Synthesis and structure of the first molybdenum compound of N,O,N-hydroxybis(2-pyridyl)methanolato (η 3-dpkO, OH). The structure of [Mo(O)2(μ-O)(η 3-dpkO,OH)]2 · 2dmso

Hassan, Ishmael; Green, Orville

doi:10.1080/00958970600734517

Cited by 10 publications

(3 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The trans disposition of the oxo group with the chloro atom is unexpected for this type of complexes, since related tridentate N 2 O phenolate complexes of tungsten adopt a distorted octahedral structure with the two nitrogen donor atoms being located trans to the oxo groups, and with the phenolate oxygen opposite the chloro ligand [30]. Although a number of X-ray diffraction studies have been reported concerning the bidentated coordination of pyridine and quinoline derivatives [31], only three bimetallic dioxomolybdenum(VI) complexes have been described containing anionic tridentated ligands [32][33][34]. Therefore, complex 1 represents the first X-ray characterization for a monometallic molybdenum complex bearing a N,N',O-tridentated ligand [35,33].…”

Section: Scheme 1 Synthesis Of the Oxazoline Ligand Imentioning

confidence: 99%

cis-Dioxomolybdenum(VI) Complexes Containing Chiral Ligands: Synthesis and Catalytic Application in Olefin Epoxidation

Brito¹,

Saffon²,

Gómez³

et al. 2011

CIC

View full text Add to dashboard Cite

Novel cis-dioxomolybdenum(VI) complexes containing chiral ligands have been prepared and fully characterized, including structural determinations by X-ray diffraction. The first monometallic dioxomolybdenum(VI) complex containing a chiral N,N',O-tridentated ligand is reported. The new complexes were evaluated as catalysts for epoxidation of olefins using tert-butyl hydroperoxide and H 2 O 2 as oxidants. They were found to be efficient catalysts affording good chemoselectivity but low enantioselectivity.

show abstract

Section: Scheme 1 Synthesis Of the Oxazoline Ligand Imentioning

confidence: 99%

cis-Dioxomolybdenum(VI) Complexes Containing Chiral Ligands: Synthesis and Catalytic Application in Olefin Epoxidation

Brito¹,

Saffon²,

Gómez³

et al. 2011

CIC

View full text Add to dashboard Cite

show abstract

“…We reported on the synthesis, characterization, structures and optosensing behavior of a variety of di-2-pyridyl ketone derivatives and in recent reports described the optosensing behavior of di-2-pyridyl ketone thiophene-2-carboxylic acid hydrazone (dpktch) [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Optical measurements on dpktch in non-aqueous solvents show facile inter-conversion between two molecular conformations that are sensitive to changes in their surroundings [14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, spectroscopy, thermodynamics and structure of [ZnCl₂ (η³-dpktch)] (η³-dpktch = N,N,O- di-2-pyridyl ketone thiophene-2-carboxylic acid hydrazone)

Conry

Green

Mulder

2008

Journal of Coordination Chemistry

Self Cite

View full text Add to dashboard Cite

When dpktch was reacted with ZnCl 2 in refluxing acetonitrile in air [ZnCl 2 ( 3 -dpktch)] was isolated in good yield. Infrared spectra suggest weaker binding of dpktch in [ZnCl 2 ( 3 -dpktch)] than in [CdCl 2 ( 3 -dpktch)]. 1 H-NMR studies in non-aqueous media show that [ZnCl 2 ( 3 -dpktch)] is sensitive to changes in its environment and exchanges its amide proton. Electronic absorption spectral measurements confirmed the sensitivity of [ZnCl 2 ( 3 -dpktch)] to changes in its surroundings and show inter-conversion between two intra-ligand-charge-transfer transitions (ILCT) at 330 AE 2 nm and 404 AE 2 associated with [ZnCl 2 ( 3 -dpktch)] and its conjugate base. Thermo-optical measurements in non-aqueous dmf and dmso show facile interconversion between [ZnCl 2 ( 3 -dpktch)] and its conjugate base, respectively. Also, it is shown that protonation of dmf by [ZnCl 2 ( 3 -dpktch)] is exothermic (standard enthalpy of protonation ÁH ¼ À40.7 AE 1.8 kJ mol À1 ), but endothermic for dmso (ÁH ¼ þ8.3 AE 1.5 kJ mol À1 ). Chemical stimuli in concentrations as low as 5.0 Â 10 À7 M can be detected and determined using [ZnCl 2 ( 3 -dpktch)] in non-aqueous media. X-ray crystallographic studies on a monoclinic, P2 1 /n single crystal of [ZnCl 2 ( 3 -dpktch)] confirmed the N,N,O-coordination of dpktch and revealed interdigitated units of [ZnCl 2 ( 3 -dpktch)] connected via a web of hydrogen bonds.

