Synthesis and spectral characteristics of silicon-containing poly(salicylidene azomethines) derived from aromatic di- and tetraamines

Diiminic Schiff Bases: An Intriguing Class of Compounds for a Copper‐Nanoparticle‐Induced Fluorescence Study

“…Figure 1 indicates the structures of all the six DSBs. [16] The melting points (see the Supporting Information), 1 H NMR spectra (see Figure S6 in the Supporting Information), and IR spectra (see Synthesis of the CuNPs: DSBs are insoluble in water. So, we dissolved them in an alkaline medium.…”

“…In this case, as effect of ohmic losses on MEF is decreased, less expensive metals such as Al and Cu, which are more lossy than Ag and Au, can be considered as promising candidates for enhancing fluorescence. [15] Salen [16] (the condensation product of salicylaldehyde and diamines) and salen-like molecules in which two imine bonds are separated from each other with an aliphatic or aromatic group have been found to act as a potential fluorophore for many applications. Liu et al [17] reported Mn-salen as a promising probe molecule to detect traces of DNA in solution because of the prominent alteration of the fluorescence property of the molecule.…”

Imine (–CHN–) brings selectivity for silver enhanced fluorescence

“…† To support our proposition in terms of the importance of an iminic bond, several SL based Schiff bases, SBs (where -CHvO is converted to -CHvN) are prepared from SL involving the condensation reaction with different amines (Schiff bases 1SB0, 1SB1, 2SB2, 2SB3, 2SB4, 2SB2A, 2SB3A, 2SB4A, 3SB2A are synthesized using 1N0, 1N1, 2N2, 2N3, 2N4, 2N2A, 2N3A, 2N4A, 3N2 respectively). [20][21][22][23][24] Employment of the preformed SBs ( possessing the iminic bond) in lieu of NSL also speaks of the selectivity towards SEF. Interestingly GEF is not found in these cases as well [Fig.…”