Synthesis, crystal structures and CT-DNA/BSA binding properties of Co(III) and Cu(II) complexes with bipyridine Schiff base ligand

Chang, Lingling; Yang, Jie; Lai, Shi-qi; Liu, Xiang-rong; Yang, Zaiwen; Zhao, Shunsheng

doi:10.1016/j.ica.2021.120751

Cited by 15 publications

(9 citation statements)

References 47 publications

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“…The final mass loss after heating to 300 °C is 83% for CuL 1 and 86% for CuL 2 , which is in line with the formation of CuO (calculated loss of 85%). The same behavior was observed for comparable Cu(II) complexes [ 60 , 61 , 62 , 63 ].…”

Section: Resultssupporting

confidence: 79%

Structure, Optical and Magnetic Properties of Two Isomeric 2-Bromomethylpyridine Cu(II) Complexes [Cu(C6H9NBr)2(NO3)2] with Very Different Binding Motives

et al. 2023

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Two isomeric 2-bromomethylpyridine Cu(II) complexes [Cu(C6H9NBr)2(NO3)2] with 2-bromo-5-methylpyridine (L1) and 2-bromo-4-methylpyridine (L2) were synthesized as air-stable blue materials in good yields. The crystal structures were different with [Cu(L1)2(NO3)2] (CuL1) crystallizing in the monoclinic space group P21/c, while the 4-methyl derivative CuL2 was solved and refined in triclinic P1¯. The orientation of the Br substituents in the molecular structure (anti (CuL1) vs. syn (CuL2) conformations) and the geometry around Cu(II) in an overall 4 + 2 distorted coordination was very different with two secondary (axially elongated) Cu–O bonds on each side of the CuN2O2 basal plane in CuL1 or both on one side in CuL2. The two Br substituents in CuL2 come quite close to the Cu(II) centers and to each other (Br⋯Br ~3.7 Å). Regardless of these differences, the thermal behavior (TG/DTA) of both materials is very similar with decomposition starting at around 160 °C and CuO as the final product. In contrast to this, FT-IR and Raman frequencies are markedly different for the two isomers and the UV–vis absorption spectra in solution show marked differences in the π–π* absorptions at 263 (CuL2) or 270 (CuL1) nm and in the ligand-to-metal charge transfer bands at around 320 nm which are pronounced for CuL1 with the higher symmetry at the Cu(II) center, but very weak for CuL2. The T-dependent susceptibility measurements also show very similar results (µeff = 1.98 µB for CuL1 and 2.00 µB for CuL2 and very small Curie–Weiss constants of about −1. The EPR spectra of both complexes show axial symmetry, very similar averaged g values of 2.123 and 2.125, respectively, and no hyper-fine splitting.

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Section: Resultssupporting

confidence: 79%

Structure, Optical and Magnetic Properties of Two Isomeric 2-Bromomethylpyridine Cu(II) Complexes [Cu(C6H9NBr)2(NO3)2] with Very Different Binding Motives

et al. 2023

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“…Co., China. The PVDF FR903 (density of 1.78 g/cm 3 , E b $ 10 3 kV/cm) was obtained from 3F New Materials Co. (Shanghai, China) and was as the host polymer. The N, N-dimethylformamide (DMF) was purchased from Tianjin Chemical Reagent Co. China.…”

Section: Experimental 21 | Materialsmentioning

confidence: 99%

“…In recent years, dielectric materials with high dielectric constant (ε), large thermal conductivity (TC) and extremely low dielectric loss have attracted great attention because of their wide range of applications in advanced electrical and power system, such as actuators, charge storage capacitors, and pulse power sensors, et al 1,2 Compared to the high ε inorganic ceramics such as lead titanate (PbTiO 3 ), titanium dioxide (TiO 2 ), and barium strontium titanate (BST), et al, polymers offer more excellent properties and a wide range of competitive advantages such as high breakdown strength (E b ), rather low loss, easy processing and excellent flexibility. [3][4][5] However, most polymers have inherently low ε (<10) and TC, which hinders their practical application in microelectronics and electrical industries. 6 To overcome the disadvantages of either polymers or ceramics, composite dielectrics comprising high E b organic polymers and giant-ε inorganic ceramics have been developed during the past 2 decades.…”

Section: Introductionmentioning

confidence: 99%

Morphological engineering of SiO₂ interlayer towards meliorative dielectric and thermal properties in β‐SiC_w@SiO₂/PVDF composites

