Charge Transfer Molecular Complexes of Some Pyrazoles withσ‐ andπ‐Electron Acceptors

Autor:	Elham M. Abd-Alla, M. M. A. Hamed, Sh. M. Bayoumi
Rok vydání:	2003
Předmět:	chemistry.chemical_classification Chloranil Ionic bonding Pyrazole Electron acceptor Tetracyanoethylene Photochemistry Acceptor Atomic and Molecular Physics and Optics Analytical Chemistry chemistry.chemical_compound Crystallography Radical ion chemistry Solvent effects Spectroscopy
Zdroj:	Spectroscopy Letters. 36:357-373
ISSN:	1532-2289 0038-7010
DOI:	10.1081/sl-120024584
Popis:	Charge‐transfer (CT) complexes of some pyrazoles with iodine as a σ‐electron acceptor and with 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ), tetracyanoethylene (TCNE), chloranil (CHL) as a π‐electron acceptors were investigated spectroscopically. The spectral characteristics and stability constants of the formed 1: 1 CT complexes were examined and discussed in terms of the donor molecular structure, the nature of the electron acceptor as well as the solvent polarity. It is deduced that the complexes with iodine exist in the ionic structure (pyrazole)2 I+ · I3 − whereas the complex with DDQ is mainly in the dissociated state (radical cation and anion; pyrazole· +, DDQ· −). On the other hand pyrazoles‐TCNE, –CHL complexes are essentially of the nonbonding type (pyrazole‐TCNE, –CHL). Moreover, it is concluded that the solvent polarity plays an important role in determining the stability of these kinds of CT complex. The ionization potentials of the donors were calculated based on the CT transition energie...
Databáze:	OpenAIRE
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