| Abstract [eng] |
Four fluorescent minerals from the Phyllosilicates family were prepared and modified with organic chromophores in order to change their fluorescent behaviours. The incorporation of organic perylene-3,4,9,10-tetracarboxylic dianhydride (PBA) during the crystallization of the minerals by one-pot hydrothermal synthesis was attempted. All the minerals and their corresponding hybrids were analysed by SEM, PXRD, ATR-FTIR, UV-Vis and Fluorescence spectroscopies. Gyrolite and Ni- Hectorites do not allow the incorporation of organic groups on their structures. As indicated by XRD, their crystalline structures can not be obtained under the conditions here investigated. On the other hand, Ni-Phyllosilicate and Zn-Phlogopite are good candidates to incorporate organic guest in their interlayered spaces. Thus, aminopropyl-modified Ni-Phyllosilicates and Zn-Phlogopites were prepared using TEOS and APTS as silica sources in different ratios (5, 10, 25 and 50% of APTS) and were obtained with good crystallinity. In a second set of experiment, the aminopropyl-modified minerals were prepared in the presence of PBA and the inorganic phases were obtained satisfactory. However, the presence of imide modes could not be observed by the techniques employed. Fluorescence results show that the presence of PBA change the materials’ interaction with light. Particularly, aminopropyl-modified PBI@Zn-phlogopite (10% APTS) shows the highest emission, at 484 nm. |
