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X-ray photoelectron spectroscopy (XPS) was used to characterize the copper ion of 1 ,10-phenanthroline (phen) complexes in the interlayer space of natural montmorillonite and artificial saponite . [Cu(phen)2]2+ and [Cu(phen)3]2+ were intercalated into the minerals instead of ion-exchangeable cations occupying the original interlayer space . Loading amount of complex can be varied up to 170% of cation exchange capacity (CEC) of each clay minerals . Cu(II) 2p photopeakes of [Cu(phen)2]2+ anddoi:10.2116/analsci.13.supplement_355 fatcat:zt5fa4vq3felhiegxwth6yvwiy