SEARCH Articles Figures Tables V indicates which organopentacyanides can and cannot be prepared and which are unstable. The inability to observe any given complex may, of course, be due to the nonformation of that complex rather than to its rapid decomposition but, in view of the isolation of several unstable complexes, it seems reasonable to accept the inability to isolate a complex as circumstantial evidence for its instability. Examination of the data in Table V shows that instability may be enhanced by increasing either or elimination of CoH. [Publishers Imprint] [Publishers Imprint] [Publishers Imprint] [Publishers Imprint] [Publishers Imprint]