Coordination numbers solid state 7-block metal complexes

In the remaining part of this section, we give a systematic outline of the occurrence of different coordination numbers and geometries in solid state c/-block metal complexes. A general word of caution molecular formulae can be misleading in terms of coordination number. For example in... 

Lanthanide complexes display a richness of coordination number and geometry unmatched by any other block of metals. It is becoming increasingly clear that in the absence of the strong ligand-field forces that often dictate coordination geometries in transition metal complexes, the coordination number adopted and the species formed in the solid state depends on the balance of a number of factors. 

A simpler but equally effective approach has been employed by Ward and coworkers [25] in the preparation of coordination polymers using luminescent anionic complexes. Here transition metals with emissive MLCT states act as effective sensMsers for lanthanide emission in the NIR [25]. In this case cyanide groups were used as bridging units starting from stable Ru " complexes and simple Ln salts. Examples include [Ru(Bipy)(CN)4] [26,27], [Ru(Phen) (CN)4] - [28], [Ru(Bpym)(CN)4] -, [Ru(CN)4]2([i-Bpym) 4- [29], [Ru(Hat)(CN)4] - [25], [Ru(CN)4]3(p"-Hat) -, [ Ru(CN)4 2([i -Hat)]4-, [Cr(CN)6]"-, and [Co(CN)6] - [30]. The advantage of this method is that the building blocks are already kinetically stable in solution and the solid structure is dictated by the coordination number adopted by the lanthanide ion (Fig. 9.5). 

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