Trigonal bipyramid tetranuclear complexes

Similar complexes have been prepared with nitrogen as a central hereroatom but to date only the tetranuclear and pentanuclear derivatives have been achieved from the reaction of ammonia with the oxonium complexes (Figure 1.37), with a tetrahedral or trigonal bipyramidal geometry, respectively [232]. Auration of polyamines or related... 

In the supramolecular assembly of the tetranuclear complex, 149, bis-(dicyclohexylammonium) tris(malonato)tetrakis(tributylstannate), 2[Cy2NH2] -[ Bu3SnOOCCH2COOSnBu3 Bu3SnOOCCH2COO 2]-2EtOH all four tin atoms are five-coordinate (trigonal bipyramidal) and the bis(tributyltin) unit bridges two mono(tributyltin)units. The structure also contains hydrogen-bonds to the cations and Sn <— O bonds from the terminal ethanol molecules [455],... 

The tetranuclear mixed ligand complex [Zr2Co2(/r,3-OPr")2(Ai-OPr")4(OPr")4(acac)2] contains distorted octahedral Zr(iv) and trigonal bipyramidal Co(ii). It is a centrosym-metrical molecule containing an edge-shared bi-octahedral [Zr2(/u.-OR)2(OR)8] unit that incorporates two Co (acac) moieties, which are bridged by one /rs-OR and two fi-OR groups above and below the Zr2(/r-OR)2 plane. ... 

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