Acta crystallographica. Section E, Structure reports online, Jan 2, 2008
The title compound, C(22)H(18)N(4)O(2)S(2), was characterized by (1)H and (13)C NMR, solid-state ... more The title compound, C(22)H(18)N(4)O(2)S(2), was characterized by (1)H and (13)C NMR, solid-state IR spectroscopy and X-ray crystallographic techniques. The crystal structure determination reveals that the twisting modes of the two side arms are different [C-N-C-O and C-N-C-N torsion angles = -1.2 (3) and 1.1 (3)°, respectively, in one arm and 24.1 (3) and -5.1 (3)°, respectively, in the other]. The crystal structure involves N-H⋯O and N-H⋯S hydrogen bonds.
Reaction of 2,6-bis(phenylhydrazone)pyridine with Ln(NO3)3·6H2O nitrate (Ln=Y, Pr, Sm and Er) pro... more Reaction of 2,6-bis(phenylhydrazone)pyridine with Ln(NO3)3·6H2O nitrate (Ln=Y, Pr, Sm and Er) produces mononuclear complexes. The crystal structures of [Ln(C23H19N5O2)(H2O)(NO3)] (Ln=Y or Er) and {[Ln(C23H19N5O2)(C23H20N5O2)](H2O)2((CH3)2SO)} (Ln=Pr or Sm) were determined. Coordination of the dianionic and the monoanionic ligands in the complexes is via the pyridyl nitrogen, hydrazino nitrogen and iminol oxygen. The crystal structures were determined.In the isostructural complexes (Ln=Y, Er)
... Abdou S. Sall,*a Mohamed Gaye,a Oumar Sarr,a A. Caneschi,b Vito Di Notoc and Maurizio Vidalic... more ... Abdou S. Sall,*a Mohamed Gaye,a Oumar Sarr,a A. Caneschi,b Vito Di Notoc and Maurizio Vidalic aFaculté des Sciences et Techniques, Département de Chimie Université Cheikh Anta Diop de Dakar, Sénégal bDipartimento di Chimica Universit`a di Firenze, Via Maragliano ...
ABSTRACT The tetranuclear nickel(II) complex [Ni4(HL)4]Cl4·4H2O {H2L = 1,5-bis[1-(pyridin-2-yl)et... more ABSTRACT The tetranuclear nickel(II) complex [Ni4(HL)4]Cl4·4H2O {H2L = 1,5-bis[1-(pyridin-2-yl)ethylidene]carbono hydrazone} has been prepared by reaction in methanol of nickel(II) chloride and H2L in 2:1, M:L molar ratio. The single crystal X-ray diffraction analysis revealed a 2 × 2 square grid of tetramer units with the metal ions joined in pairs by the alkoxide oxygen atom in the μ2 mode with octahedral geometry around each nickel ion. The supramolecular structure shows that the tetramer units are linked through edge-to-face (T shape) C–H···π interactions, forming sheets with hydrophobic- (occupied by infinite 2D water–chlorine chains) and hydrophilic- (occupied by chlorine anions) channels. Variable temperature magnetic studies suggest an antiferromagnetic coupling between the adjacent Ni(II) centers with a coupling constant of J = −6.6 cm–1.
Reaction of 2, 6-bis (phenylhydrazone) pyridine with Ln (NO3) 3· 6H2O nitrate (Ln= Y, Pr, Sm and ... more Reaction of 2, 6-bis (phenylhydrazone) pyridine with Ln (NO3) 3· 6H2O nitrate (Ln= Y, Pr, Sm and Er) produces mononuclear complexes. The crystal structures of [Ln (C23H19N5O2)(H2O)(NO3)](Ln= Y or Er) and {[Ln (C23H19N5O2)(C23H20N5O2)](H2O) ...
We describe an efficient synthesis of an ionic liquid-supported TEMPO which was used for the oxid... more We describe an efficient synthesis of an ionic liquid-supported TEMPO which was used for the oxidation of alcohols to aldehydes and ketones. The predictable solubility of ionic liquids allows an easy separation of the oxidation products from reagents. Furthermore, the ...
