Synthesis, characterization and liquid crystalline properties of novel benzimidazol-8-hydroxyquinoline complexes

Al‐Noor, Taghreed H.; Karam, Nisreen H.; Ghanim, Faeza H.; Kindeel, Alia S.; Al-Dujaili, Ammar H.

doi:10.1016/j.ica.2017.07.029

Cited by 10 publications

(7 citation statements)

References 24 publications

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“…Regarding the 8-HQ, the FTIR spectrum shows peaks at 2981 and 2358 cm –1 , which are associated with N–H stretching of the NH group and C–H stretching vibrations of the ring, respectively . The bands located in the range 1573–1187 cm –1 are related to C–N ring stretching vibrations, in-plane O–H bending, O–H deformation, and C–O stretching . The bands located between 700 and 400 cm –1 are associated with O–H stretching bonds .…”

Section: Resultsmentioning

confidence: 98%

“…42 The bands located in the range 1573−1187 cm −1 are related to C−N ring stretching vibrations, in-plane O−H bending, O−H deformation, and C−O stretching. 43 The bands located between 700 and 400 cm −1 are associated with O−H stretching bonds. 44 Characteristic peaks of the corrosion inhibitors are observed (marked with a dashed circle in Figure 1) on the loaded HNT spectra, which indicates that the nanotubes were successfully loaded.…”

Section: Structural and Compositional Analysis Of Hntsmentioning

confidence: 99%

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Smart Functionalization of Ceramic-Coated AZ31 Magnesium Alloy

Mingo

Guo

Leiva-García

et al. 2020

ACS Appl. Mater. Interfaces

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Providing materials with smart functionalities such as self-healing properties is primarily a domain for organic materials, although their applicability is restricted to mild environments and loads because of poor thermal and mechanical properties. This work seeks to achieve the active functionalities obtained in organic materials but in ceramics, which are much more heat resistant and robust. Ceramic coatings were produced by plasma electrolytic oxidation (PEO), which is an environmentally friendly technique that offers an alternative to potentially carcinogenic treatments used widely in the automotive and aircraft industries to protect light alloys against corrosion. The active functionalization was achieved by incorporating corrosion inhibitors encapsulated into halloysite nanotubes (HNTs) into the PEO coatings. This allowed controlled release of active agents when detecting environmental pH changes associated with the corrosion initiation of the metal substrate. Three corrosion inhibitorsvanadate, molybdate salts, and 8-hydroxyquinoline (8-HQ)were assessed within the PEO–HNT system and demonstrated considerable improvements in the corrosion resistance by decreasing the kinetics of both anodic and cathodic reactions. For immersion times up to 72 h, vanadate offered a consistently higher corrosion resistance, which was followed by molybdate, whereas the positive effect of 8-HQ was time-limited. The improvement in corrosion resistance was associated with the combined enhancement of the barrier and active protection properties of ceramic coatings. All coatings containing corrosion inhibitors were capable of providing self-healing to small scratches, whereas only vanadate could partially restore a more severe damage.

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Section: Resultsmentioning

confidence: 98%

Section: Structural and Compositional Analysis Of Hntsmentioning

confidence: 99%

Smart Functionalization of Ceramic-Coated AZ31 Magnesium Alloy

Mingo

Guo

Leiva-García

et al. 2020

ACS Appl. Mater. Interfaces

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“…Table 2 displays the selective vibrational frequencies of infrared spectra of the synthesized complexes and ligands. The assignments for the observed infrared bands were made primarily based on the vibration modes as calculated (theoretically) and on the literature data [27][28][29][30][31][32]. The infrared spectrum of the free ligand L 1 exhibits a sharp band at 1658 cm −1 , which is assigned to ν(−C=N−).…”

Section: Vibration Frequencies Resultsmentioning

confidence: 99%

Synthesis, DFT Calculations, DNA Interaction, and Antimicrobial Studies of Some Mixed Ligand Complexes of Oxalic Acid and Schiff Base Trimethoprim with Various Metal Ions

Abdalrazaq

Jbarah²,

Al‐Noor³

et al. 2022

Indones. J. Chem.

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Mixed ligand metal complexes are synthesized from oxalic acid with Schiff base, and the Schiff base was obtained from trimethoprim and acetylacetone. The synthesized complexes were of the type [M(L1)(L2)], where the metal, M, is Ni(II), Cu(II), Cr(III), and Zn(II), L1 corresponds to the trimethoprim ((Z)-4-((4-amino-5-(3,4,5-trimethoxybenzyl)pyrimidine-2-yl)imino)pentane-2-one) as the first ligand and L2 represent the oxalate anion ( ) as a second ligand. Characterization of the prepared compounds was performed by elemental analysis, molar conductivity, magnetic measurements, 1H-NMR, 13C-NMR, FT-IR, and Ultraviolet-visible (UV-Vis) spectral studies. The recorded infrared data is reinforced with density functional theory (DFT) calculations. Also, the recorded and calculated IR spectra of the complexes suggested that the coordination of Schiff base is a bidentate ligand with Cu and Ni complexes and a tridentate ligand with Co, Cr, and Zn complexes. The electronic structures of the complexes were investigated by DFT calculations, showing several degrees of HOMO-LUMO energy gaps between complexes. The complexes were studied for their DNA interaction activities. The synthesized ligand and its metal complexes were evaluated for antimicrobial properties against bacterial strains of Bacillus subtilis (G+), Enterobacter cloacae (G-), and Staphylococcus aureus (G+). These complexes considered in this study showed good antimicrobial activity.

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“…Bis (benzimidazole) derivatives containing two benzimidazole and one central pyridine units behave as a tridentate ligand and their complexes with transition metals have been synthesized and their properties were extensively studied . Also, several benzimidazole derivatives have been synthesized and their liquid crystalline properties were studied in detail …”

Section: Introductionmentioning

confidence: 99%

Mn (II) and Zn (II) complexes of a benzimidazole ligand having undecyl chains: Crystal structures, photophysical and thermal properties

Kırpık

Köse

2019

Applied Organom Chemis

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A new tridentate benzimidazole ligand (L-C 11 ) containing undecyl chains and its Mn (II) and Zn (II) complexes were synthesised and characterized by spectroscopic and analytical methods. Molecular structures of complexes [Mn(L-C 11 )Cl 2 ] and [Zn(L-C 11 )Cl 2 ] were evaluated by X-ray diffraction studies. The X-ray data showed metal ions in both complexes are five-coordinate with distorted square pyramidal geometry around the metal centres. The undecyl chains in the structure of the complexes are aligned in an interdigitated manner (head to tail) forming a non-polar domain. The aggregation properties of the ligand and its complexes were investigated by UV-Vis. absorption and emission spectroscopies in DMF-water mixtures. The emission spectral data revealed that the compounds showed aggregation induced quenching (AIQ) in DMF-water solutions. Moreover, thermal properties of the compounds were investigated by TG, DTG and DSC analysis.

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Synthesis, characterization and liquid crystalline properties of novel benzimidazol-8-hydroxyquinoline complexes

Cited by 10 publications

References 24 publications

Smart Functionalization of Ceramic-Coated AZ31 Magnesium Alloy

Smart Functionalization of Ceramic-Coated AZ31 Magnesium Alloy

Synthesis, DFT Calculations, DNA Interaction, and Antimicrobial Studies of Some Mixed Ligand Complexes of Oxalic Acid and Schiff Base Trimethoprim with Various Metal Ions

Mn (II) and Zn (II) complexes of a benzimidazole ligand having undecyl chains: Crystal structures, photophysical and thermal properties

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