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Chittaranjan Sinha - One of the best experts on this subject based on the ideXlab platform.
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ruthenium ii carbonyl complexes with n 2 pyridyl methyliden α β Aminonaphthalene synthesis spectroscopic studies and dft calculation
Journal of Molecular Structure, 2013Co-Authors: Shyamal Kumar Sarkar, Mahendra Sekhar Jana, Tapan Kumar Mondal, Chittaranjan SinhaAbstract:Abstract Reaction of RuH(Cl)(CO)(PPh 3 ) 3 with bidentate Schiffs base ligands, N-[(2-pyridyl)methyliden]-α/β-Aminonaphthalene ( L 1 / L 2 ) led to the formation of photoluminescence ruthenium carbonyl complexes formulated as [RuCl(CO)(PPh 3 ) 2 (L 1 /L 2 )](PF 6 ) ( 1a / 1b ) and [RuH(CO)(PPh 3 ) 2 (L 1 /L 2 )](PF 6 ) ( 2a / 2b ) [ L 1 = N-[(2-pyridyl)methyliden]-α-Aminonaphthalene and L 2 = N-[(2-pyridyl)methyliden]-β-Aminonaphthalene]. The complexes have been characterized by analytical and spectroscopic (IR, UV–Vis and 1 H NMR) techniques. The complexes exhibit a MLCT band in the visible region and are emissive in room temperature. The cyclic voltammetric study shows Ru(II)/Ru(III) quasi reversible one electron oxidation couple in the range 0.95–1.15 V. The single crystal X-ray structure of 2a shows distorted octahedral geometry around ruthenium atom. DFT calculations are employed to study the structural and electronic features and to support the spectroscopic data.
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Ruthenium(II) carbonyl complexes with N-[(2-pyridyl)methyliden]-(α/β)-Aminonaphthalene: Synthesis, spectroscopic studies and DFT calculation
Journal of Molecular Structure, 2013Co-Authors: Shyamal Kumar Sarkar, Mahendra Sekhar Jana, Tapan Kumar Mondal, Chittaranjan SinhaAbstract:Abstract Reaction of RuH(Cl)(CO)(PPh 3 ) 3 with bidentate Schiffs base ligands, N-[(2-pyridyl)methyliden]-α/β-Aminonaphthalene ( L 1 / L 2 ) led to the formation of photoluminescence ruthenium carbonyl complexes formulated as [RuCl(CO)(PPh 3 ) 2 (L 1 /L 2 )](PF 6 ) ( 1a / 1b ) and [RuH(CO)(PPh 3 ) 2 (L 1 /L 2 )](PF 6 ) ( 2a / 2b ) [ L 1 = N-[(2-pyridyl)methyliden]-α-Aminonaphthalene and L 2 = N-[(2-pyridyl)methyliden]-β-Aminonaphthalene]. The complexes have been characterized by analytical and spectroscopic (IR, UV–Vis and 1 H NMR) techniques. The complexes exhibit a MLCT band in the visible region and are emissive in room temperature. The cyclic voltammetric study shows Ru(II)/Ru(III) quasi reversible one electron oxidation couple in the range 0.95–1.15 V. The single crystal X-ray structure of 2a shows distorted octahedral geometry around ruthenium atom. DFT calculations are employed to study the structural and electronic features and to support the spectroscopic data.
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palladium ii complexes of n 2 pyridyl methyliden α or β Aminonaphthalene single crystal x ray structure of di chloro n 2 pyridyl methyliden β Aminonaphthalene palladium ii pd β naipy cl2 spectra and dft td dft study
Polyhedron, 2007Co-Authors: P Pratihar, Tapan Kumar Mondal, Golam Mostafa, Chittaranjan SinhaAbstract:Palladium(II) complexes of N -[(2-pyridyl)methyliden]-α(or β)-Aminonaphthalene (α or β-NaiPy) are reported in this work. They are spectroscopically characterized along with some mixed ligand complexes, using diimine and azoimine functions. The single crystal X-ray structure of [Pd( N -(2-pyridyl)methyliden-β-Aminonaphthalene)Cl 2 ] has been determined. Luminescence properties of the complexes exhibit a ligand centered π–π ∗ emission. Quantum yields ( ϕ ) have been calculated and it has been observed that the complexes of α-NaiPy show higher ϕ values than the complexes of β-NaiPy. Lifetime measurements suggest bi-exponential decay and the average fluorescence lifetime varies from 1.4 to 6.8 ns. The spectroscopic properties are correlated with DFT and TD-DFT calculations in two complexes, Pd(β-NaiPy)X 2 (X = Cl, I) and they are compared with the free ligand results.
