The characterization of a monoclonal antibody (AC1106) elicited via immunization with a Co (dmbpy)(bpy) 23+-methyl viologen hapten (1) is described. AC1106 was found cross- reactive for a variety of luminescent ruthenium (II) metal complexes which served as useful probes to investigate the molecular recognition properties of this antibody. AC1106 was found to be specific for methylated derivatives of Ru (bpy) 32+ and Ru (phen) 32+ in the ...