International Journal of Organic Chemistry, 2018, 8, 309-318 http://www.scirp.org/journal/ijoc ISSN Online: 2161-4695 ISSN Print: 2161-4687 DOI: 10.4236/ijoc.2018.83023 Aug. 20, 2018 309 International Journal of Organic Chemistry Green Synthesis of New Tetra Schiff Bases and Bis-Azo Bis-Schiff Bases Derived from 2,6-Diaminopyridine as Promising Photosensitizers Nihad I. Taha, Nashwan O. Tapabashi, Marwa N. El-Subeyhi Department of Chemistry, College of Science, University of Kirkuk, Kirkuk, Iraq Abstract 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 pre- pared 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 organ- ic solvents to achieve the same efficiency in synthesis. The prepared com- pounds which are believed by us to be competent as photosensitizers in pho- tochemical systems were identified by IR and NMR spectroscopy besides elemental analysis. Keywords Schiff Base, Azo-Schiff Base, 2,6-Diaminopyridine, Azo-Salicyladehyde, Photosensitizer 1. Introduction Schiff bases, by containing the azomethine group (C=N) as the central structural form, have been the subject of prevalent research in the various fields of indus- try, pharmaceuticals and the synthesis of biologically active organic compounds [1] [2] [3] [4]; besides corrosion inhibitors [5]. Recently Schiff bases became an important class of ligands in coordination chemistry [6]; Metal complexes the- How to cite this paper: Taha, N.I., Tapa- bashi, N.O. and El-Subeyhi, M.N. (2018) Green Synthesis of New Tetra Schiff Bases and Bis-Azo Bis-Schiff Bases Derived from 2,6-Diaminopyridine as Promising Photo- sensitizers. International Journal of Organ- ic Chemistry, 8, 309-318. https://doi.org/10.4236/ijoc.2018.83023 Received: June 21, 2018 Accepted: August 17, 2018 Published: August 20, 2018 Copyright © 2018 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access