Charge-transfer spectra of pyrylium iodides

Balaban, Alexandrù T.; Mocanu, Mihaela I.; Simon, Zeno

doi:10.1016/s0040-4020(01)98403-0

Cited by 38 publications

(7 citation statements)

References 32 publications

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“…In the B2N3 ring, the BN bonds are longer (1.30-1.460 A), whereas the NN bond is short, 1.394 A, suggesting a relatively high double bond character. From this structural study, it seems that aromatic character of the B2N3 ring is not higher than that of B3N2 ring contrary to what has been claimed before [33]. According to these calculations, the five membered unsaturated boron-nitrogen compounds do not obey the 4N + 2 Hiickel rule.…”

Section: B Odd Numbered Boron-nitrogen Compoundscontrasting

confidence: 69%

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Quantum study of the ground state of a series of unsaturated boron–nitrogen compounds by the MNDO method. I. Geometries and stabilities

Maouche

Gayoso

1983

Int J of Quantum Chemistry

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A MNDO study of molecular geometries, enthalpies, formation, atomization, bond separation, and hydrogenation of a series of unsaturated boron-nitrogen compounds, linear with two and three members and cyclic with three, four, five, and six members are presented. For all these molecules, MNDO calculations are in excellent agreement with available ab initio calculations or experimental data. The high rotational barrier in aminoborane HlBNH2, 30.6 kcal/mol, and the length of bond in iminoborane HBNH, 1.1 83 A, imply strong double and triple BN bond character in these two molecules. In the odd membered heterocycles, examination of the molecular geometries and energies of equilibrium states shows that in all cases, the stability of the compounds grows with the number of boron atoms and decreases with that of the nitrogen atoms. Moreover, compared study of the two BN-fulvenes with their homologous hydrocarbon shows that only BN (BB)-fulvene has a polyenic structure similar to that of fulvene.

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Section: B Odd Numbered Boron-nitrogen Compoundscontrasting

confidence: 69%

“…The possibility of aromatic delocalization in the five membered rings B2N3 and B3N2 [30,31] has been discussed and their relative aromaticity subjected to contrary claims [4,32,33]. However, the geometrical aspect of their structure has never been studied.…”

Section: B Odd Numbered Boron-nitrogen Compoundsmentioning

confidence: 99%

Quantum study of the ground state of a series of unsaturated boron–nitrogen compounds by the MNDO method. I. Geometries and stabilities

Maouche

Gayoso

1983

Int J of Quantum Chemistry

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“…The extensive work on pyridinium iodides has provided a comprehensive example of IPCT between aromatic cations and iodide. Other aromatic cations such as pyrylium, trans -styrylpyridinium, and tropylium , have also been shown to undergo IPCT with halides. For example, the chloride, bromide, and iodide salts of tropylium have been synthesized and studied.…”

Section: Halide-to-acceptor Charge Transfermentioning

confidence: 99%

Halide Photoredox Chemistry

et al. 2019

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Halide photoredox chemistry is of both practical and fundamental interest. Practical applications have largely focused on solar energy conversion with hydrogen gas, through HX splitting, and electrical power generation, in regenerative photoelectrochemical and photovoltaic cells. On a more fundamental level, halide photoredox chemistry provides a unique means to generate and characterize one electron transfer chemistry that is intimately coupled with X−X bond-breaking and -forming reactivity. This review aims to deliver a background on the solution chemistry of I, Br, and Cl that enables readers to understand and utilize the most recent advances in halide photoredox chemistry research. These include reactions initiated through outer-sphere, halide-to-metal, and metal-toligand charge-transfer excited states. Kosower's salt, 1-methylpyridinium iodide, provides an early outer-sphere charge-transfer excited state that reports on solvent polarity. A plethora of new inner-sphere complexes based on transition and main group metal halide complexes that show promise for HX splitting are described. Long-lived charge-transfer excited states that undergo redox reactions with one or more halogen species are detailed. The review concludes with some key goals for future research that promise to direct the field of halide photoredox chemistry to even greater heights. CONTENTS 1. Introduction, Background, and Motivation

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“…eigeneErgebnisse; ") [71; ')[581 Als Referenzanion wiihlten wir fur nichtwaBrige Losungsmittel das iodidion, das gegeniiber dem in Wasser verwendeten Hexacyanoferrat(l1) den Vorteil besitzt, besser losliche Ionenpaare zu bilden und gegen Oxidation durch Luftsauerstoff unempfindlich zu sein. Auch absorbieren die Ionenpaare des Iodids meist genugend langwellig, um eine uberlagerung mit der Eigenabsorption der Kationen zu vermeiden.In den Tab.…”

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Inkrementsystem zur Beschreibung der Lage von Ionenpaar‐Charge‐Transfer‐Banden in Wasser und nichtwäßrigen Lösungsmitteln

1986

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Increment System for Predicting of the Position of Ion Pair Charge‐Transfer Bands in Water and Non‐aqueous Solvents The energy of the absorption maximum of ion‐pair charge‐transfer bands, ΔGCT, occuring in addition to the absorptions of the single ions, is approximately the sum of contributions (increments) of the ions concerned. On the basis of spectroscopic data, an increment system for predicting of ΔGCT in aqueous solution has been proposed. A linear relationship between the increments and the standard electrode potentials of ions has been found, permitting the expansion of the increment system. The difference between calculated and experimental values does not exceed 2500 cm−1. The applicability of the increment system to non‐aqueous solvents has been proved in several cases.

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Charge-transfer spectra of pyrylium iodides

Cited by 38 publications

References 32 publications

Quantum study of the ground state of a series of unsaturated boron–nitrogen compounds by the MNDO method. I. Geometries and stabilities

Quantum study of the ground state of a series of unsaturated boron–nitrogen compounds by the MNDO method. I. Geometries and stabilities

Halide Photoredox Chemistry

Inkrementsystem zur Beschreibung der Lage von Ionenpaar‐Charge‐Transfer‐Banden in Wasser und nichtwäßrigen Lösungsmitteln

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