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Palladium(II) complexes of N-[(2-pyridyl)methyliden]-α(or β)-Aminonaphthalene: Single crystal X-ray structure of di-chloro-N-[{(2-pyridyl)methyliden}-β-Aminonaphthalene]palladium(II), Pd(β-NaiPy)Cl2, spectra and DFT, TD-DFT study
Polyhedron, 2007Co-Authors: P Pratihar, Tapan Kumar Mondal, Golam Mostafa, Chittaranjan SinhaAbstract:Palladium(II) complexes of N -[(2-pyridyl)methyliden]-α(or β)-Aminonaphthalene (α or β-NaiPy) are reported in this work. They are spectroscopically characterized along with some mixed ligand complexes, using diimine and azoimine functions. The single crystal X-ray structure of [Pd( N -(2-pyridyl)methyliden-β-Aminonaphthalene)Cl 2 ] has been determined. Luminescence properties of the complexes exhibit a ligand centered π–π ∗ emission. Quantum yields ( ϕ ) have been calculated and it has been observed that the complexes of α-NaiPy show higher ϕ values than the complexes of β-NaiPy. Lifetime measurements suggest bi-exponential decay and the average fluorescence lifetime varies from 1.4 to 6.8 ns. The spectroscopic properties are correlated with DFT and TD-DFT calculations in two complexes, Pd(β-NaiPy)X 2 (X = Cl, I) and they are compared with the free ligand results.
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group 6 tetracarbonyl complexes of n 2 pyridyl methyliden α or β Aminonaphthalene spectral characterization electrochemistry solvatochromism and photophysical studies
Polyhedron, 2007Co-Authors: Papia Datta, Chittaranjan SinhaAbstract:Abstract A new series of group 6 carbonyl complexes of N -[(2-pyridyl)methyliden]-α (or β)-Aminonaphthalene (α/β-NaiPy) are described in this work. The complexes are formulated as cis -[M(CO) 4 (α/β-NaiPy)] by elemental, mass and other spectroscopic data. The complexes show emission spectra at room temperature and their quantum yield lies between 0.4 and 0.5. All the complexes exhibit negative solvatochromism. Cyclic voltammetry shows metal centred oxidation and ligand reductions.
Shyh-chyun Yang - One of the best experts on this subject based on the ideXlab platform.
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peg 4000 promoted palladium catalyzed n allylation in water Aminonaphthalene as an example
ChemInform, 2013Co-Authors: Chunjen Shih, Yi-jen Shue, Shiangyu Yang, Shyh-chyun YangAbstract:Addition of polyethylene glycol 4000 provides a significant improvement of the recently published protocol for N-(mono)allylation of 1-Aminonaphthalene.
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PEG‐4000‐Promoted Palladium‐Catalyzed N‐Allylation in Water: Aminonaphthalene as an Example.
ChemInform, 2013Co-Authors: Chunjen Shih, Yi-jen Shue, Shiangyu Yang, Shyh-chyun YangAbstract:Addition of polyethylene glycol 4000 provides a significant improvement of the recently published protocol for N-(mono)allylation of 1-Aminonaphthalene.
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peg 4000 promoted palladium catalyzed n allylation in water Aminonaphthalene as an example
Applied Organometallic Chemistry, 2012Co-Authors: Chunjen Shih, Yi-jen Shue, Shiangyu Yang, Shyh-chyun YangAbstract:An environmentally friendly, efficient catalytic process using palladium associated with ligands in a PEG4000–water system leading to N-allylation was described in this study. PEG-4000 was found to improve the palladium-catalyzed allylic amination of allylic acetates with Aminonaphthalenes and gave overall good to high yields of the corresponding N-allylic Aminonaphthalenes. Copyright © 2012 John Wiley & Sons, Ltd.
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Simple Palladium-Catalyzed C—N Bond Formation for Poor Nucleophilicity of Aminonaphthalenes.
ChemInform, 2012Co-Authors: Yi-jen Shue, Shyh-chyun YangAbstract:The reaction of various Aminonaphthalenes and phenothiazine with allyl acetate is first investigated and then extended to 1-Aminonaphthalene and different types of allylic acetate substrates.
