The two-electron reductions of various porphyrin complexes Ru-VI(O)(2)(P) by Fe(II), Cr(II), and Mn(II) compounds of porphyrins and salicylaldimines result in the formation of heterotrimetallic ore-bridged complexes (L)M(III)-ORuIV(P)OM(III)(L) (M = Fe(III), Cr(III), Mn(III); P is the dianion of 5,10,15,20-tetraarylporphyrins, such as tetraphenylporphyrin (TPP), tetrakis(p-methoxyphenyl)porphyrin (TMP), or 2,3,7,8,12,13,17,18-octaethylporphyrin (OEP); L is TPP, TMP, or OEP or the dianions of N,N’-(4-methyl-4-azaheptane-1,7-diyl)bis(salicylaldimine) (salmah) or N,N’-ethane-1,2-diylbis(salicylaldimine) (salen). A detailed study of the temperature- and field-dependent magnetic properties of this rather novel series of (L)M(III)ORu(IV)(P)OM(III)(L) compounds has been made. The spin-states of the constituent metal centers are as follows : Ru-IV, S-Ru = 1 (d(4)); Fe-III S-Fe = 5/2 (d(5)); Cr-III, S-Cr = 3/2 (d(3)); Mn-III, S-Mn = 4/2 (d(4)). The spin-state and coordination geometry of the (L)Fe-III groups were confirmed by Mossbauer spectral measurements.