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We show that the magnetic state of individual manganese phthalocyanine (MnPc) molecules on a Bi(110) surface is modified when the Mn2+ center coordinates to CO molecules adsorbed on top. Using scanning tunneling spectroscopy we identified this change in magnetic properties from the broadening of a Kondo-related zero-bias anomaly when the CO-MnPc complex is formed. The original magnetic state can be recovered by selective desorption of individual CO molecules. First principles calculations show that the CO molecule reduces the spin of the adsorbed MnPc fromS= 1 to S= 1/2 and strongly modifies the respective screening channels, driving a transition from an underscreened Kondo state to a state of mixed valenceWe thank K. J. Franke, B.W. Heinrich, and D. Jacob for fruitful discussions. This research was supported by Deutsche Forschungsgemeinschaft (DFG-STR 1151/1-1 and SFB 658) and by MICINN under Grants No. FIS2010-21883 and No. CONSOLIDER CSD2007- 0010. M. S. acknowledges computational support from the CCC of the Universidad Autónoma de Madri

Reversible Change of the Spin State in a Manganese Phthalocyanine by Coordination of CO Molecule