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Sallam, Shehab A.; Orabi, Adel S.; El‐Shetary, B. A.; Lentz, A.

doi:10.1023/a:1015085023602

Cited by 73 publications

(47 citation statements)

References 22 publications

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“…In our recent studies on higher-coordinate silicon compounds, we have demonstrated that the silanes tetra(cyanato-N)silane (Si(NCO) 4 ) and tetra(thiocyanato-N)silane (Si(NCS) 4 ) are very useful precursors in the synthesis of neutral hexacoordinate silicon(iv) complexes, such as compounds 1-7.…”

Section: Introductionmentioning

confidence: 99%

“…[ [1][2][3] These silicon(iv) complexes contain two monodentate NCX À (X = O, S) ligands each and two bidentate monoanionic chelate ligands (1)(2)(3)(4)(5)(6) or one tetradentate dianionic chelate ligand (7). We have now succeeded in synthesizing the pentacoordinate silicon compounds 8 and 9 and the hexacoordinate silicon compound 10·1/2 CH 3 CN, starting from Si(NCO) 4 or Si(NCS) 4 .…”

Section: Introductionmentioning

confidence: 99%

“…We have now succeeded in synthesizing the pentacoordinate silicon compounds 8 and 9 and the hexacoordinate silicon compound 10·1/2 CH 3 CN, starting from Si(NCO) 4 or Si(NCS) 4 . These silicon(iv) complexes contain one or two tridentate dianionic chelate ligands derived from 4-[(2-hydroxyphenyl)amino]pent-3-en-2-one by twofold deprotonation.…”

Section: Introductionmentioning

confidence: 99%

“…[8] Results and Discussion Syntheses: Compound 8 was synthesized according to Scheme 1 by treatment of Si(NCO) 4 with one molar equivalent of 4-[(2-hydroxyphenyl)amino]pent-3-en-2-one at À20 8C in acetonitrile. [9] Compound 9 was prepared analogously at 20 8C, starting from Si(NCS) 4 . [9] Treatment of Si(NCO) 4 Si) NMR studies.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Structural Characterization of Neutral Higher‐Coordinate Silicon(iv) Complexes with Tridentate Dianionic Chelate Ligands

Seiler

Burschka

Metz

et al. 2005

Chemistry A European J

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The neutral pentacoordinate silicon(IV) complexes 8 and 9 with an SiO2N3 skeleton and the neutral hexacoordinate silicon(IV) complex 10.1/2 CH3CN with an SiO4N2 skeleton were synthesized, starting from tetra(cyanato-N)silane or tetra(thiocyanato-N)silane. Compounds 8 and 9 contain one tridentate dianionic ligand derived from 4-[(2-hydroxyphenyl)amino]pent-3-en-2-one and two monodentate singly charged cyanato-N or thiocyanato-N ligands bound to the silicon(IV) coordination center, whereas the silicon(IV) center of 10 is coordinated by two of these tridentate dianionic ligands. All compounds were characterized by single-crystal X-ray diffraction and solid-state and solution NMR spectroscopy. To get more information about the stereochemistry of the compounds studied, the experimental investigations were complemented by computational studies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis and Structural Characterization of Neutral Higher‐Coordinate Silicon(iv) Complexes with Tridentate Dianionic Chelate Ligands

Seiler

Burschka

Metz

et al. 2005

Chemistry A European J

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“…35 The electronic spectrum of this complex in nujol mull shows several absorptions at 370, 451, 482 and 510 nm, the respectively, which are typical to octahedral Fe(III) complex. 36,37 However, in HCl, the complex exhibits two absorptions at λ max =471 nm (ε=150.9 M , configuration. It gives a signal at g=4.4 which is similar to Fe 3+ complexes.…”

Section: Iron(iii) Complexmentioning

confidence: 99%

Synthesis and Spectroscopic Characterization of Manganese(II), Iron(III) and Cobalt(III) Complexes of Macrocyclic Ligand. Potential of Cobalt(III) Complex in Biological Activity

El‐Tabl¹,

Shakdofa²,

El‐Seidy³

2011

Journal of the Korean Chemical Society

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ABSTRACT. A new series of manganese(II), iron(III) and cobalt(III) complexes of 14-membered macrocyclic ligand, (3,6, 10,13,16,19-hexaazabicyclo[6.6.6]icosane-1,8-diamine) have been prepared and characterized by elemental analyses, IR, UV-VIS, 1 H-and 13 C-NMR spectra, magnetic susceptibilities, conductivities, and ESR measurements. Molar conductance measurements in DMF solution indicate that the complexes are electrolytes. The ESR spectrum for cobalt(III) complex in CD3OD+10%D2O after exposure to 60 Co-γ-rays at 77 K using a 0.2217 M rad h -1 vicrad source showed g⊥>g||>ge, indicating that, the unpaired electron site is mainly present in the dz2 orbital with covalent bond character. In this case, the ligand hyperfine tensors are nearly collinear with γ-tensors, so there is no major tendency to bend. Therefore, little extra delocalization via the ring lobe of the dz 2 orbital occurs. However, the ESR spectrum in solid state after exposure to 60 Co-γ-rays at 77 K showed g||>g⊥>ge, indicating that, the unpaired electron site is mainly present in the dx2-y2 ground state as the resulting spectrum contains a large number of randomly oriented molecules provided that, the principle directions of g and A tensors. Manganese (II) complex 2, [H12LMn]Cl4.2H2O, showed six isotropic lines characteristic to an unpaired electron interacting with a nucleus of spin 5/2, however, iron(III) complex 3, [H12LFe]Cl5.H2O, showed spectrum of a high spin 57 Fe (I=1/2), d 5 configuration. The geometry of these complexes was supported by elemental analyses, IR, electronic and ESR spectral studies. Complex 1 showed exploitation in reducing the amount of electron adducts formed in DNA during irradiation with low radiation products.

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Selective oxidation of olefins and aromatic alcohols with tert‐butylhydroperoxide catalyzed by polymer‐anchored transition‐metal complexes

Roy

Mondal

et al. 2011

J of Applied Polymer Sci

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Three polymer-anchored metal complexes (Co, Cu, and Pd) were synthesized and characterized. The catalytic performance of these complexes was tested for the oxidation of olefins and aromatic alcohols. These complexes showed excellent catalytic activity and high selectivity. These complexes selectively gave epoxides and aldehydes from olefins and alcohols, respectively. Individually, the effect of various solvents, oxidants, substrate oxidant molar ratios, temperatures, and catalyst amounts for the oxidation of cyclohexene and benzyl alcohol were studied. Under optimized reaction conditions, 96, 81, and 71% conversions of cyclohexene and 86, 79, and 73% conversions of benzyl alcohol were obtained with Co(II), Cu(II), and Pd(II) catalysts, respectively. The catalytic results reveal that these complexes could be recycled more than five times without much loss in activity.

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Cited by 73 publications

References 22 publications

Synthesis and Structural Characterization of Neutral Higher‐Coordinate Silicon(iv) Complexes with Tridentate Dianionic Chelate Ligands

Synthesis and Structural Characterization of Neutral Higher‐Coordinate Silicon(iv) Complexes with Tridentate Dianionic Chelate Ligands

Synthesis and Spectroscopic Characterization of Manganese(II), Iron(III) and Cobalt(III) Complexes of Macrocyclic Ligand. Potential of Cobalt(III) Complex in Biological Activity

Selective oxidation of olefins and aromatic alcohols with tert‐butylhydroperoxide catalyzed by polymer‐anchored transition‐metal complexes

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