Studies on some reactions of cyclopalladated azobenzenes with N,O-chelators

Bag, K.; Misra, Tarun Kumar; Sinha, Chittaranjan

doi:10.1016/s0277-5387(98)00216-2

Cited by 14 publications

(2 citation statements)

References 24 publications

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“…On the other hand, the reductions occur successively on each half of the chelate azobenzene orthopalladated (CN)Pd···Pd(CN) framework in the cis - 2 case, which is different from the (CN)Pd···Pd(NC) framework in the trans - 2 case. The assignment of azobenzene-based reductions when the ligand is orthopalladated has been reported …”

Section: Electrochemistrymentioning

confidence: 99%

Synthesis, Structure, and Electrochemistry of Mononuclear and Face-to-Face Binuclear Orthometalated Complexes of Palladium(II) with N-Monodentate or N(1),N(3)-Bridging 1,3-Di-p-tolyltriazenido Ligands. Dependence on Geometrical Arrangement of the Electronic Communication between Two Equivalent Redox Sites

et al. 2001

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The synthesis, electrochemistry, and structural characterization of the mononuclear complex [Pd{C6H4N(H)NC(CH3)C5H4N}(p-tolN−NNp-tol)] (1) containing the monodentate 1,3-di-p-tolyltriazenido ligand is described. Compound 1 is an example of a stable species containing a Pd−N amido bond cis to a Pd−C aryl bond. Kinetic parameters for the dynamic intramolecular N(1)−N(3) exchange of the monodentate ligand in complex 1 have been calculated. The cis and trans isomers of the orthometalated face-to-face complex [{Pd(C6H4NNC6H5)(μ-p-tolNNNp-tol)}2] (2) have also been prepared, and the crystal structure of the trans isomer is reported. There are noticeable differences in the electrochemical behavior of the mononuclear and binuclear species. From the electrochemical experiments on both isomers of 2 it is possible to recognize different redox sites, to calculate the electronic coupling between them, and to suggest where the reversible electron transfers occur. Each isomers of 2 undergoes two one-electron oxidations and two one-electron reductions. The electronic coupling (ΔE = 0.40 V) at oxidizing potentials is identical for both isomers of complex 2, suggesting that the oxidations occur on the Pd(μ-triazenido)2Pd framework which is common to both isomers. By contrast, the electronic coupling at reducing potentials is greater for cis-2 (ΔE = 0.33 V) than for trans-2 (ΔE = 0.25 V), suggesting that the reduction processes occur on the orthopalladated fragments, which are arranged differently on the two isomers. Thus, electronic communication between two equivalent redox centers in the same molecule depends not only on the nature of the bridging ligand but also on the geometrical arrangement of the redox centers.

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Section: Electrochemistrymentioning

confidence: 99%

Synthesis, Structure, and Electrochemistry of Mononuclear and Face-to-Face Binuclear Orthometalated Complexes of Palladium(II) with N-Monodentate or N(1),N(3)-Bridging 1,3-Di-p-tolyltriazenido Ligands. Dependence on Geometrical Arrangement of the Electronic Communication between Two Equivalent Redox Sites

et al. 2001

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“…However, the absorption arising from the N=N stretching vibration of aromatic azo compounds is weak and occurs in the same region as the absorption arising from the aromatic ring vibrations. Due to this, it is also hard to distinguish the band corresponding to m(N=N) at 1360-1385 cm -1 [40].…”

Section: Ir Spectrummentioning

confidence: 99%

Synthesis, structural characterization and thermal studies of a novel reagent 1-[(5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol

Tupys

Kalembkiewicz

Ostapiuk

et al. 2016

J Therm Anal Calorim

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A new thiazolylazo reagent 1-[(5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol has been synthesized via arylation of acrolein and further diazotization and diazocoupling with 2-naphthol. The chemical structure of the compound was confirmed by IR, NMR: 1 H, 13 C, COSY, HSQC and SALDI-MS spectral data. The DSC method was employed to determine the melting point and the enthalpy of fusion (T fus = 159.7°C and DH fus = 28.0 kJ mol -1 , respectively). Thermal stability and decomposition studies of the obtained azo dye were performed in air and nitrogen atmosphere using the TG technique. The evolved gases from the heated sample were registered on FTIR spectra. The decomposition of the azo dye in air atmosphere occurred in five consecutive stages. The pK a ionization constants of the substance were determined in ethanol-water mixture (1:1 v/v) by means of the spectroscopic method and were found to be equal to 0.41 for pK a1 and 9.59 for pK a2 . Using the spectrophotometric procedures, the methods for determination of trace amounts of toxic metallic ions with the new reagent were characterized and limits of detection were calculated.

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Palladium–Carbon σ-Bonded Complexes

Elsevier

Eberhard

2007

Comprehensive Organometallic Chemistry III

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Studies on some reactions of cyclopalladated azobenzenes with N,O-chelators

Cited by 14 publications

References 24 publications

Synthesis, structural characterization and thermal studies of a novel reagent 1-[(5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol

Palladium–Carbon σ-Bonded Complexes

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