# Can o-phenanthroline be used as a complexing agent for lead(II)?

I’ve been trying to find a method to perform a spectrophotometric analysis to determine lead concentration (on the ppm level). This would require some chelator capable of forming a coloured complex with lead in the aqueous phase.

Fe(II) ion can bind to o-phenanthroline to form an orange colour (with deeper hues based on the present concentration of iron irons). I was wondering if lead(II) can too complex in the same way.

Note: The source of lead is $$\ce{Pb(NO3)2}.$$ This means some nitrate ions will be present in solution after dissociation of this chemical in water.

Figure 1. crystal structure of $$\ce{[(phen)2Pb(NO3)2]}$$ (CCDC: 1246661, CSD: RAQMAX).