Electronic and magnetic circular dichroism spectra

Isci, Huseyin; Mason, W. Roy

doi:10.1021/ic00197a006

Cited by 43 publications

(24 citation statements)

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“…This is consistent with consistent with their assignment 7,8 to transitions to spin-orbit induced admixtures of the 1 ⌺ 0ϩu and 3 ⌸ 0ϩu states, with the oscillator strength coming from the 1 ⌺ 0ϩu component. The upper band is clearly narrower than the lower band, even taking into account the possibility of photodetachment competing with photodissociation below 293 nm, because the upper band is narrower on both sides of its maximum at 290 nm.…”

Section: A Pfy Spectrumsupporting

confidence: 92%

Photodissociation dynamics of the triiodide anion (I3−)

Choi

Bise

Hoops

et al. 2000

The Journal of Chemical Physics

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The spectroscopy and dissociation dynamics of I 3 Ϫ were investigated using fast beam photofragment translational spectroscopy. The photofragment yield of I 3Ϫ from 420 to 240 nm was measured, yielding two broadbands at the same energies as in the absorption spectrum of I 3 Ϫ in solution. Photodissociation dynamics measurements performed with two-particle time-and-position sensitive detection revealed two product mass channels having photofragment mass ratios of 1:2 and 1:1. Both channels were seen at all photolysis wavelengths. Translational energy distributions show that the 1:2 products are from a combination of I( 2 P 3/2 )ϩI 2 Ϫ and I*( 2 P 1/2 )ϩI 2 Ϫ . The 1:1 mass channel is from symmetric three-body dissociation to I Ϫ ϩ2I.

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Section: A Pfy Spectrumsupporting

confidence: 92%

Photodissociation dynamics of the triiodide anion (I3−)

Choi

Bise

Hoops

et al. 2000

The Journal of Chemical Physics

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“…However, the HOMO in I 3 Ϫ is a nonbonding u orbital with a node at the central I atom. 30 Thus, regardless of whether the Ar atom is bonded to the central I atom or one of the end atoms, its overall interaction with the excess charge on the I 3 Ϫ should be weaker than in Ar•I Ϫ or Ar•I 2 Ϫ , consistent with the experimental results.…”

Section: Discussionsupporting

confidence: 79%

Characterization of the I3 radical by anion photoelectron spectroscopy

Taylor

Asmis

Zanni

et al. 1999

The Journal of Chemical Physics

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Articles you may be interested inSlow photoelectron velocity-map imaging spectroscopy of the C9H7 (indenyl) and C13H9 (fluorenyl) anions Photoelectron spectroscopy of higher bromine and iodine oxide anions: Electron affinities and electronic structures of BrO2,3 and IO2-4 radicals Slow photoelectron velocity-map imaging spectroscopy of the vinoxide anion Potential curves and spectroscopic properties for the ground state of ClO and for the ground and various excited states of ClO − The ground and first excited states of the I 3 radical are characterized by photoelectron spectroscopy of I 3Ϫ and Ar•I 3 Ϫ at 266 nm. The electron affinity of I 3 is 4.226Ϯ0.013 eV. Based on the recently determined bond dissociation energy of I 3 Ϫ , the I 3 ground state is bound by 0.143Ϯ0.06 eV. The first excited state of I 3 lies 0.27 eV above the ground state. A vibrational progression is seen in the ground state band of the I 3 Ϫ photoelectron spectrum. The addition of an argon atom to I 3 Ϫ reduces the contribution of hot bands to the photoelectron spectrum, facilitating the interpretation of the vibrational structure. Simulations indicate that the I 3 ground state is linear with a symmetric stretch frequency of 115Ϯ5 cm Ϫ1 and is likely to be centrosymmetric.

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“…Solutions of the I 3 -anion formed by reaction between I 2 and (n-C 4 H 9 ) 4 NI in CH 3 CN were shown to exhibit strong absorptions at 292 and 363 nm (with extinction coefficients of 45900 and 25400 L mol -1 cm -1 ) and an extremely weak one at 531 nm (with an extinction coefficient of not more than 155 L mol -1 cm -1 ). [19] If the I 3 -anions were formed in solutions of I 2 and KI in 0.050  KI and 0.010  HClO 4 , the band positions (now 287, 353 and 535 nm) and extinction coefficients (41400, 25300 and 144 L mol -1 cm -1 ) vary slightly. A problem encountered in the determination of the precise extinction coefficient is the equilibrium between I 3 -and I 2 + I -(around 15-20 % of the I 3 -molecules dissociate).…”

Section: +mentioning

confidence: 99%

1,2,4,5‐Tetrakis(tetramethylguanidino)benzene: Synthesis and Properties of a New Molecular Electron Donor

2008

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The molecular electron donor 1,2,4,5-tetrakis(tetramethylguanidino)benzene (ttmgb) was synthesised by reaction between 1,2,4,5-tetraaminobenzene and 2-chloro-1,1Ј,3,3Ј-tetramethylformamidinium chloride. Protonation and oxidation of the molecule were analysed. In the course of titration of initially yellow-coloured solutions of ttmgb with HCl intense and fully reversible colour changes were observed; the diand tetraprotonated forms are green-and blue-coloured, respectively. The tetraprotonated molecule crystallised with Cl -, and the diprotonated molecule crystallised with PF 6 -as counterions. Oxidation, which already occurs slowly in air, was followed by CV measurements. Oxidation with I 2 leads to deeply green-coloured solutions, from which purple-black

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Electronic and magnetic circular dichroism spectra

Cited by 43 publications

References 0 publications

Photodissociation dynamics of the triiodide anion (I3−)

Photodissociation dynamics of the triiodide anion (I3−)

Characterization of the I3 radical by anion photoelectron spectroscopy

1,2,4,5‐Tetrakis(tetramethylguanidino)benzene: Synthesis and Properties of a New Molecular Electron Donor

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