Mechanochemical synthesis and spectroscopic properties of 1,1′-ferrocenyldiacrylonitriles: the effect of <i>para</i>-substituents

Ombaka, Lucy M.; Ndungu, Patrick; Omondi, Bernard; Nyamori, Vincent O.

doi:10.1080/00958972.2014.931946

Cited by 12 publications

(14 citation statements)

References 36 publications

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“…The crystal structure of the para-CF 3 catalyst contains a more bulky -CF 3 group on the para-position as opposed to the para-CN and para-Cl groups in the previously reported catalysts [20]. The bulky -CF 3 group does not seem to affect the arrangement of the two para-(trifluoromethyl)phenylacrylonitrile moieties since the structure adopts a cisoidal conformation which is observed in less bulky groups (para -CN and -Cl) that have been previously reported [20]. However, the two -CF 3 groups seem to influence the conformation around the C 11 -C 13 and C 20 -C 22 double bond in which the CN groups are observed to face opposite directions.…”

Section: Crystal Structure Of the Para-cf 3 Catalystmentioning

confidence: 73%

“…Synthesis of para-CN, para-Cl and para-CF 3 substituted catalysts was conducted as reported by Ombaka et al [20]. Grinding together 1,1′-ferrocenedicarboxaldehyde and the substituted phenylacetonitriles in the presence of a drop of piperidine yielded the para-CN, para-Cl and para-CF 3 substituted catalysts as depicted in Scheme 1 [20].…”

Section: Synthesis Of Para-cn Para-cl and Para-cf 3 Catalystsmentioning

confidence: 99%

“…We have previously reported the synthesis and characterization of the para-CF 3 catalyst [20], however, the crystal structure of this catalyst has not been reported. The molecular structure and atom numbering scheme of the para-CF 3 catalyst is presented in Fig.…”

Section: Crystal Structure Of the Para-cf 3 Catalystmentioning

confidence: 99%

See 2 more Smart Citations

A facile approach towards increasing the nitrogen-content in nitrogen-doped carbon nanotubes via halogenated catalysts

Ombaka

Ndungu

Omondi

et al. 2016

Journal of Solid State Chemistry

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Nitrogen-doped carbon nanotubes (N-CNTs) have been synthesized at 850 °C via a CVD deposition technique by use of three ferrocenyl derivative catalysts, i.e. para-CN,-CF 3 and-Cl substituted-phenyl rings. The synthesized catalysts have been characterized by NMR, IR, HR-MS and XRD. The XRD analysis of the para-CF 3 catalyst indicates that steric factors influence the X-ray structure of 1,1′-ferrocenylphenyldiacrylonitriles. Acetonitrile or pyridine was used as carbon and nitrogen sources to yield mixtures of N-CNTs and carbon spheres (CS). The N-CNTs obtained from the para-CF 3 catalysts, in pyridine, have the highest nitrogen-doping level, show a helical morphology and are less thermally stable compared with those synthesised by use of the para-CN and-Cl as catalyst. This suggests that fluorine heteroatoms enhance nitrogendoping in N-CNTs and formation of helical-N-CNTs (H-N-CNTs). The para-CF 3 and para-Cl catalysts in acetonitrile yielded iron-filled N-CNTs, indicating that halogens promote encapsulation of iron into the cavity of N-CNT. The use of acetonitrile, as carbon and nitrogen source, with the para-CN and-Cl as catalysts also yielded a mixture of N-CNTs and carbon nanofibres (CNFs), with less abundance of CNFs in the products obtained using para-Cl catalysts. However, para-CF 3 catalyst in acetonitrile gave N-CNTs as the only shaped carbon nanomaterials.

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Section: Crystal Structure Of the Para-cf 3 Catalystmentioning

confidence: 73%

Section: Synthesis Of Para-cn Para-cl and Para-cf 3 Catalystsmentioning

confidence: 99%

See 1 more Smart Citation

A facile approach towards increasing the nitrogen-content in nitrogen-doped carbon nanotubes via halogenated catalysts

Ombaka

Ndungu

Omondi

et al. 2016

Journal of Solid State Chemistry

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“…The first oxidation potential of 1 (410 mV) is lower than 2 (476 mV), illustrating that trimethylsilyl has stronger electron-donating effects [28,29]. The electronic communication effect of 1 and 2 was discussed through comparing the half-wave potential differences Tetraferrocenylbenzene 455 (ΔE 1/2 ) between ferrocenyl units.…”

