Figs. and). In this case, the most relevant initial drop was observed for n=6 but also for this sample and differently from the iodide analogue, it was possible to measure the sample up to 40 s. The drop for the n=10 composition was less pronounced, but a significant reduction of the contact angle was observed during the measurement. Also in this case, differently with respect to the CnH2n+1NH3)2PbI4 series, the measurement could be performed up to the maximum time interval selected. Finally, for n=16, the value of the contact angle remains constant, around 60°, for the whole measurement, confirming the strong hydrophobicity also for the (C16H33NH3)2BrI4 composition. The contact angle measurements well correlate to the results of the tests reported in Figures , indicating a general improved hydrophobicity by extending the hydrocarbon chain length but also moving from the iodide to the bromide anion.