[Na-15-Krone-5] [ReF2Cl2(NO)2]; Synthese, IR-Spektrum und Kristallstruktur / [Na-15-Crown-5][ReF2Cl2(NO)2]; Synthesis, IR Spectrum, and Crystal Structure
Open Access
- 1 November 1989
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 44 (11) , 1393-1396
- https://doi.org/10.1515/znb-1989-1112
Abstract
[Na-15-crown-5][ReF2Cl2(NO)2] has been prepared by the reaction of ReCl3(NO)2 with sodium fluoride in acetonitrile suspension in the presence of 15-crown-5. It forms green, slightly moisture sensitive crystals, which were characterized by IR spectroscopy as well as by an X-ray structure determination. Space group P21/c, Z = 4, 4821 observed unique reflexions, R = 0.040. Lattice dimensions at —60 °C: a = 1024.6(7), b = 801.4(4), c = 2386.6(12) pm; β = 99.90(4)°. The compound forms ion pairs via two Na—F contacts with bond lengths of 239.8 and 233.4 pm. Thus the sodium ion is seven-coordinate by the five oxygen atoms of the crown ether molecule and by two fluorine ligands of the [ReF2Cl2(NO)2]- unit. The nitrosyl groups of the anion are in transposition to the fluorine atoms and in cis-position to one another (symmetry C2v).Keywords
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