A quest for triple-decker complexes with a bridging phospholyl ligand. Syntheses of [(m,5:5-C4Me4P)(FeCp)(RhCp)](BF4)2 and [(m,5:5-C4Me4P)(FeCp)(IrCp)](BF4)2, and structures of [CpFe (m,1:5-C4Me4P)Ir(NCMe)2Cp](CF3SO3)2(Me2CO) and (C5Me4CH2C6H11)Fe (m,1:5-C4Me4P)Rh(O3SCF3)2Cp