Schiff base triphenylphosphine palladium (II) complexes: Synthesis, structural elucidation, electrochemical and biological evaluation

Muhammad, Shabbir; Akhter, Zareen; Ahmad, Iqbal; Ahmed, Safeer; Shafiq, Maryam; Mirza, Bushra; McKee, Vickie; Munawar, Khurram Shahzad; Ashraf, Ahmad Raza

doi:10.1016/j.molstruc.2016.04.003

Cited by 53 publications

(25 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These bands shifted to higher wave numbers at 1301-1261 cm -1 in the complexes, these showed the participation of the oxygen atoms of phenolic groups in coordination with the Ni(II) ions. The free Schiff bases (L1, L2 and L3) exhibited hydroxyl ⱱ(O−H) absorption bands at 3746, 3747 and 3119-2427 cm -1 respectively, these bands were absent in the complexes which further confirmed the deprotonation of the phenolic groups and coordination of oxygen to the Ni(II) ion 8,12,27 . The complexes showed new bands at 3336, 3340 and 3340 cm -1 respectively assigned to ⱱ(N−H) stretching vibrations of ammonia (-NH3) groups, these indicated the presence of -NH3 groups in the complexes 28 .…”

Section: Ft-ir Spectramentioning

confidence: 82%

“…The spectra showed singlet signals at δ 8.92 (L1), 8.89 (L2) and 9.47 ppm (L3) attributed to the azomethine (−HC=N) protons. The aromatic protons appeared as multiplets around δ 8.34-6.70 ppm 8,11,27 . The three protons of the methoxy (-OCH3) groups in 'L2' appeared as a sharp singlet signal at δ 3.71 ppm 29,30 .…”

Section: Nmr Spectramentioning

confidence: 99%

“…Moreover, the coordination of the azomethine nitrogen atoms of the Schiff bases to Ni(II) ion were indicated by the displacements of the chemical shifts of the azomethine hydrogen to upfield region at δ 9.25-8.65 ppm. The aromatic protons appeared as multiplets around δ 8.49-6.30 ppm for the complexes 8,11,27 . The new singlet signals at δ 2.37 and δ 2.25 ppm in the Ni(II) complexes were assigned to the three hydrogen atoms of -NH3 groups 28 .…”

Section: Nmr Spectramentioning

confidence: 99%

“…The 13 C NMR spectrum of NiL1NH3 showed a peak at δ 167.43 ppm which confirmed the presence of azomethine carbon in the complex. The aromatic carbons peaks appeared in the range 162.96-114.75 ppm 8,11,27 . In NiL2NH3 13 C NMR spectrum, the azomethine carbon appeared at 167.38 ppm and the aromatic carbons peaks appeared in the range 156.48-114.77 ppm while the carbon peak for -OCH3 group appeared at δ 55.96 ppm 29,30 .…”

Section: Nmr Spectramentioning

confidence: 99%

See 3 more Smart Citations

Synthesis, spectroscopic, biological activities and DFT calculations of nickel(II) mixed-ligand complexes of tridentate Schiff bases

Demehin¹,

Oladipo

Semire

2020

Eclet. Quim. J.

View full text Add to dashboard Cite

Ni(II) mixed-ligand complexes of [NiLNH3] (where L= N-salicylidene-o-aminophenol (L1), N-(5-methoxysalicylidene-o-aminophenol) (L2) and N-(2-hydroxy-1-naphthalidene)-o-aminophenol) (L3) containing ONO tridentate Schiff bases and ammonia were synthesized and characterized by elemental analysis, infrared, ultraviolet-visible, proton and carbon-13 spectroscopies. Theoretical calculations were also performed on the optimized structures of the Ni(II) mixed-ligand complexes. The Infrared and ultraviolet-visible spectra of the complexes were calculated, and the results compared with the corresponding experimental spectra to augment the experimental structural identification. The elemental analysis data confirmed the formation of 1:1:1 [metal: Schiff base: ammonia] molar ratio. The NMR spectra showed that the Schiff bases coordinated to the Ni(II) ion via the two deprotonated phenolic oxygen and azomethine nitrogen atoms. The biological studies showed that the complexes exhibited higher antibacterial and antioxidant activities than the free Schiff base ligands.

show abstract

Section: Ft-ir Spectramentioning

confidence: 82%

Section: Nmr Spectramentioning

confidence: 99%

Section: Nmr Spectramentioning

confidence: 99%

Section: Nmr Spectramentioning

confidence: 99%

See 2 more Smart Citations

Synthesis, spectroscopic, biological activities and DFT calculations of nickel(II) mixed-ligand complexes of tridentate Schiff bases

Demehin¹,

Oladipo

Semire

2020

Eclet. Quim. J.

