Characterization of carvacrol@MIL-100(Fe) composite material. Dynamic light scattering and ζpotential measurements were collected in a Zetasizer Ultra (Malvern Panalytical). For transmission electron microscopy a JEM 1010 (JEOL) microscope was employed. X-ray powder diffraction experiments were acquired in an X-ray diffractometer (PANalytical Empyrean) with copper as a radiation source (Cu-Kα, 1.5418 Å). Infrared spectroscopy spectra were registered employing an ALPHA II FTIR spectrometer (Bruker). Thermogravimetric analyses were carried out with TGA 550 (TA Instruments) in high-resolution mode (Ramp: 20.0 °C/min to 680.00 °C; Res 4 Sensitivity 3). N2 adsorption isotherms were obtained using a TRISTAR II apparatus (Micromeritics) at -196 °C. All samples were activated at 100 °C under vacuum for 3h before measurement. Mössbauer spectra were collected using a conventional constant acceleration spectrometer and a 57Co (Rh) source. The velocity scale was calibrated with an α-Fe foil. Low-temperature measurements were performed with the samples immersed in He exchange gas in a bath cryostat. The spectra were fitted to distributions of quadrupole doublets according to the histogram method. Electron paramagnetic resonance spectra were collected with a Bruker ELEXYS E580 spectrometer operating in the X-band (9.47GHz). Sweep width 4960.0 G, time constant 2.56 ms, modulation frequency 100 kHz, modulation width 1 G, microwave power 19.82 mW. EPR spectra were collected with a Bruker ELEXYS E580 spectrometer operating in the X-band (9.47GHz). Sweep width 4960.0 G, time constant 2.56 ms, modulation frequency 100 kHz, modulation width 1 G, microwave power 19.82 mW.