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Simple palladium‐catalyzed C–N bond formation for poor nucleophilicity of Aminonaphthalenes
Applied Organometallic Chemistry, 2011Co-Authors: Yi-jen Shue, Shyh-chyun YangAbstract:Aromatic amines is not used commonly in allylic amination, presumably because of their less nucleophilic nature compared with the more extensively used benzylamine or relatively stable anionic nitrogen nucleophiles. An eco-friendly method for C–O bond activation of allylic acetates using palladium associated with ligands in water leading to N-allylation was described in this study. The palladium-catalyzed allylic amination of allylic acetate with Aminonaphthalenes gave 34–95% yields to the corresponding N-allylic Aminonaphthalenes. Copyright © 2011 John Wiley & Sons, Ltd.
Haruo Shizuka - One of the best experts on this subject based on the ideXlab platform.
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solvent dependent radiationless transitions of excited 1 Aminonaphthalene derivatives
Journal of Physical Chemistry A, 1997Co-Authors: K Suzuki, H Tanabe, And Seiji Tobita, Haruo ShizukaAbstract:Photophysical parameters in the excited singlet states of a series of 1-Aminonaphthalene derivatives in cyclohexane, 3-methylpentane, and acetonitrile have been determined by means of time-resolved and steady-state fluorometry and time-resolved thermal lensing technique with the aid of MO calculations to elucidate the mechanism of internal fluorescence quenching of 1-Aminonaphthalenes observed in nonpolar media. It is revealed that (1) the radiationless processes in nonpolar solvents are mainly due to fast internal conversion (IC; Φic = 0.97, kic = 8.1 × 109 s-1 for N,N-dimethyl-1-Aminonaphthalene (DMAN) in cyclohexane at 293 K), (2) the fast IC occurs predominantly in the compounds having a pretwisted and flexible amino group with respect to the naphthalene ring, and the rate remarkably depends on temperature (the activation energy for the temperature dependent IC process of DMAN in 3-methylpentane is 5.1 kcal mol-1), indicating that the IC process is linked with an internal twisting motion of the amino ...
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Solvent-Dependent Radiationless Transitions of Excited 1-Aminonaphthalene Derivatives †
Journal of Physical Chemistry A, 1997Co-Authors: K Suzuki, H Tanabe, And Seiji Tobita, Haruo ShizukaAbstract:Photophysical parameters in the excited singlet states of a series of 1-Aminonaphthalene derivatives in cyclohexane, 3-methylpentane, and acetonitrile have been determined by means of time-resolved and steady-state fluorometry and time-resolved thermal lensing technique with the aid of MO calculations to elucidate the mechanism of internal fluorescence quenching of 1-Aminonaphthalenes observed in nonpolar media. It is revealed that (1) the radiationless processes in nonpolar solvents are mainly due to fast internal conversion (IC; Φic = 0.97, kic = 8.1 × 109 s-1 for N,N-dimethyl-1-Aminonaphthalene (DMAN) in cyclohexane at 293 K), (2) the fast IC occurs predominantly in the compounds having a pretwisted and flexible amino group with respect to the naphthalene ring, and the rate remarkably depends on temperature (the activation energy for the temperature dependent IC process of DMAN in 3-methylpentane is 5.1 kcal mol-1), indicating that the IC process is linked with an internal twisting motion of the amino ...
Yi-jen Shue - One of the best experts on this subject based on the ideXlab platform.
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peg 4000 promoted palladium catalyzed n allylation in water Aminonaphthalene as an example
ChemInform, 2013Co-Authors: Chunjen Shih, Yi-jen Shue, Shiangyu Yang, Shyh-chyun YangAbstract:Addition of polyethylene glycol 4000 provides a significant improvement of the recently published protocol for N-(mono)allylation of 1-Aminonaphthalene.
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PEG‐4000‐Promoted Palladium‐Catalyzed N‐Allylation in Water: Aminonaphthalene as an Example.
ChemInform, 2013Co-Authors: Chunjen Shih, Yi-jen Shue, Shiangyu Yang, Shyh-chyun YangAbstract:Addition of polyethylene glycol 4000 provides a significant improvement of the recently published protocol for N-(mono)allylation of 1-Aminonaphthalene.
