Synthesis and spectral studies of heterocyclic azo dye complexes with some transition metals

synthesis and characterization of new imidazole azo ligand with some of transition metal ions, and their biological effect on two pathogenic bacteria of burn patients.

“…Uv-Vis spectrum of free ligand (DPIDA) show up three bands at 284, 257, 238 nm which attributed to (ππ*) transitions of aromatic rings which shifted to higher wavelengths with little changes of values in complexes spectrums , while the bands at 466 nm of (n-π*) transitions that exhibited redshift in the ranges of complexes as a result of charge transfer transitions after coordination as shown in Table 2 . IR spectra of ligand (DPIDA) showed v(N-H) peak of imidazole ring at (3400) cm − (Abbas and Kadhim, 2016)two peeks at (3034) and (3061) cm-due to the vibrations of aromatic v(C-H) , and one peak at (2991) cm-of aliphatic v(C-H) that showed no signi icant changes in the spectra of the complexes frequencies. The peaks at (1588) cm-and (1315) cm-exhibited a stretching of v(C=N) and v(C-N) (Al-Hasani and Almaliky, 2015) respectively of imidazole ring that proceed a changing in position and intensity in complexes which is an indicate the participation of (N3) atom in coordination, also the values of v(N=N) (Jarad et al, 2018); (Slassi et al, 2019b) peak at (1498) cm-shifted to lower values in the complexes that's considered as an evidence on coordination proceed through one nitrogen atom of azo group, new values of v(M-N) frequencies appeared between (543 -511) cm − in the complexes that consider as additional evidence on coordination process as shown inTable 3 andFigures 4, 5 and 6.…”

Synthesis, Spectroscopic characterization and bactericidal valuation of some metal (II) complexes with new Tridentate Heterocyclic Azo Ligand Type (NNO) Donor

“…The huge band of the curves for pH which was reflected as a reference of complex formation and acceptance as finest pH for preparing complexes. Hence, we deduce that all equipped chelate complexes with a selection of metal ions have been prepared in basic medium [20,21].…”

“…The 1 H-NMR spectrum of ligand (PABH) in DMSO-d 6 Figure ( 4) was shows a single peak appeared at δ(10.458) ppm which was attributed to chemical shift of OH proton in the 2-naphthol [13], [20]. A multiplet peak at δ (8.461 -6.884) ppm that have been as a result of chemical shifts of aromatic protons for aromatic rings of 2-naphthol and phenyl moieties [22,23,24].…”

“…A peak at δ (167.13) ppm which is assigned to C=C-OH and a signal at (121.81) duo to C=C-Br carbons in 2-naphthol rings [13]. The peak at δ (163.74) ppm is due to C=C-N site linked of 2naphthol with azo group for pyrazolin ring [20], [27]. The signals at δ (47.34) ppm are assigned to the middle and terminal C-C carbon atoms of diaminobutane moiety in the ligand [12], [25], [27].…”

“…The changing in a color of free ligand solutions and high shift in the (λ max ) offers a worthy sign for coordinating and complex forming [28], [30]. The spectra of complexes depicted added low intensity bands in the perceptible regions associated with ligand field d-d transitions [20], [26]. Co-complex spectrum in ethanol solution in Figure (8), revealed dual bands at (510) nm (19607.84) cm -1 and (095) nm (16949.15) cm -1 , which were attributed to the 4 T1g 4 T1g(p) (3) and 4 T1g 4 A2g (2) transitions correspondingly of octahedral geometrical structure [31], [31].…”