View full text Add to dashboard Cite

show abstract

“…The shifting of azomethine stretching frequency to a lower wave number may be taken as an evidence for the coordination of the nitrogen atom to the metal. In the FT‐IR spectra of complexes, the vanishing of ν OH peak and appearance of peaks in the range of 531–532 and 499–508 cm −1 assignable to ν Pd–O and ν Pd–N, respectively, support the formation of the complexes …”

Section: Resultsmentioning

confidence: 99%

Carbonylative Suzuki coupling reactions catalyzed by ONO pincer–type Pd(II) complexes using chloroform as a carbon monoxide surrogate

Layek

Agrahari

Ganguly

et al. 2020

Applied Organom Chemis

View full text Add to dashboard Cite

Benzoylhydrazone Schiff base–ligated three new ONO pincer–type palladium(II) complexes, [(PdL1(PPh3)] (1), [(PdL2(PPh3)] (2), and [(PdL3(PPh3)] (3), were synthesized by the reaction of the respective ligand, N‐(2‐hydroxybenzylidene)benzohydrazide (HL1), N‐(2‐hydroxy‐3‐methoxybenzylidene)benzohydrazide (HL2), or N‐(5‐bromo‐2‐hydroxybenzylidene) benzohydrazide (HL3), with Pd(OAc)2 and PPh3 in methanol and isolated as air‐stable reddish‐orange crystalline solids in high yields (78%–83%). All three complexes were fully characterized by elemental analysis, Fourier‐transform infrared spectroscopy, UV–Visible, 1H nuclear magnetic resonance (NMR), 13C{1H} NMR, and 31P{1H} NMR spectroscopic studies. The molecular structure of all three complexes was established unambiguously by single‐crystal X‐ray diffraction studies which revealed a distorted square planar geometry of all three complexes. The ONO pincer–type ligands occupied three coordination sites at the palladium, while the fourth site is occupied by the monodentate triphenylphosphine ligand. The catalytic potential of all three complexes was explored in the carbonylative Suzuki coupling of aryl bromides and iodides with arylboronic acids to yield biaryl ketones, using CHCl3 as the source of carbonyl. The reported protocol is convenient and safe as it obviates the use of carbon monoxide (CO) balloons or pressured CO reactors which are otherwise needed for the carbonylation reactions. The methodology has been successfully applied to the synthesis of two antineoplastic drugs, namely, phenstatin and naphthylphenstatin, in good yields (81% and 85%, respectively). Under the optimized reaction conditions, complex 2 exhibited the best catalytic activity in the carbonylative Suzuki couplings. The reported catalysts have wide reaction scope with good functional group tolerance. All catalysts could be retrieved from the reaction after completion and recycled up to three times with insignificant loss in the catalytic activity.

show abstract

Reactions of Schiff Base‐Substituted Diselenides and ‐tellurides with Ni(II), Pd(II) and Pt(II) Phosphine Complexes

2020

View full text Add to dashboard Cite

The salicylidene Schiff bases of bis(2-aminophenyl)diselenide and-ditelluride react with [M II Cl 2 (PPh 3) 2 ] (M = Ni, Pt) or [Pd II (OAc) 2 (PPh 3) 2 ] with formation of square-planar complexes with the general formulae [M II (L Y)(PPh 3)] (M = Ni, Pd, Pt, Y = Se, Te). The ligands coordinate to the metals as tridentate {O,N,Se/Te} chelates. The reduction of the dichalcogenides and the formation of the chalcogenolato ligands occurs in situ by released PPh 3 ligands. A mechanism for such reactions has been [a

show abstract

Schiff base triphenylphosphine palladium (II) complexes: Synthesis, structural elucidation, electrochemical and biological evaluation

Cited by 53 publications

References 42 publications

Synthesis, spectroscopic, biological activities and DFT calculations of nickel(II) mixed-ligand complexes of tridentate Schiff bases

Synthesis, spectroscopic, biological activities and DFT calculations of nickel(II) mixed-ligand complexes of tridentate Schiff bases

Carbonylative Suzuki coupling reactions catalyzed by ONO pincer–type Pd(II) complexes using chloroform as a carbon monoxide surrogate

Reactions of Schiff Base‐Substituted Diselenides and ‐tellurides with Ni(II), Pd(II) and Pt(II) Phosphine Complexes

Contact Info

Product

Resources

About