Preparation, characterization and pH-metric measurements of 4-hydroxysalicylidenechitosan Schiff-base complexes of Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Ru(III), Rh(III), Pd(II) and Au(III)

Anan, Neveen A.; Hassan, Shawky M.; Saad, Eman M.; Butler, Ian S.; Mostafa, Sahar I.

doi:10.1016/j.carres.2011.01.014

Cited by 104 publications

(55 citation statements)

References 45 publications

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“…5a, showed the characteristic peaks at 2h = 9.5°a nd 2h = 20°, which suggest the formation of interand intra-molecular hydrogen bonds in chitosan (Haas and Franz 2009). The XRD patterns of its copper complex showed a decrease in the intensity of the Cellulose peaks and they were more broadened than those observed for pure chitosan, indicating a low crystallinity of the complex (Anan et al 2011).…”

Section: Resultsmentioning

confidence: 92%

Study of chitosans interaction with Cu(II) from the corresponding sulfate and chloride salts

et al. 2015

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The interaction of copper ions with chitosan and three synthesized derivatives with different chelating centers, N-benzylidene chitosan, N-benzyl chitosan and poly-N-(4-(4-R-methoxyphenyl)diazenyl)-benzyl-chitosan using CuSO 4 Á5H 2 O and CuCl 2 Á2H 2 O salts was studied. The content of Cu 2? in the complexes was determined by atomic absorption spectrometry and the results showed that chitosan exhibited higher chelating capacity for both salts. Morphological changes of derivatives and complexes were demonstrated by SEM-EDS. In addition, the presence of some crystals attributed to copper sulfate adsorbed on the polymer surface was also observed, which indicates that part of the metal content is in the salt adsorbed and might influence in the use of the materials for further application studies. This result was supported by Raman spectroscopy results in which vibrations of O=S=O groups were observed. X-ray diffraction patterns showed that the chemical modification of chitosan and formation of complexes resulted in the decrease of crystallinity. Electron paramagnetic resonance was used to investigate structural aspects of the materials complexed with Cu 2? ions in the solid state.

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Section: Resultsmentioning

confidence: 92%

Study of chitosans interaction with Cu(II) from the corresponding sulfate and chloride salts

et al. 2015

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“…It has two characteristic peaks at 2Â = 10.4 and 19.8 in the XRD spectrum [43]. In this study, two peaks at 2Â = 10.44 and 19.86 were observed in the XRD spectra of CS (Fig.…”

Section: Xrdmentioning

confidence: 83%

“…Chitosan has been reported to have higher crystallinity arising from the strong inter-molecular hydrogen bonds [42,43]. It has two characteristic peaks at 2Â = 10.4 and 19.8 in the XRD spectrum [43].…”

Section: Xrdmentioning

confidence: 99%

Cu(II) and Pd(II) complexes of water soluble O-carboxymethyl chitosan Schiff bases: Synthesis, characterization

Baran

Menteş

2015

International Journal of Biological Macromolecules

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“…It was reported that chitosan has two characteristic sharp peaks at ~10 and 20° [17]. In the diagram of the glyoxal cross-linked chitosan Schiff base, the intensity of these characteristic peaks were weakened and the crystallinity value of chitosan was decreased after the cross-linking procedure (Figure 2a).…”

Section: X-ray Diffractionmentioning

confidence: 94%

New Chitosan-Glyoxal Beads Supported Pd(II) Catalyst: Synthesis, Characterization and Application in Suzuki Coupling Reactions

Baran¹

2016

HJBC

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Ö Z E T B u çalışmada, Suzuki çapraz kenetlenme tepkimeleri için yeni bir kitosan boncuk destekli Pd(II) katalizörü hazırlandı ve yapısı FTIR, XRD, TGA, SEM/EDAX ve ICP-OES analizleri ile karakterize edildi. Katalizörün, katalitik ve tekrar kullanılabilirlik performansları mikrodalga ısıtma altında ve çözücüsüz ortamda biaril bileşiklerinin sentezinde araştırıldı. Katalizör basit ve hızlı bir mikrodalga ısıtma yöntemi ileiyi dönüşüm tepkime verimleri ve yüksek TON ve TOF değerleri sağladı. Ayrıca optimum koşullar altında tekrar kullanılabilirlik testleri katalizörün beş çevrime kadar kullanılabileceğini gösterdi. Anahtar KelimelerKenetleme tepkimeleri, biaril, tekrar kullanılabilirlik, kitosan, Schiff bazı. A B S T R A C TI n this paper, a new chitosan bead supported Pd(II) catalyst was prepared and its structure was characterized with FTIR, XRD, TGA, SEM/EDAX and ICP-OES analyses for Suzuki coupling reactions. The catalytic and recyclable performances of the catalyst were explored in the synthesis of biaryl compounds under microwave heating and free solvent media. The catalyst provided good conversion reaction yields and high TON and TOF values with a simple and quick microwave heating procedure. In addition, the recycle tests indicated that the catalyst could be used for up to seven runs under optimum reaction conditions.

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Preparation, characterization and pH-metric measurements of 4-hydroxysalicylidenechitosan Schiff-base complexes of Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Ru(III), Rh(III), Pd(II) and Au(III)

Cited by 104 publications

References 45 publications

Study of chitosans interaction with Cu(II) from the corresponding sulfate and chloride salts

Study of chitosans interaction with Cu(II) from the corresponding sulfate and chloride salts

Cu(II) and Pd(II) complexes of water soluble O-carboxymethyl chitosan Schiff bases: Synthesis, characterization

New Chitosan-Glyoxal Beads Supported Pd(II) Catalyst: Synthesis, Characterization and Application in Suzuki Coupling Reactions

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