256.5(8) pm ausbildet. Die elektronischen, Infrarot- und Raman-Spektren des Festkörper-Komplexes werden berichtet und diskutiert.

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Goher, M.A.S., Hafez, A.K., Abu-Youssef, M.A.M. et al. Synthesis and spectral and structural characterization of a bridging chloropicolinatocopper(II) complex, Cu(C5H4NCOO)Cl. Monatsh Chem 125, 833–840 (1994). https://doi.org/10.1007/BF00812696

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  • DOI: https://doi.org/10.1007/BF00812696

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