Fragmentation and aggregation reactions

Another simple rhodium carbonyl complex also known to be Involved In the fragmentation and aggregation reactions of clusters Is Rh2(C0)s This species has been shown to participate In the reactions of neutral rhodium carbonyl species In either matrixes or solutions (equation 4), but It has not yet been Implicated In the chemistry of large anionic clusters. 

We have already observed that simple antonlc, e.g., CRh(C0)4] , and neutral, e.g, HRh(C0)4 or Rh2(C0)s> rhodium complexes could be involved In the fragmentation and aggregation reactions of polynuclear species. In addition, the cationic moiety "Rh(C0)2+" has been found to formally coordinate to [Rh 4(C0)2534- +0 form [Rhi 5(C0)27]3 (equation 8), or to get detached from the latter cluster by halide ligands (equation 9) JJJ under ambient conditions. 

We also examined the fragmentation and aggregation reactions of [Rhi 3(C0)24Hx] 3-n) under high pressures of CO and H2.(3.)... 

These studies have Indicated that simple rhodium carbonyl complexes, e.g., mono- and binuclear species are Involved in the fragmentation and aggregation reactions of rhodium carbonyl clusters under high pressures of carbon monoxide and hydrogen. They indicate that it is possible to write formal equations for such reactions in the case of rhodium carbonyl anionic hydrido clusters (equation 25) and for the more particular situation when there are not hydrides present (equation 26)... 

---