Complexes containing phosphorus-donor ligands, [Mo(CO),(PPh,)(pa)] (pa = pyridine-2-carbaldehyde azine), bis(diphenylphosphino)ethane], have been characterised by infrared and electronic spectroscopy, cyclic voltammetry and for the [M02(Co),(p-dppe)(p-p)] complex a single crystal X-ray structure. All of the complexes show strong solvatochromism which has been analysed both by using the empirical parameter E*MLCT and by using McRae's equation. The results are compared with those of their parent complexes [Mo(CO),(pa)] and [Mo,(CO),(p-pa)], and with the results of extended-Hiickel calculations with charge iteration. [Mo2(Co),(PPh3>2(pL-pa)l 9 [Mo2(Co)7(PPh3>(p-pa)l and [Mo2(Co>6(pL-dppe)(C-Pa)l Cdppe = ,2-
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