Infrared spectroscopy, provided information first, on the presence of the organic capping in the protected samples and, second, about the chemical stability and perturbations of MnPS 3 after the intercalation/exfoliation process. This last aspect was furtherly supported by Raman spectroscopy (see ESI Fig. ). As can be seen in ESI, Fig. and Fig. , the high energy region of the IR spectra gives evidence of the polymeric capping agents in the composite like the carbonyl vibration in MnPS 3 @PVP and amino vibration in MnPS 3 @PEI. Focusing on the low energy region of the IR spectra Fig. (~800-400 cm -1 range), specific information of the inorganic layers can be extracted. Thus, in MnPS 3 bulk sample it is possible to distinguish two characteristic bands. The first one appears at 445 cm -1 and corresponds to P-P vibration. The second one corresponds to asymmetric stretching ν(PS 3 ) and is centered at 560 cm -1 . An analogous spectrum is recorded for MnPS 3 @H 2 O but a different behaviour is observed for MnPS 3 @PVP and MnPS 3 @PEI. In these last cases, we notice a clear splitting of the asymmetric stretching ν(PS 3 ) band in MnPS 3 @PEI, which is less intense but is also present in MnPS 3 @PVP. A similar splitting of the ν(PS 3 ) band was previously reported by Clément and coworkers 17 in the infrared spectra of MnPS 3 Li + intercalates. This splitting was attributed to the creation of metallic Mn vacancies in the layer since this deffects give rise to inequivalent P-S bonds (because some S atoms are coordinated to Mn centres, while others are not). However, in our systems, XPS measurements confirm that we do not have a high number of Mn defects and that we successfully removed all the intercalated Li + ions (that could compensate Mn vacancies), see ESI Fig. . Therefore, the reason behind the splitting detected in the composites should be the interaction with the polymeric capping layers.