Iron clusters, carbidic

Carbide, iron complex, 26 246 Carbido carbonyl ruthenium clusters. 

C, Carbide, iron complex, 26 246 ruthenium cluster complexes, 26 281-284 CHFiO, Acetic acid, trifluoro-, tungsten complex, 26 222... 

The reactivity of surface carbon relevant to Fischer-Tropsch synthesis begins to be understood from the recent works on iron clusters containing coordinatively unsaturated "carbidic" carbon or 2-CH ligands ... 

C, Carbide, iron complex, 26 246 ruthenium cluster complexes, 26381-284 CHF3O3S, Methanesulfonic add, trifluoro-, iridium, manganese, and rhenium com-iriexes, 26 114,115,120 platinum complex, 26 126 CHOS2, Dithioaubonic add, 27 287 CH2> Methylene, osmium complex, 27 206 CH2O2, Formic add, rhenium complex, 26 112... 

The chemistry of iron-group carbides has been extensively studied. Among iron derivatives, the species Fe5(CO)i5C and [Fe6(CO)i6C] are specially relevant. As shown in the sequence of reactions illustrated in Fig. 3.11, these compounds can be prepared from Fe(CO)5 and [Fe(CO)4]. In the same scheme several reactions involving carbido-iron clusters are described. As observed, a number of other encapsulated as well as butterfly species may be prepared from both the hexa and pentairon carbide mentioned above. 

Lines They give the slope of the family of parallel lines belonging to a particular material index (M). Malleable iron It is a type of cast iron with some ductility. It is obtained by heating white cast iron to change its iron carbide to clusters (rossettes) graphite. 

The first carbidocarbonyl transition metal cluster to be recognized was Fe5C(CO),5 (1), which was isolated in very low yield from the reaction of triiron dodecacarbonyl with methylphenylacetylene and characterized by X-ray diffraction by Dahl and co-workers (2). The molecule (Fig. 1) comprises a square pyramidal Fe5 core with the carbide situated. 08 A below the center of a square face. Each iron atom bears three terminal carbonyls. Improved syntheses of 1 by protonation (5) or oxidation of [Fe6C(CO)l6]2-... 

---