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Zoekopdracht: faculteit: "FNWI" en publicatiejaar: "1991"

AuteursA.M. Brouwer, R.D. Mout, P.H. Maassen van den Brink, H.J. van Ramesdonk, J.W. Verhoeven, S.A. Jonker
TitelCharge separation in the excited state of electron donor-acceptor compounds containing the piperazine moiety
TijdschriftChemical physics letters
FaculteitFaculteit der Natuurwetenschappen, Wiskunde en Informatica
Instituut/afd.FNWI: Van 't Hoff Institute for Molecular Sciences (HIMS)
Trefwoordenphotochemistry; piperazine; donor-acceptor systems; electron transfer; absorption spectra
Basisclassificatie35.14 ; 35.16 ; 35.51
SamenvattingThree bridged electron donor—acceptor systems are investigated containing a 4-cyano-1-ethenylnaphthalene electron-acceptor and piperidine (compound 1), phenylpiperazine (2) and 4-methoxyphenylpiperazine (3) electron-donating groups. In the intramolecular charge-transfer states of 1 and 2, the extent of charge separation is similar, but in compound 3 the positive charge is shifted towards the more powerful arylamine donor site, which results in a significantly greater dipole moment. Optical absorption spectra of model radical cations demonstrate that the predominant charge localization on the trialkyl nitrogen in 2 and on the aryl nitrogen in 3 are a consequence of the bistable nature of the piperazine donors.
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