Structural relationships between {ZR₆}X₁₂Rand {ZR₆}X₁₀type cluster complexes

Abstract

From the reaction mixtures containing Cu(ClO 4) 2 , bidentate ligands L (L = 1,10-phenanthroline, phen, or 2,2'-bipyridine, bpy) and KC(CN) 3 , pairs of [Cu(phen)(C(CN) 3) 2 ] n (1 and 2) and [Cu(bpy)(C(CN) 3) 2 ] n (3 and 4) complexes have been isolated. The composition of 1 and 2 on the one hand as well as 3 and 4 on the other hand is the same, nevertheless the IR spectra in the ν(C≡N) region of individual pairs of complexes were different and thus indicated different bonding modes of C(CN) 3 anions in individual pairs of complexes. This was definitely confirmed by the X-ray analysis which revealed that the complexes 1 and 2 represent a pair of isomers while 3 and 4 are two polymorphic modifications. The complexes 1