et al. 2023

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Polymers with high thermal conductivity (TC) and dielectric constant (ε) but low dielectric loss show enormously potential applications in electrical power systems. To enhance the ε and TC while significantly suppressing the loss of β‐silicon carbide whisker (β‐SiCw)/polyvinylidene fluoride (PVDF), in this study, SiO2 shells with different morphologies were constructed on the superficies of β‐SiCw via a facile oxidation method in air atmosphere. The SiO2 shell’ morphology on the TC and dielectric performances of the β‐SiCw@SiO2/PVDF are systematically explored as a function of the frequency and filler loading. The β‐SiCw@SiO2/PVDF demonstrate astonishingly restricted loss and meliorative TC when compared to the β‐SiCw/PVDF because the SiO2 shell not only suppresses the β‐SiCw from direct contact with one another and impedes the long‐distance charges migration thereby resulting in rather low loss and leakage conductivity, but also restrains the thermal interfacial resistance via increased interfacial compatibility and interactions. The concurrent enhancement effect in the ε and TC but low loss of the composites is more evident in the crystalline SiO2 interlayer with a high TC compared with amorphous one. These results provide insight into the exploration of composite nanodielectrics with large TC and ε but low loss for applications in electrical power systems.Highlights Core@shell structured β‐SiCw@SiO2/PVDF were obtained by a facile oxidation. The great reduction in both loss and conductivity is attributed to the SiO2 shell. Crystalline SiO2 shell can improve the composites' thermal conductivity. The SiO2 shell prevents long‐range carrier migration.

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“…To boost the high-field E b and reduce the loss or tanδ of Mo/poly(vinylidene fluoride) (PVDF), this study aims to employ a calcination method under air atmosphere to build a semi-conductor molybdenum oxide (MoO 3 ) shell on the superficies of raw Mo. [32][33][34][35][36] Additionally, an organic polystyrene (PS) shell was built outer the Mo@MoO 3 utilizing a suspension polymerization technique. The addition of the PS interlayer in the Mo@MoO 3 @PS/PVDF compound aims to improve their comprehensive dielectric performances.…”

Section: Introductionmentioning

confidence: 99%

Interfacial insight of core@double‐shell Mo@MoO₃@PS/PVDF composites towards prominently meliorative dielectric performances

Wang

Zhou

Chen

et al. 2023

J of Applied Polymer Sci

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Polymer dielectrics with synergistically large dielectric permittivity (ε') and breakdown strength (Eb) but prohibited loss is of crucial applications in the electronic devices and power equipment. In this study, we aim to elevate the integrated dielectric performances of molybdenum (Mo)/polyvinylidene fluoride (PVDF) by constructing a semiconducting molybdenum oxide (MoO3) shell and insulating polystyrene (PS) shell on the Mo surface through high‐temperature oxidation followed by suspension polymerization. The resulting core@double‐shell Mo@MoO3@PS particles were compounded with PVDF to achieve high ε' and Eb while minimizing the loss. The results reveal that the Mo@MoO3@PS/PVDF composites indicate simultaneously ameliorative ε' and Eb along with restrained loss owing to the existence of the MoO3@PS double‐shell, which not only prominently enhances the interfacial compatibility and interactions between fillers and PVDF, but significantly inhibits the conductivity and loss through impeding the long‐distance motion of carrier charges. The dielectric capabilities could be improved by adjusting the thickness of the PS interlayer. The Havriliak‐Negami equation was used to fit the experimental results, which showed the impact of the PS shell on the polarization mechanism and how it inhibits carrier migration. The Mo@MoO3@PS/PVDF with high ε' and Eb yet exceptionally low loss exhibit potential applications in microelectronics and electrical industries.

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Synthesis, crystal structures and CT-DNA/BSA binding properties of Co(III) and Cu(II) complexes with bipyridine Schiff base ligand

Cited by 15 publications

References 47 publications

Structure, Optical and Magnetic Properties of Two Isomeric 2-Bromomethylpyridine Cu(II) Complexes [Cu(C6H9NBr)2(NO3)2] with Very Different Binding Motives

Structure, Optical and Magnetic Properties of Two Isomeric 2-Bromomethylpyridine Cu(II) Complexes [Cu(C6H9NBr)2(NO3)2] with Very Different Binding Motives

Morphological engineering of SiO₂ interlayer towards meliorative dielectric and thermal properties in β‐SiC_w@SiO₂/PVDF composites

Interfacial insight of core@double‐shell Mo@MoO₃@PS/PVDF composites towards prominently meliorative dielectric performances

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Synthesis, crystal structures and CT-DNA/BSA binding properties of Co(III) and Cu(II) complexes with bipyridine Schiff base ligand

Cited by 15 publications

References 47 publications

Structure, Optical and Magnetic Properties of Two Isomeric 2-Bromomethylpyridine Cu(II) Complexes [Cu(C6H9NBr)2(NO3)2] with Very Different Binding Motives

Structure, Optical and Magnetic Properties of Two Isomeric 2-Bromomethylpyridine Cu(II) Complexes [Cu(C6H9NBr)2(NO3)2] with Very Different Binding Motives

Morphological engineering of SiO2 interlayer towards meliorative dielectric and thermal properties in β‐SiCw@SiO2/PVDF composites

Interfacial insight of core@double‐shell Mo@MoO3@PS/PVDF composites towards prominently meliorative dielectric performances

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Morphological engineering of SiO₂ interlayer towards meliorative dielectric and thermal properties in β‐SiC_w@SiO₂/PVDF composites

Interfacial insight of core@double‐shell Mo@MoO₃@PS/PVDF composites towards prominently meliorative dielectric performances