Section: Electrochemistrymentioning

confidence: 99%

Synthesis of tetraferrocenylbenzene by cycloaddition reaction with alkyl cobalt clusters as reaction precursors

Xie

Han

Zhu

et al. 2015

Journal of Coordination Chemistry

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2015) Synthesis of tetraferrocenylbenzene by cycloaddition reaction with alkyl cobalt clusters as reaction precursors, Journal of Coordination Chemistry, 68:3, 449-460, Two tetraferrocenylbenzene derivatives, 1-trimethylsilyl-2,3,4,5-tetraferrocenylbenzene (1) and 1,2,4,5-tetraferrocenylbenzene (2), were synthesized by cycloaddition reactions of alkynes with Co 2 (CO) 6 (μ 2 -alkyne) as reaction precursors and characterized by elemental analysis, FT-IR, NMR, and MS. The molecular structures of 1 and 2 were identified by single-crystal X-ray diffraction. The redox properties were studied by cyclic voltammetry and square wave voltammetry, which indicated stronger electronic communication among ferrocenyl units.

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“…The use of microwave to synthesize nanoparticles is a promising method as it results to consistently uniform particle sizes, higher degree of crystallization, and narrower size distributions preventing agglomeration of particles (Iravani et al, ). Other than the good yields of nanoparticles, microwave‐assisted synthesis helps to reduce reaction time and chemical waste as it supports solvent‐free reaction (Ombaka et al, ; Saloga et al, ).…”

Section: Introductionmentioning

confidence: 99%

One‐pot microwave‐assisted synthesis of size‐dependent l‐glutathione‐capped spherical silver nanoparticles suitable for materials with antibacterial properties

Nyamu

Ombaka

Masika

et al. 2019

J of Interdiscip Nanomed

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In the last years, there has been an alarming increase in antibiotic resistance by pathogenic microbes, which has become a major public health concern. There is a great interest in developing new antimicrobial for reducing the impact. Silver nanoparticles (AgNPs) as antibacterial agents are currently being studied to be used to fight these pathogenic microbes. The aim of the present study was to synthesize AgNPs of different sizes through the use of microwave and determine their antimicrobial activities. Synthesis of sizedependent L-glutathione-capped spherical nanoparticles through one-pot microwave synthesis was achieved, and their antimicrobial properties were determined. Different sizes of AgNPs between 5-10, 15-35, and 50-80 nm were made by varying the concentration of silver nitrate and using sodium borohydride (NaBH 4 ) as a reducing agent. L-glutathione was used to stabilize the AgNPs to prevent them from aggregation in the colloidal solution.The synthesized AgNPs showed ultraviolet absorption at around 400 nm with high concentration of AgNO 3 having sharp peaks. The formed particles were crystalline in nature with uniform spherical shape. The formed AgNPs were of crystalline size of 9. 94, 18.45, 34.96, 52.40, and 58.50 nm. Fourier transform infrared analysis confirmed conjugation of glutathione as a capping agent to AgNPs as the result of the formed spectra showing the absence of ─SH stretch. The high temperature generated by microwave helped to synthesize nanoparticles within a short time and by varying the concentration of AgNO 3 helped obtain the desired particle size. Glutathione conjugated well with AgNPs as a result of interaction of negative thiol resulting to colloidal stabilization and reduced aggregation. The antibacterial activity of AgNPs was found to be size dependent with the smaller size of 9.94 nm being more efficient than 18. 45, 34.96, 52.40, and 58.50 nm against the tested strains Bacillus subtilis (ATCC 6633), Escherichia coli (ATCC 25922), Salmonella spp. (ATCC 700623), and Staphylococcus aureus (ATCC 25923). Of the four stains, E. coli was found to be the least affected by all three different particle sizes of the synthesized AgNPs.

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Mechanochemical synthesis and spectroscopic properties of 1,1′-ferrocenyldiacrylonitriles: the effect of para-substituents

Cited by 12 publications

References 36 publications

A facile approach towards increasing the nitrogen-content in nitrogen-doped carbon nanotubes via halogenated catalysts

A facile approach towards increasing the nitrogen-content in nitrogen-doped carbon nanotubes via halogenated catalysts

Synthesis of tetraferrocenylbenzene by cycloaddition reaction with alkyl cobalt clusters as reaction precursors

One‐pot microwave‐assisted synthesis of size‐dependent l‐glutathione‐capped spherical silver nanoparticles suitable for materials with antibacterial properties

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