Single crystals of the title compound are monoclinic, space group P21/n with two formula units per cell of the following dimensions: a = 18.209, b = 19.076, c = 4.075 Å, β = 92.43°. The crystals show metallic conductivity along the needle axis from room temperature down to ca. 180 K, the maximum conductivity at room temperature being 455 (Ω cm)−1.
The unoxidized (iodine free) parent compound crystallizes n the monoclinic space group P21/c with 2 molecules per cell of dimensions: a = 4.988, b = 20.192, c = 11.871 Å, β = 94.41°.
Summary:The position of the asymmctric COO-vibration of lead4+ carboxylatcs (at 6.50 to 6.58 p) clearly indicates the absence of covalent bonding between oxygen and lead. These salts show strong UV. absorption in the region of 220 to 270 nm which is assigned to a charge transfer from oxygen to lead. UV.-irradiation of lead4+ carboxylates at -196°C in a solid benzene matrix leads to decarboxylation and production of alkyl radicals which wcrc identified by ESR. spectrometry. These radicals react in the solid matrix by hydrogen abstraction from the a-position of a neighbouring carboxylate. In solution however rapid oxidation to carbonium ions occurs.
Ausgehend von Tris‐[1,2‐diaminobenzol]‐cobalt(II)‐perchlorat kann man durch sehr vorsichtige Oxygenierung in ethanolischer Lösung zwei verschiedene Intermediärkomplexe isolieren, bei denen es sich um einen high‐spin und einen low‐spin‐Co(II)‐ Komplex mit einem Radikalliganden handelt.
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