Trinuclear complexes of four-coordinate iron and cobalt: Some reflections on the importance of the reaction conditions for the formation of metal-metal bonds
Fa. Cotton et al., Trinuclear complexes of four-coordinate iron and cobalt: Some reflections on the importance of the reaction conditions for the formation of metal-metal bonds, POLYHEDRON, 18(3-4), 1998, pp. 423-428
The mononuclear, tetrahedral iron and cobalt complexes, FeCl2(Hhpp)(2), I,
and CoCl2(Hhpp)(2), II, are readily formed by the reaction of the metal (II
) chloride with Hhpp. Compound II crystallized as blue blocks in the space
group Fdd2. The reaction of I with LiMe yielded the trinuclear complex Fe3C
l2(hpp)(4), III, which crystallized as colorless blocks in the space group
P2(1)/n. A cobalt complex Co3Cl2(hpp)(4), IV, analogous to III, was synthes
ized by the reaction of CoCl2 with Lihpp. Compound IV crystallized as blue
blocks in the space group P2(1). Both III and IV have three four-coordinate
metal centers and contain no metal-metal bonds, two metal atoms are each b
ound to one chlorine and three nitrogen atoms while the third one is bound
to four nitrogen atoms. (C) 1998 Elsevier Science Ltd. All rights reserved.