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Einige neue kristallisierte 7.7.8.8-Tetracyanochinondimethan(TCNQ)-Verbindungen mit Tetramminplatin(II)-Dikationen als Gegenionen. : Some New Crystalline 7,7,8,8-Tetracyanoquinodimethane (TCNQ) Compounds with Tetrammineplatinum(II) Dications as Counter Ions

Author:
Endres, H., Keller, H. J., Moroni, W., Nöthe, D.
Source:
Zeitschrift für Naturforschung 2014 v.31 no.10 pp. 1322-1325
ISSN:
0932-0776
Subject:
ammonia, ferrimagnetic materials, ligands, nitrogen, pellets, stoichiometry, temperature
Abstract:
New compounds of stoichiometry [Pt(II)L₂](TCNQ)₂, [Pt(II)L₂](TCNQ)₃ and [Pt(II)L₂](TCNQ)₄ (with L = one bidentate or two monodentate neutral nitrogen donor ligands like ethylenediamine (en), 1,10-phenanthroline (phen) or ammonia) have been prepared and characterized. The complexes of stoichiometry [Pt(II)L₂](TCNQ)₂ with only negatively charged TCNQ- units have relatively low conductivities (in the range of 10⁻⁷—10⁻⁸ Ω⁻¹ cm⁻¹) while the compounds [Pt(II)L₂](TCNQ)₃ containing one neutral TCNQ molecule per formula unit (“complex TCNQ-salts”) conduct much better (in the range of 10⁻²—10⁻³ [Ω⁻¹ · cm⁻¹] for pellets). Most of them show appreciable deviations from a Curie law behaviour. A sharp transition from an antiferromagnetic low temperature to a paramagnetic high temperature modification can be observed for [Pt(II)dipy₂](TCNQ)₂ (dipy = 2,2′-dipyridyl) at 87°C.
Agid:
5214748