A Heck coupling of 4 equiv. of 4-vinylpyridine with 4,4′,4″,4‴-tetrabromotetraphenylmethane or 2,2′,7,7′-tetrabromo-9,9″-spirobifluorene affords the new tetranucleating bridging ligands 4,4′,4″,4‴-tetrakis(4-pyridylethen-2-yl)tetraphenylmethane (L 1) and 2,2′,7,7′-tetrakis (4-prydidylethen-2-yl)-9,9″-spirobifluorene (L 2) respectively, which have unusual geometries. L 1 comprises a tetrahedrally-disposed set of four 4-pyridyl donor groups attached to a tetraphenylmethane core, and L 2 comprises two mutually perpendicular conjugated strands with 4-pyridyl termini, orthogonally fused at a 9,9′-spirobifluorene core. Reaction of these with an excess of [Mo(Tp ∗)(NO)Cl 2] (Tp ∗-tris (3,5-dimethyl-pyrazolyl)hydroborate) afforded the tetranuclear complexes [(CL(NO)(Tp ∗)Mo) 4(L 1)] (1) and [(Cl(NO)(Tp ∗)Mo] 4(L 2)] (2), in which redox-active, paramagnetic [Mo(Tp ∗)(NO)Cl] fragments are attached to the four 4-pyridyl termini of each ligand. The fragments are too far apart for there to be any significant electrochemical interaction between them, but the EPR spectrum of 2 shows that magnetic exchange is occurring between pairs of molybdenum centres, i.e. the electrons at either end of each conjugated strand of L 2 are magnetically coupled, but that there is no significant interaction between the two strands across the spiro-linked bridge. Complex 2 therefore contains two independent, orthogonal magnetic exchange pathways.