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Metal complexes obtained by reacting various 1,2-benzoquinonedioximes with metal salts of Ni(II), Pd(II), Pt(II) and Cu(II) show evidence of considerable metal-metal interactions. In the diamagnetic Pd(II) and Pt(II) derivatives the intermolecular interactions are accomplished by direct metal-metal contacts, which are heavily influenced by different substituents on the 1,2-benzoquinonedioxime (BCDH) moiety as evidenced by their optical behaviour. The unpaired electrons of the paramagnetic copper(II) species interact via ligand atoms in dinuclear clusters or linear chain polymers. The former solids crystallize with stoichiometry [Cu(BCD) 2 ], while the latter compounds have the composition CuCl · BCDH.

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Kristallisierte Koordinationsverbindungen von 1.2-Benzochinondioximen mit den Metall-Ionen Ni(II), Pd(II) und Cu(II): Festkörper mit Metall-Metall-Wechselwirkungen / Crystallized Coordination Compounds of 1,2-Benzoquinonedioximes with the Metal Ions Ni(II), Pd(II) and Pt(II): Solids with Metal-Metal Interactions