Heterotrimetallic coordination polymers

FIGURE 18. Perspective view of the heterotrimetallic chain in [(LCu(CH30H) (H20)Mn Ni(CN)4 ] (H20)(CH3CN). 

A [Cu Co Ni ] coordination polymer, [ LCu(CH30H)(H20)Mn Ni(CN)4 ] (H20)(CH3CN), which consists of linear zigzag chains constructed from LCuMn nodes connected by [Ni(CN)4] spacers (Fig. 18) has been obtained. The [Ni(CN)4] ions interact only with the manganese(II) ions from two nodes through two trans CN groups. 

Flexible Ligands Approach Polycarboxylates as Anionic Linkers. A Case Stndy—Malonato Complexes 

Several recent reviews have projected about the gigantic rise in the number of publications about coordination polymers per year since 1990. In the majority of coordination polymers, either the O-atoms of anions (carboxylates, nitrates, sulfates, phosphates, phenolates) and/or the N-atoms of cyanates, cyanides, amines, pyridines engage in coordination bonds with transition-metal atoms (Tr and Tr-N)- A Cambridge structural database (CSD) search indicates that the coordination polymers propagated by Tr O (7074 hits) are the major portion compared to those of Tr-N (6392 hits). In about 53% of the Tr-O type, the O-atom belongs to carboxylates, whereas in about 40% of the Tr-N kind, the N-atom belongs to pyridine.These statistics indicate the importance of carboxylate and pyridine moieties in generating coordination polymers. 

The simple rod-like exo-bidentate organic ligands such as 4,4 -bipyridil, as we have seen, have the single greatest influence in determining the type and topology of the product. These spacers serve to link metal sites and to propagate structural information as expressed in the metal coordination 

---

Kou, H., Zhou, B., and Wang, R. (2003) Heterotrimetallic 4f—3d coordination polymers synthesis, crystal structure, and magnetic properties. Inorganic Chemistry, 42, 7658—7665. 

---