ABSTRACT Two Schiff bases (H3L1 and H5L2), derived from 2,6-diformyl-4-chlorophenol and hydrazide... more ABSTRACT Two Schiff bases (H3L1 and H5L2), derived from 2,6-diformyl-4-chlorophenol and hydrazides, and their complexes with some lanthanides (V, La, Nd, Sm, Dy and Er) have been synthesized. These compounds have been characterized by means of elemental analysis, UV-Vis spectroscopy, IR spectroscopy, H-1 and C-13 NMR (for the organic ligands), molar conductance and room temperature magnetic measurements. Single crystal X-ray analysis of the two complexes [La-2(H2L1)(3)(C2H5OH)(2)]center dot(Cl)center dot(NO3)(2)((CH3)(2)CO)(2)center dot(H2O)(2) (1) and [Er-2(H4L2)(3)]center dot(SCN)(3)center dot(H2O) (8) has revealed the nature of the structures; the lanthanide(III) ions are intramolecularly bridged by three phenolic oxygen atoms, forming a dinuclear complex. The lanthanum atom is ten-coordinated, while the erbium atom is nine-coordinated. The coordination polyhedron of the erbium complex is best described as a tricapped trigonal prism.
... Abdou S. Sall,*a Mohamed Gaye,a Oumar Sarr,a A. Caneschi,b Vito Di Notoc and Maurizio Vidalic... more ... Abdou S. Sall,*a Mohamed Gaye,a Oumar Sarr,a A. Caneschi,b Vito Di Notoc and Maurizio Vidalic aFaculté des Sciences et Techniques, Département de Chimie Université Cheikh Anta Diop de Dakar, Sénégal bDipartimento di Chimica Universit`a di Firenze, Via Maragliano ...
Abstract: The title compound [Dy 2 (C 22 H 16 ClN 4 O 5) 3](SCN) 3 (H 2 O)(CH 3 OH) has been synt... more Abstract: The title compound [Dy 2 (C 22 H 16 ClN 4 O 5) 3](SCN) 3 (H 2 O)(CH 3 OH) has been synthesized and its crystal structure determined by single X-ray diffraction at room temperature. The two nine coordinated Dy (III) are bound to three macromolecules ligand ...
Acta crystallographica. Section E, Structure reports online, Jan 2, 2008
The title compound, C(22)H(18)N(4)O(2)S(2), was characterized by (1)H and (13)C NMR, solid-state ... more The title compound, C(22)H(18)N(4)O(2)S(2), was characterized by (1)H and (13)C NMR, solid-state IR spectroscopy and X-ray crystallographic techniques. The crystal structure determination reveals that the twisting modes of the two side arms are different [C-N-C-O and C-N-C-N torsion angles = -1.2 (3) and 1.1 (3)°, respectively, in one arm and 24.1 (3) and -5.1 (3)°, respectively, in the other]. The crystal structure involves N-H⋯O and N-H⋯S hydrogen bonds.
Reaction of 2,6-bis(phenylhydrazone)pyridine with Ln(NO3)3·6H2O nitrate (Ln=Y, Pr, Sm and Er) pro... more Reaction of 2,6-bis(phenylhydrazone)pyridine with Ln(NO3)3·6H2O nitrate (Ln=Y, Pr, Sm and Er) produces mononuclear complexes. The crystal structures of [Ln(C23H19N5O2)(H2O)(NO3)] (Ln=Y or Er) and {[Ln(C23H19N5O2)(C23H20N5O2)](H2O)2((CH3)2SO)} (Ln=Pr or Sm) were determined. Coordination of the dianionic and the monoanionic ligands in the complexes is via the pyridyl nitrogen, hydrazino nitrogen and iminol oxygen. The crystal structures were determined.In the isostructural complexes (Ln=Y, Er)
... Abdou S. Sall,*a Mohamed Gaye,a Oumar Sarr,a A. Caneschi,b Vito Di Notoc and Maurizio Vidalic... more ... Abdou S. Sall,*a Mohamed Gaye,a Oumar Sarr,a A. Caneschi,b Vito Di Notoc and Maurizio Vidalic aFaculté des Sciences et Techniques, Département de Chimie Université Cheikh Anta Diop de Dakar, Sénégal bDipartimento di Chimica Universit`a di Firenze, Via Maragliano ...
