Luminescence and Resonance Raman Study of Molecular Distortions Caused by Ligand-Centered Transitions in Metal Acetylacetonate Complexes

Wexler, David; Zink, Jeffrey I.

doi:10.1021/ic9501374

Cited by 11 publications

(8 citation statements)

References 22 publications

(25 reference statements)

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“…We explored this possibility and selected the hexafluoroacetylacetonates of Tl þ , Pb 2þ and Bi 3þ for the present study. Metal hexafluoroacetylacetonates show a diagnostic IL phosphorescence around 500 nm with a characteristic vibronic structure [11][12][13]. In the absence of a heavy atom effect this IL phosphorescence appears only at low temperatures (e.g.…”

mentioning

confidence: 99%

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Optical properties of thallium(I), lead(II) and bismuth(III) hexafluoroacetylacetonates. Intraligand phosphorescence under ambient conditions

Strasser

Vogler

2004

Inorganic Chemistry Communications

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confidence: 99%

“…This band is assigned to the lowestenergy spin-allowed pp Ã intraligand (IL) transition of the coordinated hfac ligand. Upon IL excitation Zn(hfac) 2 displays a phosphorescence which originates from the hfac pp Ã triplet [13]. This emission shows a distinct vibronic structure which consists of a maximum near 470 nm.…”

mentioning

confidence: 99%

Optical properties of thallium(I), lead(II) and bismuth(III) hexafluoroacetylacetonates. Intraligand phosphorescence under ambient conditions

Strasser

Vogler

2004

Inorganic Chemistry Communications

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“…35 The band at 265 nm corresponds to the n-π* electronic transitions related to the π-conjugated bonds present in the thenoyl group of TTA. 19 The position of this band did not change after complexation.…”

Section: Electronic Properties: Absorption and Luminescence Studiesmentioning

confidence: 90%

“…7B and C) showed a single broad band with approximately the same onset energy at about 24 000 cm −1 . Wexler et al 19 have shown that the values of onset energy are similar for acac-derived β-diketonates. Small shifts occurred because the substituents (CF 3 , thenoyl and benzoyl rings) perturbed the p orbitals.…”

Section: Electronic Properties: Absorption and Luminescence Studiesmentioning

confidence: 95%

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Synthesis and spectroscopic properties of luminescent tantalum(v)-β-diketonate complexes and their use as optical sensors and the preparation of nanostructured Ta₂O₅

et al. 2015

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This work proposes a simple and inexpensive method to prepare a new series of β-diketonate-tantalum complexes. The method is based on the use of a [TaF7](2-) solution, as the tantalum precursor, thenoyltrifluoroacetone (TTA), hexafluoroacetylacetone (HFA), and benzoyltrifluoroacetylacetone (BFA) in basic medium; basic pH is achieved by adding urea to the reaction medium. Elemental analysis, H(1)-NMR spectroscopy, potentiometric measurements conducted with a fluorine-selective electrode, conductivity measurements, vibrational spectroscopy based on quantum chemistry calculations, and electronic spectroscopy helped in determining the molecular structure of the complexes. At room temperature in the solid state and in solution upon irradiation with UV light, the complexes exhibited blue emission, probably as a result of the heavy atom effect. On the basis of the structures, luminescence properties at room temperature, and solvent-dependent changes in the electronic properties of the complexes, these β-diketonates are potentially applicable as optical ethanol or humidity sensors and are promising materials for the development of luminescent devices.

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Electronic absorption, resonance Raman and excited-state resonance Raman spectroscopy of rhenium(I) and copper(I) complexes, with substituted dipyrido[3,2-a : 2′,3′-c]phenazine ligands, and their electron reduced products

Waterland

Gordon

2000

J. Raman Spectrosc.

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The electronic absorption and resonance Raman spectra of a series of rhenium(I) and copper(I) complexes with substituted dipyrido[3,2-a : 2 ,3 -c]phenazine (dppz) ligands were investigated. The ligands were benzo[i ]dipyrido[3,2-a : 2 ,3 -c]phenazine, 11,12-dimethyldipyrido[3,2-a : 2 ,3 -c]phenazine, 10-methyldipyrido[3,2-a : 2 ,3 -c]phenazine and 11-methyoxydipyrido[3,2-a : 2 ,3 -c]phenazine. The spectroelectrochemistry of the reduced complexes and the emission and resonance Raman spectra of the excited states are reported. Vibrational wavenumber calculations of the unsubstituted ligand suggest the presence of normal modes that are localized to various sections of the ligand structure; the resonance Raman spectra of the complexes are interpreted with reference to these calculations. The analysis of the spectra revealed that the Franck-Condon state initially formed by visible photoexcitation (450 nm) is metal-to-ligand charge-transfer in nature. Spectroelectrochemical resonance Raman and electronic absorption measurements revealed the spectral signatures for the radical anions of each of the ligands used in this study. These spectral features were used to assign the excited states formed by the complexes. Most of the complexes studied show spectral features in their excited-states that suggest that the predominant state formed within 5 ns of excitation is ligand-centred.a See Fig. 1 for numbering scheme. b The values in parentheses show the difference between the corresponding free ligand resonance, i.e. υ(complex) υ(ligand). c Insufficiently soluble in CDCl 3 to obtain a spectrum.

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Luminescence and Resonance Raman Study of Molecular Distortions Caused by Ligand-Centered Transitions in Metal Acetylacetonate Complexes

Cited by 11 publications

References 22 publications

Optical properties of thallium(I), lead(II) and bismuth(III) hexafluoroacetylacetonates. Intraligand phosphorescence under ambient conditions

Optical properties of thallium(I), lead(II) and bismuth(III) hexafluoroacetylacetonates. Intraligand phosphorescence under ambient conditions

Synthesis and spectroscopic properties of luminescent tantalum(v)-β-diketonate complexes and their use as optical sensors and the preparation of nanostructured Ta₂O₅

Electronic absorption, resonance Raman and excited-state resonance Raman spectroscopy of rhenium(I) and copper(I) complexes, with substituted dipyrido[3,2-a : 2′,3′-c]phenazine ligands, and their electron reduced products

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Luminescence and Resonance Raman Study of Molecular Distortions Caused by Ligand-Centered Transitions in Metal Acetylacetonate Complexes

Cited by 11 publications

References 22 publications

Optical properties of thallium(I), lead(II) and bismuth(III) hexafluoroacetylacetonates. Intraligand phosphorescence under ambient conditions

Optical properties of thallium(I), lead(II) and bismuth(III) hexafluoroacetylacetonates. Intraligand phosphorescence under ambient conditions

Synthesis and spectroscopic properties of luminescent tantalum(v)-β-diketonate complexes and their use as optical sensors and the preparation of nanostructured Ta2O5

Electronic absorption, resonance Raman and excited-state resonance Raman spectroscopy of rhenium(I) and copper(I) complexes, with substituted dipyrido[3,2-a : 2′,3′-c]phenazine ligands, and their electron reduced products

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Synthesis and spectroscopic properties of luminescent tantalum(v)-β-diketonate complexes and their use as optical sensors and the preparation of nanostructured Ta₂O₅