Nickel nonporphyrin metal compounds

Unlike metalloporphyrins, the nonporphyrinic metal compounds are poorly characterized with respect to molecular structure and properties. Examining the nature of the nickel and vanadium in these compounds is important from the standpoint that often most of the Ni and V in a petroleum is nonporphyrinic, as shown in Table II. Sugihara et al. (1970) suggested that the nonporphyrin metal compounds comprise a wide variety of coordinated complexes resulting from the reaction of inorganic forms of the metals with polar organic molecules. Larson and Beuther (1966) speculated that the nonporphyrinic metal complexes are simply... 

In Section II, the nature of the metal compounds in petroleum oils is discussed to establish a basic understanding of the targeted reactants. The chemical composition of the host petroleum and residuum is described, including a discussion of the two classes of metal compounds (1) metal-loporphyrins and (2) nonporphyrin metals. The troublesome asphaltenes will also be described. Comparison is made between the characteristics of vanadium and nickel complexes and their distribution in residua. 

Additionally to nickel ICC, chelates of the types 467, 468, 472, and 473, containing either cobalt, iron, copper, palladium, zinc, cadmium, or mercury, have also been obtained [269,270,804]. Special interest amongst them is provoked by copper ICC containing an azomethinic N,S-ligand environment. These compounds are one of the several biomimetic models of nonporphyrine metal proteins [448,804,834]. The majority of these ICC have trimetallocyclic structures of the types shown by struc-... 

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