ABSTRACT The tetranuclear nickel(II) complex [Ni4(HL)4]Cl4·4H2O {H2L = 1,5-bis[1-(pyridin-2-yl)et... more ABSTRACT The tetranuclear nickel(II) complex [Ni4(HL)4]Cl4·4H2O {H2L = 1,5-bis[1-(pyridin-2-yl)ethylidene]carbono hydrazone} has been prepared by reaction in methanol of nickel(II) chloride and H2L in 2:1, M:L molar ratio. The single crystal X-ray diffraction analysis revealed a 2 × 2 square grid of tetramer units with the metal ions joined in pairs by the alkoxide oxygen atom in the μ2 mode with octahedral geometry around each nickel ion. The supramolecular structure shows that the tetramer units are linked through edge-to-face (T shape) C–H···π interactions, forming sheets with hydrophobic- (occupied by infinite 2D water–chlorine chains) and hydrophilic- (occupied by chlorine anions) channels. Variable temperature magnetic studies suggest an antiferromagnetic coupling between the adjacent Ni(II) centers with a coupling constant of J = −6.6 cm–1.
Reaction of 2, 6-bis (phenylhydrazone) pyridine with Ln (NO3) 3· 6H2O nitrate (Ln= Y, Pr, Sm and ... more Reaction of 2, 6-bis (phenylhydrazone) pyridine with Ln (NO3) 3· 6H2O nitrate (Ln= Y, Pr, Sm and Er) produces mononuclear complexes. The crystal structures of [Ln (C23H19N5O2)(H2O)(NO3)](Ln= Y or Er) and {[Ln (C23H19N5O2)(C23H20N5O2)](H2O) ...
We describe an efficient synthesis of an ionic liquid-supported TEMPO which was used for the oxid... more We describe an efficient synthesis of an ionic liquid-supported TEMPO which was used for the oxidation of alcohols to aldehydes and ketones. The predictable solubility of ionic liquids allows an easy separation of the oxidation products from reagents. Furthermore, the ...
ABSTRACT Two Schiff bases (H3L1 and H5L2), derived from 2,6-diformyl-4-chlorophenol and hydrazide... more ABSTRACT Two Schiff bases (H3L1 and H5L2), derived from 2,6-diformyl-4-chlorophenol and hydrazides, and their complexes with some lanthanides (V, La, Nd, Sm, Dy and Er) have been synthesized. These compounds have been characterized by means of elemental analysis, UV-Vis spectroscopy, IR spectroscopy, H-1 and C-13 NMR (for the organic ligands), molar conductance and room temperature magnetic measurements. Single crystal X-ray analysis of the two complexes [La-2(H2L1)(3)(C2H5OH)(2)]center dot(Cl)center dot(NO3)(2)((CH3)(2)CO)(2)center dot(H2O)(2) (1) and [Er-2(H4L2)(3)]center dot(SCN)(3)center dot(H2O) (8) has revealed the nature of the structures; the lanthanide(III) ions are intramolecularly bridged by three phenolic oxygen atoms, forming a dinuclear complex. The lanthanum atom is ten-coordinated, while the erbium atom is nine-coordinated. The coordination polyhedron of the erbium complex is best described as a tricapped trigonal prism.
... Abdou S. Sall,*a Mohamed Gaye,a Oumar Sarr,a A. Caneschi,b Vito Di Notoc and Maurizio Vidalic... more ... Abdou S. Sall,*a Mohamed Gaye,a Oumar Sarr,a A. Caneschi,b Vito Di Notoc and Maurizio Vidalic aFaculté des Sciences et Techniques, Département de Chimie Université Cheikh Anta Diop de Dakar, Sénégal bDipartimento di Chimica Universit`a di Firenze, Via Maragliano ...
Abstract: The title compound [Dy 2 (C 22 H 16 ClN 4 O 5) 3](SCN) 3 (H 2 O)(CH 3 OH) has been synt... more Abstract: The title compound [Dy 2 (C 22 H 16 ClN 4 O 5) 3](SCN) 3 (H 2 O)(CH 3 OH) has been synthesized and its crystal structure determined by single X-ray diffraction at room temperature. The two nine coordinated Dy (III) are bound to three macromolecules ligand ...
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