New Access to Nano[Mn]-Pyranopyrazole[2,3-c]dichloride Series As a Nano-Structured Schiff-Base Complex

A series of novel nano-structured manganese pyranopyrazole Schiff base complex (3a-l) has been synthesized and described. This synthetic complexation involved sequential reactions of domino four-component one-pot reaction for the template of pyranopyrazole (1), imination reaction (2) and finally completed by the complexation reaction with manganese to furnish the title compounds (3a-l). The salient of this nano-Schiff base synthetic reaction protocol is that diverse chemical functionalities were successfully incorporated, simple reaction protocol, and easy workup procedure to yield the title compounds from reasonable to moderate yield. All synthesized compounds were characterized by means of NMR, FTIR, EDX, and elemental analyzer, and by comparing the acquired spectra with the literature precedent for different manganese complexes. These findings revealed that the pyranopyrazole derivatives were successfully complexed with manganese to generate nano-Mn-Schiff base compounds. Further complexation of these derivatives generated 12 novel types of the title compounds (3a-l), which can then be subjected for future chemical applications.