A series of azo naphthalimide dyes were prepared by coupling N,N-diethyl-m-toluidine with three heterocyclic amines as the diazo components. The structures of the nine prepared azo dyes were fully characterized by Fourier transform infrared, differential scanning calorimeter, thin-layer chromatography, proton and carbon nuclear magnetic resonance, mass spec- trometry, elemental analysis (CHNS), and UV–Vis spectroscopic techniques. UV–Vis studies represented that all dyes -1 -1 have molar extinction coefﬁcients between 30,000 and 61,000 M cm and have maximum wavelengths between 545 and 558 nm in DMF solution. The newly synthesized dyes were screened for their potential antimicrobial activities against Gram-positive, Gram-negative bacteria and fungi using the cup plate and broth microdilution methods. The results of antibacterial and antifungal activities exhibited signiﬁcant inhibitory effect against the test microorganisms in vitro. Graphical abstract Keywords Bioinorganic chemistry Dyes Diazo compounds UV–Vis spectroscopy Aromaticity Introduction derivatives a large p-conjugated backbone which is advantageous, have strong hydrophobicity and also can Naphthalimide derivatives, for their signiﬁcant potential in effortlessly cause diverse interactions [5, 7, 8]. As expec- medicinal chemistry [1–3] and material sciences are being ted, these derivatives can better interact with various active keenly investigated [4–6]. The outstanding characteristics targets in biological
Monatshefte für Chemie - Chemical Monthly – Springer Journals
Published: Feb 10, 2018
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