Heterocyclic Schiff Bases as Main Entity In Methine & Metal Complexes Cyanine Dyes Synthesis

Heterocyclic Schiff bases (1a-g) was prepared and employed in the synthesis of substituted ketomethylene acyclic (cyclic) heterocyclic quaternary iodide salts and acyclic pyrazolo and/or cyclic substituted pyrrolo [5, 4-d] pyrazolin-mero-2 (4), pyrrolo [5, 4-d] pyrazolo-zero-3 [4 (1)]methine and pyrrolo [5, 4-d] pyrazolo or pyrazol [4, 5-d] dioxine (thiazine/ oxazine) metal complex cyanine dyes (2a-d, 3A, B, 4a-d & 5a, b, 6A, B & 7a-c, 8a-c, 11a-d, 12, 13a-d, 14a, b & 17). The new synthesized cyanines and their metal chelator complex dyes were identified by elemental & spectral analyses, The absorption spectra and solvatochromic behaviours of the newly selected synthesised dyes was investigated in pure organic solvents, as well as in aqueous universal buffer solutions.