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peg 4000 promoted palladium catalyzed n allylation in water Aminonaphthalene as an example
Applied Organometallic Chemistry, 2012Co-Authors: Chunjen Shih, Yi-jen Shue, Shiangyu Yang, Shyh-chyun YangAbstract:An environmentally friendly, efficient catalytic process using palladium associated with ligands in a PEG4000–water system leading to N-allylation was described in this study. PEG-4000 was found to improve the palladium-catalyzed allylic amination of allylic acetates with Aminonaphthalenes and gave overall good to high yields of the corresponding N-allylic Aminonaphthalenes. Copyright © 2012 John Wiley & Sons, Ltd.
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Simple Palladium-Catalyzed C—N Bond Formation for Poor Nucleophilicity of Aminonaphthalenes.
ChemInform, 2012Co-Authors: Yi-jen Shue, Shyh-chyun YangAbstract:The reaction of various Aminonaphthalenes and phenothiazine with allyl acetate is first investigated and then extended to 1-Aminonaphthalene and different types of allylic acetate substrates.
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Simple palladium‐catalyzed C–N bond formation for poor nucleophilicity of Aminonaphthalenes
Applied Organometallic Chemistry, 2011Co-Authors: Yi-jen Shue, Shyh-chyun YangAbstract:Aromatic amines is not used commonly in allylic amination, presumably because of their less nucleophilic nature compared with the more extensively used benzylamine or relatively stable anionic nitrogen nucleophiles. An eco-friendly method for C–O bond activation of allylic acetates using palladium associated with ligands in water leading to N-allylation was described in this study. The palladium-catalyzed allylic amination of allylic acetate with Aminonaphthalenes gave 34–95% yields to the corresponding N-allylic Aminonaphthalenes. Copyright © 2011 John Wiley & Sons, Ltd.
K Suzuki - One of the best experts on this subject based on the ideXlab platform.
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solvent dependent radiationless transitions of excited 1 Aminonaphthalene derivatives
Journal of Physical Chemistry A, 1997Co-Authors: K Suzuki, H Tanabe, And Seiji Tobita, Haruo ShizukaAbstract:Photophysical parameters in the excited singlet states of a series of 1-Aminonaphthalene derivatives in cyclohexane, 3-methylpentane, and acetonitrile have been determined by means of time-resolved and steady-state fluorometry and time-resolved thermal lensing technique with the aid of MO calculations to elucidate the mechanism of internal fluorescence quenching of 1-Aminonaphthalenes observed in nonpolar media. It is revealed that (1) the radiationless processes in nonpolar solvents are mainly due to fast internal conversion (IC; Φic = 0.97, kic = 8.1 × 109 s-1 for N,N-dimethyl-1-Aminonaphthalene (DMAN) in cyclohexane at 293 K), (2) the fast IC occurs predominantly in the compounds having a pretwisted and flexible amino group with respect to the naphthalene ring, and the rate remarkably depends on temperature (the activation energy for the temperature dependent IC process of DMAN in 3-methylpentane is 5.1 kcal mol-1), indicating that the IC process is linked with an internal twisting motion of the amino ...
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Solvent-Dependent Radiationless Transitions of Excited 1-Aminonaphthalene Derivatives †
Journal of Physical Chemistry A, 1997Co-Authors: K Suzuki, H Tanabe, And Seiji Tobita, Haruo ShizukaAbstract:Photophysical parameters in the excited singlet states of a series of 1-Aminonaphthalene derivatives in cyclohexane, 3-methylpentane, and acetonitrile have been determined by means of time-resolved and steady-state fluorometry and time-resolved thermal lensing technique with the aid of MO calculations to elucidate the mechanism of internal fluorescence quenching of 1-Aminonaphthalenes observed in nonpolar media. It is revealed that (1) the radiationless processes in nonpolar solvents are mainly due to fast internal conversion (IC; Φic = 0.97, kic = 8.1 × 109 s-1 for N,N-dimethyl-1-Aminonaphthalene (DMAN) in cyclohexane at 293 K), (2) the fast IC occurs predominantly in the compounds having a pretwisted and flexible amino group with respect to the naphthalene ring, and the rate remarkably depends on temperature (the activation energy for the temperature dependent IC process of DMAN in 3-methylpentane is 5.1 kcal mol-1), indicating that the IC process is linked with an internal twisting motion of the amino ...
