The reaction of NiCI 2 9 6H20 with Me3CCOOH and KOH taken in a molar ratio of 1 : 2 : 2 in water afforded the nonanuclear anti.ferromagnetic complex [Nig(Me3CCOOH)4(p4-O)3(I~3-OH)3(OOCCMe3)I2], which apparently contains Ni II and Ni III atoms. The complex was isolated by extraction with CH2C12, benzene, or hexane. The reactions of this complex with pyridine bases (pyridine (Py), 3,4-1utidine (Lut), and nicorandil (Nic)) gave the adducts L4Ni2(OOCCMe3)2(~t-OOCCMe3)2(tt-OH) (L = Py, Lut, or Nic, respectively). According to magnetic measurements, intramolecular ferromagnetic exchange interactions in these adducts are complemented by intermoleeular antiferromagnetic interactions. Pyrolysis of the pyridine adduct in air or under an inert atmosphere in xylene yielded the antiferromagnetie complex Py2Ni2(Me3CCOOH)2(OOCCMe3)2(~t-OOCCMe3)2(~.-OH2), which contains Ni 11 atoms. The structures of all the complexes synthesized were established by X-ray diffraction analysis. The electronic absorption spectra of these compounds are considered.

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