Mechanical Stimuli Induced Emission Spectra Blue Shift of Two D-A Type Phenothiazine Derivatives

Two D-A type phenothiazine derivatives were successfully designed and synthesized. Their typical solvatochromism was confirmed by spectroscopy. Experimental result also revealed that aggregation-induced emission (AIE) effect may be ascribed to the restriction of intramolecular rotation (RIR). Furthermore, both of them displayed blue-shifted mechanochromic behavior, which is clearly distinguished from their red-shifted precursor aldehyde. This kind of compound has a certain significance in the development and application of organic mechanochromic materials. Hypsochromic MFC template is interesting and of great importance to enrich the MFC library and of great significance for realistic applications. And D-A structure has considerable interest in tunble emission. We reported two D-A type mechanochromic materials by modifying 4-(10H-phenothiazin-10-yl)benzaldehyde with electron acceptors. They present blue-shifted emission after grinding by external force. This indicates that a little modulation on molecule level maybe induced a opposite optical behavior compared with their precursor red-shifted aldehyde.