Nitrido trinuclear

A trinuclear nitrido-bridged osmium complex, [Os3(N)2(CN)io(OH2)4]", has been reported. 

A new class of binuclear nitrido complexes of tetravalent osmium and ruthenium is described in which the metal atoms are symmetrically bridged by a nitride ligand to give a linear M-N—M unit They have the stoichiometries M2NX8(H20)2]3 and [M2N(NH3)8Y2]3+ (M = Os, Ru X = Cl, Br Y = Cl, Br, etc.). Studies are reported on their vibrational spectra, structures, and bonding. Preliminary studies are reported also on trinuclear complexes of osmium and iridium. Finally, the use of vibrational spectroscopy in the study of metal-nitrido and metal-oxo complexes is discussed briefly. 

No mononuclear osmium(IV) nitrido complexes have been established, but /i-nitrido species containing a linear Os—N—Os unit are known, and there are trinuclear species of osmium(IV) and of mixed oxidation state containing Os—N—Os—N—Os units. The existence of both types is predictable from bonding considerations. They are dealt with on p. 564. 

Carbonylferrates have been the subject of many studies. The well-defined mono-, di-, and trinuclear species [FefCO) ", [Fe2(CO)g] , and [Fe3(CO)ii] have been obtained by a variety of methods in varying yields and degrees of convenience. The procedures described here provide uniform, convenient, high-purity, high-yield syntheses of the sodium salts of these three important reagents. In addition, the preparation of the bis [/<-nitrido-bis(triphenylphosphorusXl + )] salt of [Fe3(CO)n] by metathesis of [(Ph3P)2N]Cl with Na2[Fe3(CO)i i] is presented. 

---