Cyanide-bridged complexes crystal structures

Chromium, (ri6-benzene)tricarbonyl-stereochemistry nomenclature, 1,131 Chromium complexes, 3,699-948 acetylacetone complex formation, 2,386 exchange reactions, 2,380 amidines, 2,276 bridging ligands, 2,198 chelating ligands, 2,203 anionic oxo halides, 3,944 applications, 6,1014 azo dyes, 6,41 biological effects, 3,947 carbamic acid, 2,450 paddlewheel structure, 2, 451 carboxylic acids, 2,438 trinuclear, 2, 441 carcinogenicity, 3, 947 corroles, 2, 874 crystal structures, 3, 702 cyanides, 3, 703 1,4-diaza-1,3-butadiene, 2,209 1,3-diketones... 

The majority of cyanide-bridged dinuclear complexes described for the combination of metal ions belong to the biologically relevant class of Cu —Fe dimers. These compounds serve as models for the binuclear cyanide-inhibited site of cytochrome c oxidase, an enzyme that contains the heme-copper active site responsible for the O2 reduction chemistry (59). The lethal toxicity of cyanide was traced to its irreversible binding and inhibition of this active site in the enzyme (60). The biologically relevant aspects of these complexes were the subject of many reports (61,62). Our interest is in describing their crystal structure, which will be correlated to the magnetic properties in a later section. 

As mentioned throughout the previous sections, it is important to emphasize the role of electroneutrality in the formation of truncated chains, products that obviously hold potential for a further increase in the nuclearity of the cyanide-bridged core. An excellent illustration of this point is the structure of [Ho (dmQ3(H20)3]2[Ni°(CN)4]3] (189). Earher, we described a large family of complexes composed of rare earth Ln(III) and [M (CN)6] ions (M = Cr, Fe, Co) (Table I). The combination of these ions in a 1 1 ratio results in neutral dimers that readily crystallize from solutions in DMF or DMSO. In contrast, the cluster that... 

Hashimoto and co-workers have prepared a novel cyano-bridged bimetallic complex composed of Sm(H20)5[W(CN)g] (Figure 34), showing, on cooling, rate dependent ferromagnetism. The crystal structure of this compound consists of a two-dimensional cyanide-bridged network. 

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