“…The geometric and cavity control of host-guest complexation and modulation of lipophilicity in SBs provide remarkable selectivity [5], sensitivity and stability for specific ion. Thus, SB have attracted increasing attention for determining rare earth metals such as Gd 3+ [6], Tb 3+ [7], Ce 3+ [8,10], Nd 3+ [9], La 3+ [11], Cr 3+ [12], EU 3+ [13]. The 1,3-diphenylpropane-1,3-diylidenebis(azan-1-ylidene) diphenol (DPDBD) is a newly synthesized Schiff base and is known to form complex with Praseodymium.…”