Molecular chelates, heteronuclear

Another area of considerable interest in polynuclear metal complex chemistry for which the -polyketones seem well suited is that of mixed metal and mixed valence complexes. When one is seeking fundamental data on how the molecular structure and properties of such compounds relate to bulk properties, it is not sufficient to be content with uncertainties concerning purity and the positions of the different ions. In this paper we report on a systematic approach to the preparation of some heteronuclear, molecular chelates, i,e, molecules containing two or more... 

The heteronuclear chelate complex (105) has been prepared and its molecular structure determined. The N202 site is occupied by planar Ni, while the 0202 site is occupied by Zn. Coordinated py completes the five coordination for the zinc. The Zn—O distances average 1.95 A to the terminal oxygens and 2.09 A to the bridging oxygens the zinc is displaced from the least-squares basal plane by 0.32 A towards the py. Cu, UQ2 or VO may be used in place of zinc.764... 

The considerable role of synthetic methods—in particular, direct gas-phase [11,15-18] and electrochemical [11,17,19] techniques—in controlled creation of coordination compounds of various types (molecular and r n-Ti-complexes, chelates, and homo- and heteronuclear compounds) is discussed. Particular attention is given to the complex compounds having standard and nonstandard coordination modes of the most widespread (typical) ligands, for example a(N)- and ji(ri6-C)-complexes... 

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