Synthesis, characterization and preliminaryin vitroantibacterial screening activity of metal complex derivatives of 2-[(5-styryl-[1,3,4]thiadiazol-2-ylimino)-methyl]-phenol

Antimicrobial activity of novel synthesized coumarin based transitional metal complexes

“…In metal Cu(II), Ni(II) Co(II) and Zn(II) complexes of 3a and 3b , the FT/IR absorption band due to the hydroxyl group at 4-HC has been diminished and indicates the metal co-ordination of the OH group via deprotonation due to liberation of hydrochloric acid. In addition to these FT/IR spectral data, stretching of the M−N and M−O bonds of the complexes, which appear in the higher frequency wavenumber region in the range 451–441 and 538–531 cm −1 , also indicates that complexation occurred through nitrogen and oxygen atoms from the azo-enolic ligands 22, 23. The 1 H NMR spectra of ligands 3a and 3b showed the enolic OH peak at 16.81 and 16.86 ppm.…”

Microwave Assisted Synthesis, Solution State, Spectral Studies and Theoretical Treatment of Pd(II) , Pt(IV) and Au(III) ions Complexes Containing 2-Benzamide Benzothiazole

“…However , a few bands have been selected in order to observe of complexation .The most significant vibration bands of free ligand and its metal complexes.The spectrum stretching frequency of ν(N-H) amide at 3290 cm -1 ,another bands exhibits at 1670,1446 and 1253cm -1 which assigned to stretching / bending frequency of amide (I),amide (II) and amide (III) respectively [8].The spectra of metal complexes, the band related the stretching frequency of amide (I) was shifted to the lower frequency in these complex PtL 1 about (~19cm -1 ) and higher frequency in PdL 1 and AuL 1 about (~15-23 cm -1 ).This change indicates that the uncharged amide oxygen participation in the coordination, more evidence a new bands appeared in the spectra of these complexes corresponding to stretching frequency of ν(M-O) band in the range (559-586 cm -1 ) [9,10]. Also the stretching frequency of ν(C=N) was shifted to the lower frequencies about (4-20 cm -1 ) as expected , more evidence new bands displayed in the lower frequencies at (455-493 cm -1 ) which assigned to ν(M-N) bond [9,10], this indicate that this ligand coordinate to the metal ions as a bidenetate ligand through (cyclic N and amide O) atoms [11].The shifting frequencies about (~4-23 cm -1 ) due to stretching frequency of amide (II).The stretching frequency of ν(NH) for all complexes shows some changes in shifting due to the possible hydrogen bonding interaction between (C=O) and (N-H) moiety [12]. The spectra of PdL 1 ; PtL 1 ; and AuL 1 exhibited bands at 3348; 3398 and 3387 cm -1 respectivily referred to presence of ethanol molecules.. Also another weak bands appeared at 311;328 and 325 cm -1 attributed to coordination between metal ions and chloride ions as M-Cl for PdL 1 ; PtL 1 and AuL 1 complexes respectively [12].…”

Microwave Assisted Synthesis, Solution State, Spectral Studies and Theoretical Treatment of Pd(II) , Pt(IV) and Au(III) ions Complexes Containing 2-Benzamide Benzothiazole

“…However , a few bands have been selected in order to observe of complexation .The most significant vibration bands of free ligand and its metal complexes.The spectrum stretching frequency of ν(N-H) amide at 3290 cm -1 ,another bands exhibits at 1670,1446 and 1253cm -1 which assigned to stretching / bending frequency of amide (I),amide (II) and amide (III) respectively [8].The spectra of metal complexes, the band related the stretching frequency of amide (I) was shifted to the lower frequency in these complex PtL 1 about (~19cm -1 ) and higher frequency in PdL 1 and AuL 1 about (~15-23 cm -1 ).This change indicates that the uncharged amide oxygen participation in the coordination, more evidence a new bands appeared in the spectra of these complexes corresponding to stretching frequency of ν(M-O) band in the range (559-586 cm -1 ) [9,10]. Also the stretching frequency of ν(C=N) was shifted to the lower frequencies about (4-20 cm -1 ) as expected , more evidence new bands displayed in the lower frequencies at (455-493 cm -1 ) which assigned to ν(M-N) bond [9,10], this indicate that this ligand coordinate to the metal ions as a bidenetate ligand through (cyclic N and amide O) atoms [11].The shifting frequencies about (~4-23 cm -1 ) due to stretching frequency of amide (II).The stretching frequency of ν(NH) for all complexes shows some changes in shifting due to the possible hydrogen bonding interaction between (C=O) and (N-H) moiety [12]. The spectra of PdL 1 ; PtL 1 ; and AuL 1 exhibited bands at 3348; 3398 and 3387 cm -1 respectivily referred to presence of ethanol molecules.. Also another weak bands appeared at 311;328 and 325 cm -1 attributed to coordination between metal ions and chloride ions as M-Cl for PdL 1 ; PtL 1 and AuL 1 complexes respectively [12].…”