Co-7(mu(4)-O)(2)(O2C-CH3)(8)(NCO)(2)(HNPEt3)(4)]center dot 2 OEt2, a seven nuclearity complex with four, five, and sixfold coordinated cobalt atoms [German

摘要

The title compound was prepared from cobalt(II) acetate with Me3SiNPEt3 at 180 degrees C and subsequent crystallization from diethylether to give blue, moisture sensitive single crystals, which were characterized by a crystal structure determination. Space group P2(1), Z = 2, lattice dimensions at -80 degrees C: a = 1544.0(1), b = 1522.1(2), c = 1702.0(1) pm, beta = 103.911(10)degrees, R = 0.0490. [Co-7(mu(4)-O)(2)(O2C-CH3)(8)(NCO)(2) . (HNPEt3)(4)] has a centrosymmetric cluster-like structure in which the octahedrally coordinated central cobalt atom is connected with the remaining six cobalt atoms via two mu(4)-oxygen atoms as well as via four bridging acetato groups to form a Co(Co)(6) octahedral skeleton. Four of the peripheric cobalt atoms have a distorted trigonal-bipyramidal coordination sphere, the other two cobalt atoms are tetrahedrally coordinated. The latter are connected with the nitrogen atoms of the cyanato groups. [References: 13]