show abstract

“…The N,O,N-tridentate binding mode results in the loss of electronic withdrawing properties of the ligand and enhances the electron density around the metal center [5]. Recently, the reaction of molybdenum(0) hexacarbonyl, [Mo(CO) 6 ], with dpk in refluxing toluene lead to the formation of a high-valent molybdenum(VI)-dioxo compound of hydrated di-2-pyridyl ketone, [Mo(O) 2 (-O)( 3 -dpkO,OH)] 2 [21].…”

Section: Introductionmentioning

confidence: 99%

Reactions of Dipyridylketone With Group 8 Metal Carbonyls in Different Media

Khalil

2008

Al-Azhar Bulletin of Science

View full text Add to dashboard Cite

Reaction of di-(2-pyridyl)ketone (dpk) with [M 3 (CO) 12 ], M =Ru or Os in dioxan under reduced pressure gave the tricarbonyl derivative [Ru(CO) 3 (dpk)] (1) and [Os(CO) 3 (dpk)] (2). When these reactions were carried out in benzene/ethanol 1:1 (v:v) under reflux and reduced pressure gave the binuclear ruthenium complex [Ru 2 (CO) 4 (-CO)( 3 -dpkO,Oeth) 2 ] (3), where  3 -dpkO,Oeth is N,O,N-ethoxybis(2-pyridyl)-methanolato and the mononuclear [Os(CO) 3 ( 3 -dpkO,Oeth) (4). All complexes were characterized by elemental analysis, infrared, mass and 1 H NMR spectroscopy. The spectroscopic measurements indicated that in dioxane as solvent the dpk act as bidentate ligand while in benzene/ethanol solution the dpk act as tridentate ligand. The magnetic measurements revealed that the complexes (3) and (4) are paramagnetic with change in the formal oxidation state of the ruthenium and osmium atoms from zero to +1 via oxidative addition of the OH group to ruthenium or osmium with a proton displacement to give a low-spin d 7 electronic configuration The UV-Vis studies of the complexes showed blue shift compared to the ligand confirming complex formation.

show abstract

Synthesis and structure of the first molybdenum compound of N,O,N-hydroxybis(2-pyridyl)methanolato (η ³-dpkO, OH). The structure of [Mo(O)₂(μ-O)(η ³-dpkO,OH)]₂ · 2dmso

Cited by 10 publications

References 26 publications

cis-Dioxomolybdenum(VI) Complexes Containing Chiral Ligands: Synthesis and Catalytic Application in Olefin Epoxidation

cis-Dioxomolybdenum(VI) Complexes Containing Chiral Ligands: Synthesis and Catalytic Application in Olefin Epoxidation

Synthesis, spectroscopy, thermodynamics and structure of [ZnCl₂ (η³-dpktch)] (η³-dpktch = N,N,O- di-2-pyridyl ketone thiophene-2-carboxylic acid hydrazone)

Reactions of Dipyridylketone With Group 8 Metal Carbonyls in Different Media

Contact Info

Product

Resources

About

Synthesis and structure of the first molybdenum compound of N,O,N-hydroxybis(2-pyridyl)methanolato (η 3-dpkO, OH). The structure of [Mo(O)2(μ-O)(η 3-dpkO,OH)]2 · 2dmso

Cited by 10 publications

References 26 publications

cis-Dioxomolybdenum(VI) Complexes Containing Chiral Ligands: Synthesis and Catalytic Application in Olefin Epoxidation

cis-Dioxomolybdenum(VI) Complexes Containing Chiral Ligands: Synthesis and Catalytic Application in Olefin Epoxidation

Synthesis, spectroscopy, thermodynamics and structure of [ZnCl2 (η3-dpktch)] (η3-dpktch = N,N,O- di-2-pyridyl ketone thiophene-2-carboxylic acid hydrazone)

Reactions of Dipyridylketone With Group 8 Metal Carbonyls in Different Media

Contact Info

Product

Resources

About

Synthesis and structure of the first molybdenum compound of N,O,N-hydroxybis(2-pyridyl)methanolato (η ³-dpkO, OH). The structure of [Mo(O)₂(μ-O)(η ³-dpkO,OH)]₂ · 2dmso

Synthesis, spectroscopy, thermodynamics and structure of [ZnCl₂ (η³-dpktch)] (η³-dpktch = N,N,O- di-2-pyridyl ketone thiophene-2-carboxylic acid hydrazone)