SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF THE TRINUCLEAR MIXED-VALENCE COMPLEX [((TIPTACN)MOVO(MU-O)2)2MOIV(BPY)](PF6)2.0.25CH3NO2 (TIPTACN = 1,4,7-TRIS(2-PROPYL)-1,4,7-TRIAZACYCLONONANE)

Reaction of (tiptacn)Mo(III)Cl3 with 2,2'-bipyridine in aqueous methanol in the presence of air yields after addition of NaPF6 deep red crystals of [{(tiptacn)Mo(V)O(mu-O)2}2 Mo(IV) (bpy)](PF6)2.0.25CH3NO2 (1) where tiptacn represents the tridentate amine 1,4,7-tris(2-propyl)-1,4,7-triazacyclononane. Results of the structure determination on 1 [monoclinic space group C2/c, a = 15.158(7) angstrom, b = 22.135(8) angstrom, c = 20.04(1) angstrom, beta = 109.84(4)-degrees, V = 6324.8(15) angstrom3, Z = 4] have shown that the cation is trinuclear with two terminal (tiptacn)Mo(V)O(mu-O)2 units and a central Mo(IV)(bpy)unit. Two short Mo(V)-Mo(IV) distances at 2.581(2)angstrom are typical for Mo-Mo single bonds. 1 is diamagnetic.