Solvent molecules, cyanide-bridged complexes

When four monodentate ligands, including solvent molecules, are bound to the central metal ion, a trans disposition of the bridging cyanides is the preferred orientation [Fig. 18(c)]. The only exception to this trend is found in the structure of cw- [(pcq)Fe (CN)3l2[Mn (Me0H)2(H20)2] (119) [Fig. 18(kinetic products, given the presence of terminal cyanides or labile solvent molecules in their structures. The availability of these potential coordination sites renders such trinuclear complexes convenient scaffolds for the assembly of higher nuclearity clusters or extended structures (Section V). 

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