لخّصلي

It is widely accepted that it is possible to use FT-IR for probing the absence or presence of the IR active functional groups in an MOF.Hence, upon the exposure of a molecule to the radiations generated by thermal emission of a hot source (e.g., IR energy), it is absorbed merely at the frequencies relative to its molecular mode of vibration in an area of electromagnetic spectra between the short waves (micro-waves) and visible (red); therefore, variations in the vibrational motion result in the bands in the vibrational spectra so that all of them would be characterized by amplitude and its frequency [68,69].Due to the instability of several MOFs against mechanical stress, the sample must be ground carefully.

It is widely accepted that it is possible to use FT-IR for probing the absence or presence of the IR active functional groups in an MOF. Upon the availability of a specific sample holder, we can obtain more complicated data such as the MOFs’ behavior in the presence of gases such as CO2 and CO or at different temperatures. Moreover, a simple operation of FT-IR could be obtained on the powdered specimens of an MOF, or dilution of the specimens could be obtained in matrix-like potassium bromide (KBr). A method for the samples’ dilution is the physical mixing of the MOFs with KBr with a pestle and mortar. Due to the instability of several MOFs against mechanical stress, the sample must be ground carefully. According to the suggested approach, infra-red radiation from an infrared source is used for irradiating the samples, and thus vibrational motions are stimulated by absorbing this radiation via deposition of quanta of energy into the vibrational states. Hence, upon the exposure of a molecule to the radiations generated by thermal emission of a hot source (e.g., IR energy), it is absorbed merely at the frequencies relative to its molecular mode of vibration in an area of electromagnetic spectra between the short waves (micro-waves) and visible (red); therefore, variations in the vibrational motion result in the bands in the vibrational spectra so that all of them would be characterized by amplitude and its frequency [68,69].