Fulvenes and Thermochromic Ethylenes, Part 53 The Fine Structure of 2‐Arylmethylene‐1,3‐Indandiones; their Dipole Moments and Electronic Spectra

Weiler‐Feilchenfeld, Hannah; Loewenstein, Ruth M. J.; Agranat, Israel; Bergmann, Ernst D.

doi:10.1002/ijch.196900014

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…2-Ferrocenylmethylene-1,3-indandione has a moment of 2.03 D,176 to be compared to 1.17 for 2-benzylidene-1,3-indandione. 177 In agreement with this the two carbonyl stretching frequencies show a significant shift (Ao, = -12 and Ai>2 = -13 cm-1 in CH2CI2; Ap, = -7 and Aj>2 = -8 cm-1 in CCI4) when compared with 2-benzylidene-1,3-indandione. This evidence led to the suggestion that in the former compound there is a contribution of extreme polar forms having negative charge on the oxygen.…”

Section: A Iron and Chromium Complexessupporting

confidence: 72%

Dielectric behavior and molecular structure of inorganic complexes

Sorriso¹

1980

Chem. Rev.

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Section: A Iron and Chromium Complexessupporting

confidence: 72%

Dielectric behavior and molecular structure of inorganic complexes

Sorriso¹

1980

Chem. Rev.

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“…Absorption spectra of DMABI films of different thickness ( d ), a powder of crystal of α-modification (the optical density of the bulk α-crystals was too high to be measured), and the DMABI solution in n -heptane (10 -5 mol/L) are shown in Figure . The absorption spectra of DMABI solutions were analyzed in previous publications. , It has been shown that the spectrum can be divided into two groups of bands which are of different origin. The bands in the high-energy spectral region (maximum at 5.03 eV) correspond to the absorption of the indandione fragment of the molecule .…”

Section: Resultsmentioning

confidence: 99%

Free and Self-Trapped Charge-Transfer Excitons in Crystals of Dipolar Molecules ofN,N-Dimethylaminobenzylidene 1,3-Indandione

et al. 1998

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In this paper we consider the spectral properties of exciton transitions of N,N-dimethylaminobenzylidene 1,3-indandione (DMABI) films and crystals, which are typical examples of polar molecular compounds. A large dipole moment in the electronic ground state and the considerable change (up to 12 D) of this value by excitation of a free DMABI molecule induce strong polarization of the surroundings, which causes the remarkable self-trapping effects in the crystal. The exciton-phonon coupling value g ) 1.87 is estimated for the crystal. Charge-transfer (CT) exciton formation is observed in the absorption and luminescence spectra by analyzing the spectral behavior at various thicknesses of DMABI films. The CT excitons created along molecular stacks dominate in the spectra of the DMABI crystals. Coexistence of free and self-trapped CT excitons is discovered at elevated temperatures. The exciton band parameters are estimated, and the adiabatic energy potential energy for two self-trapped excitons is suggested. Relaxation paths of shallow short-lived and deeply trapped long-lived self-trapped CT excitons are discussed. Mechanisms of two-photon absorption and photoconductivity of DMABI crystals and films are considered.

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“…Owing to different electron donor and acceptor properties of fragments, an asymmetric charge distribution takes place. The dipolar character , of the DMABI molecule and the excellent photoconductivity 2 ( i photo / i dark = 10 4 −10 5 ) of DMABI crystals have already been discussed in pioneering studies almost 25 year ago. Similar to many carbocyclic and heterocyclic organic compounds, DMABI crystals exhibit well-expressed polymorphism.…”

Section: Introductionmentioning

confidence: 97%

Visible Luminescence of Dimethylaminobenzylidene-1,3-indandione Compounds Excited by Ultrashort Infrared Light Pulses

1996

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The origin of the nonlinear anti-Stokes luminescence effect in dimethylaminobenzylidene-1,3-indandione (DMABI) crystals and vacuum-evaporated films, i.e., the luminescence in the visible spectral region created by the infrared excitation, was investigated by means of the luminescence excitation stimulated by two excitation pulses separated in time and by means of ultrafast pump−probe spectroscopy. In contrast to the earlier proposed luminescence excitation model based on the low-energy exciton annihilation, the luminescence state was found to be excited via two-photon absorption through the virtual and real (characterized by 1 ps lifetime) intermediate states. Second harmonic generation and the pulse duration effect on the nonlinear luminescence are discussed. The exciton−exciton annihilation on a luminescent state manifold was observed at high excitation intensities.

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Fulvenes and Thermochromic Ethylenes, Part 53 The Fine Structure of 2‐Arylmethylene‐1,3‐Indandiones; their Dipole Moments and Electronic Spectra

Cited by 9 publications

References 6 publications

Dielectric behavior and molecular structure of inorganic complexes

Dielectric behavior and molecular structure of inorganic complexes

Free and Self-Trapped Charge-Transfer Excitons in Crystals of Dipolar Molecules ofN,N-Dimethylaminobenzylidene 1,3-Indandione

Visible Luminescence of Dimethylaminobenzylidene-1,3-indandione Compounds Excited by Ultrashort Infrared Light Pulses

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