ChemInform Abstract: Charge‐Transfer Complexes (VI)‐(X) of Pyridines (I), (II) with π‐Acceptors

Mahmoud, M. R.; Al-Nady, A.-B. M.; Mohamad, Ayad Ahmed; Salman, Hassan

doi:10.1002/chin.198932068

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1997

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“…Effect of Time on CT Complexation. It was previously shown that CT complexation can be slow, taking minutes to hours to go to completion . We find here that the formation of the observed CT band at 305 nm for 1 ·acceptor displays a time dependency; equilibrium is only reached after 90 min.…”

Section: Resultssupporting

confidence: 49%

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A New Charge Transfer Complex Involving ReH₅(PPh₃)₃

et al. 1997

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A new intermolecular charge transfer (CT) band at 305 nm has been observed in the UV−visible spectrum between ReH5(PPh3)3 and the hydroquinone form of p-chloranil in a mixed CH2Cl2−n-hexanes solution. Formation constants (1600 dm3/mol at 25 °C) have been measured according to a Benesi−Hildebrand treatment and the thermodynamic parameters (−ΔH° = 25.8 kJ/mol; −ΔS° = 25 J/mol; −ΔG° = 18 kJ/mol) have been calculated for this strong CT complexation.

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Section: Resultssupporting

confidence: 49%

“…In the IR spectrum, complete loss of the ν(CO) bands occurs along with the appearance of a ν(OH) band, while in the proton NMR, an OH resonance appears. This could explain the slow formation of presumed CHL CT complexes seen earlier, because many reductants can reduce CHL to CHLH 2 9e…”

Section: Resultsmentioning

confidence: 93%