Al&met-The formation of charge-transfer complexes can be followed by conductimetric titration. Either a donor solution is titrated with a solution of an acceptor, or vice versa, both using the same solvent. A theory is presented requiring the conductivity to pass through a maximum when donor and acc
Charge-transfer complexes of chlorpromazine in solution: A conductimetric study
β Scribed by F. Gutmann; H. Keyzer
- Publisher
- Elsevier Science
- Year
- 1967
- Tongue
- English
- Weight
- 442 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0013-4686
No coin nor oath required. For personal study only.
β¦ Synopsis
A conductivity titration method has been used to investigate the electron-transfer activity in the charge-transfer complex= formed in a&o&rile between the donor chlorpromazine and the acceptors 2,3_dichloro+-dicyauobeuzoqu@one, tetrachloro-1,4quinone, tetracyanoethylene, and 7,7,8,8_tetracyanoquinodimethane.
The stoichiometry of all these complexes was found to be 1: 1. In general, the conductivity maximum obtained during the complex titration corres onded to the polarographic reduction potential of the acceptor determined in acetonitrile rather tL to it9 absolute electron atEuity Aa.
The anomalous behaviour of the chlorpromazine:tetracyanoethylene complex is probably due to decreased steric hindrance from the chlorpromazine sidechain.
R&mmd-La tendance au transfert au transfert tlectronique des complexes de transfert de charge du donneur chlorpromazine aux accepteurs 2,34ichloro_5,6dicyanobenzoquinone, tetrachloro-1,4benzoquinone, tetracyano&hylene et 7,7,8,8-t&acyanoquinodim&hane, dans l'a&tonitrile, est &ud%e par titration conductim&rique.
La stoechiom&rie de ces complexes est du type 1: 1. Le pit de conductivit6 se manifestant dans la titration correspond g&&alement au potentiel de r&luction polarographique plut8t qu'a l'affinit6 dlectronique absolue, AG. Le comportement tigulier du complexe chlorpromazinetttracyano-&hyl&ne est dfi, probablement, B la diminution de l'emp&hement st&ique de la chaine la&ale de la chlorpromazine.
Z-sung-Die
Elektronen-ubertragungstendenz der EDA Komplexe des Donators Chlorpromazin mit den Akzeptoren 2,3-Dichloro_5,6dicyanobenzochinon, Tetrachloro-1,4chinon, Tetracyaniithylen und 7,7,8,%Tetracyanochinodimethan, in Acetonitril, wurde mittels Leitfiihigkeitstitrationen untersucht. Die StaChiometrie all dieser Komplexe ergab sich als 1: 1. Das bei der Titration auftretende Leifffiigkeitsmaxim um entspricht im allgemeinen, dem polarographischen Reduktionspotential und nicht der absolutem ElektronenaGnitiit AQ. Das abnormale Verhalten des Chlorprornazin Tetracytithylen-Komplexes ist wahrscheinlich durch eine verringerte-Hinderungsterische der Chlorpromazin-Seitenkette-verursacht.
π SIMILAR VOLUMES
Femtosecond transient absorption studies of charge-transfer complexes of 12 with hexamethylbenzene have been performed in a series of noncomplexing solvents. Anisotropy measurements of the bleach of the charge-transfer absorption band indicate that the geometry and electronic structure of the comple
The deactivation mechanism of the excited charge-transfer complex in non-polar and pohr solvents has been discussed on the basis of measured quantum yields and decay times of fluorescence of charge-transfer complexes of pyromellitic dianhydride with some methylbenzenes. It has been pointed out that
To characterize the intramolecular charge-transfer process of DMABN, pica-and nanosecond measurements in different polar solutions and at various temperatures were undertaken. Evidence of (i) timedependent interconversion ntesdescribithe formation of the charg%ransfer state and (ii) fluorescence sol