Molybdenum complexes with tridentate NS2 ligands. Synthesis, crystal structures and spectroscopic properties

Stelzig, Lutz; Kötte, Stephan; Krebs, Bernt

doi:10.1039/a802334d

Cited by 36 publications

(22 citation statements)

References 15 publications

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“…The geometry is distorted octahedral for 10-12 with cis-MoO 2 moiety. In dinuclear complex 18 [78], the ligand is tridentate dinegative (deprotonation of SH and N 2 H groups), and the geometry is distorted square pyramidal with anti -Mo V 2 O 3 group. Dichloromethane is present as a solvent of crystallization.…”

Section: Molybdenummentioning

confidence: 99%

“…A series of mononuclear Mo compounds (in VI oxidation state) viz., 10-17, as well as dimers, 18 and 19 have been reported (Chart 3) [77][78][79]145,146]. These were prepared by reacting MoO 2 (acac) 2 or MoO 2 Cl 2 with a thiosemicarbazone in ethanol.…”

Section: Molybdenummentioning

confidence: 99%

“…For molybdenum, MoO 2 (acac) 2 is used as a starting material, the acac anion is replaced by the thiosemicarbazone ligand during complexation [77][78][79]. For W, Tc and Re complexes, metal carbonyls, W(CO) 6 [80,81], (NEt 4 ) 2 Tc(CO) 3 Cl 3 [82], and ReX(CO) 3 (CH 3 CN) 2 [83,84], have been used as precursors.…”

Section: Synthesismentioning

confidence: 99%

See 2 more Smart Citations

Bonding and structure trends of thiosemicarbazone derivatives of metals—An overview

Lobana¹,

Sharma²,

Bawa³

et al. 2009

Coordination Chemistry Reviews

602

332

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Section: Molybdenummentioning

confidence: 99%

Section: Molybdenummentioning

confidence: 99%

See 1 more Smart Citation

Bonding and structure trends of thiosemicarbazone derivatives of metals—An overview

Lobana¹,

Sharma²,

Bawa³

et al. 2009

Coordination Chemistry Reviews

602

332

View full text Add to dashboard Cite

“…Solvents were dried by standard methods and degassed prior to use. The compounds 4-triphenylmethyl-thiosemicarbazide [19], 4-formyl-3-methyl-1-phenyl-5-sulfanylpyrazole [20] and 2-mercaptoacetophenone-4-triphenylmethylthiosemicarbazone [21] were prepared according to the literature. Elemental analyses were carried out at the Institute of Organic Chemistry, University of Münster by using a Perkin-Elmer 240 Elemental Analyser.…”

Section: Methodsmentioning

confidence: 99%

Investigations on Structural and Electrochemical Properties of Some Disulfides Prepared by Schiff Base Reactions

Kötte

Jolk

Krebs³

2000

J. prakt. Chem.

Self Cite

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Four different disulfides, [2,2′‐dithiobis‐(2‐mercaptoacetophenone)]‐4‐triphenylmethylthiosemicarbazone (1), [5,5′‐dithiobis‐(4‐formyl‐3‐methyl‐1‐phenylpyrazole)]‐4‐triphenylmethylthiosemicarbazone (2), bis[1‐(2‐mercaptophenyl)‐2‐(4‐(1‐phenyl‐3‐methyl)pyrazole)‐azaethene]di‐sulfide (3) and bis[1‐phenyl‐2‐(4‐(1‐phenyl‐3‐methyl‐5‐mercapto) pyrazole)‐azaethene]disulfide (4) were synthesized by Schiff base reactions. Their electrochemical behaviour was examined by cyclic voltammetry. The results show low potentials for the disulfide reduction so that these compounds are suitable for the syntheses of tridentate thiolate ligands from disulfides by electrochemical cleavage. In addition compounds 2 and 4 were characterized by X‐ray structure determination. The structures show significant differences of the S—S bonds and angles as compared to other disulfides without bulky substituents.

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“…[24] In particular, thiosemicarbazones derived from salicylaldehydes allow a systematic investigation of the effect of electron-withdrawing groups (EWGs) or electron-donating groups (EDGs) on the electronic properties of a coordinated molybdenum center. It was found that these electronic trends are reflected in the spectroscopic properties of the molybdenum complexes formed, [18,25] and in their catalytic, [26] biological, [27,28] and pharmacological properties. [29,30] Here we present the synthesis, characterization and catalytic OAT activity of a series of cis-dioxomolybdenum(VI) complexes with structurally related tridentate thiosemicarbazone ligands (Scheme 2).…”

Section: Introductionmentioning

confidence: 99%

Electronic Fine‐Tuning of Oxygen Atom Transfer Reactivity of cis‐Dioxomolybdenum(VI) Complexes with Thiosemicarbazone Ligands

et al. 2015

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A series of six cis‐dioxomolybdenum(VI) complexes with thiosemicarbazone ligands was synthesized and characterized. The ligands were obtained by reacting ethyl thiosemicarbazide with salicylaldehydes substituted with a selection of electron‐withdrawing and electron‐donating groups. The crystal structures, IR, NMR spectroscopic data and oxygen atom transfer activities of the complexes revealed that the electronic effects of the substituents located in the para‐position of the phenolate donor are transmitted through to the molybdenum center, as reflected by linear relationships between Hammett constants and key properties of the complexes, including the molybdenum–phenolate bond lengths and the coordination shift of the imine proton resonance. Compared with the unsubstituted catalyst, electron‐withdrawing substituents increase the rate of oxygen atom transfer from dimethyl sulfoxide to triphenylphosphine, whereas electron‐donating groups have the opposite effect. The highest rate enhancement was achieved through the introduction of a strongly electron‐withdrawing NO2 substituent in the p‐position of the phenolate donor.

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Molybdenum complexes with tridentate NS2 ligands. Synthesis, crystal structures and spectroscopic properties

Cited by 36 publications

References 15 publications

Bonding and structure trends of thiosemicarbazone derivatives of metals—An overview

Bonding and structure trends of thiosemicarbazone derivatives of metals—An overview

Investigations on Structural and Electrochemical Properties of Some Disulfides Prepared by Schiff Base Reactions

Electronic Fine‐Tuning of Oxygen Atom Transfer Reactivity of cis‐Dioxomolybdenum(VI) Complexes with Thiosemicarbazone Ligands

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