Nine new tetra Schiff bases (M 2-M 9) were prepared in moderate yields via the condensation of different aromatic amines and bis-Schiff base (M 1) in microwave synthesizer. Also five new azo-Schiff bases (M 16-M 20) were prepared by the condensation of (M 1) with the azo-salicylaldehyde (M 11-M 15) using the same method. The green synthesis by microwave irradiation was chosen as route due to its novelty, cleanliness, efficiency, time and solvent saving properties compared with the conventional methods which lack these advantages; such as time consume and wasting environment polluting organic solvents to achieve the same efficiency in synthesis. The prepared compounds which are believed by us to be competent as photosensitizers in photochemical systems were identified by IR and NMR spectroscopy besides elemental analysis.
This work contributes to the improvement of the azo group which has outstanding electron donating capability and serves as excellent ligands in the field of coordination chemistry. The authors of this research deal with the microwave irradiation synthesis of some new Schiff bases derived from the biologically effective and photoactive Congo red [Ia-g]. The design and preparation of the structurally reversed analogous compounds to the above compounds [IIIa-d] were accomplished using the conventional chemical methods by keeping the benzidine moiety of Congo red as the nucleus of the synthesized compounds, doubling the number of the azo groups and inverting the way of their conjugation order with the azomethine groups. The structures of the newly prepared compounds were established on the basis of their FTIR and H 1 NMR spectral data.
This work, which can be considered as a complement to our previous studies concerning chemical energy storage systems developing programmed, proposes the synthesis of new azo-Schiff bases derived from 1, 5-diaminoanthraquinone (DAAQ) resulting in an improvement in their absorption spectra. Five new derivatives (An1-An5) were synthesized by gentle fusing of (1 mmol of DAAQ) with (2 mmol) of early prepared azo derivatives of 2hydroxy benzaldyhde. Medium to good yield was recorded on applying this method.Microwave irradiation of the same mixtures led to decomposition of the starting azo materials whereas prolonged reflux in DMSO was unproductive.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.