naa a22 4500 510735169 CHVBK 20180411083007.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1007/s12039-013-0390-1 doi (NATIONALLICENCE)springer-10.1007/s12039-013-0390-1 β -pyrrole substituted porphyrin-pyrene dyads using vinylene spacer: Synthesis, characterization and photophysical properties [Elektronische Daten] [P REETA, RAVI KANAPARTHI, L GIRIBABU] We have designed and synthesized donor-acceptor conjugates having donor pyrene at the pyrrole-β position of either free-base porphyrin or Zn(II) porphyrin using vinylene spacer. Both the dyads have been completely characterized by elemental analysis, MALDI-MS, UV-Vis., and fluorescence (steady state and time-resolved) spectroscopies as well as cyclic voltammetry. The absorption maxima of both dyads are red-shifted by 8-12 nm. The ground state properties showed that there exist minimum π-π interaction between the aromatic subunits of these D-A systems. Quenched emission was observed in both the dyads when excited at 290 nm. The quenched emission explained in terms of intramolecular excitation energy transfer competes with the photo-induced electron transfer reaction in these D-A system. Graphical Abstract Donor-acceptor systems in which a donor pyrene unit is connected at pyrrole-β position using a vinylene spacer of either free-base or Zn(II) porphyrin have been synthesized and characterized. The ground state properties showed that there exists minimum π-π interactions between pyrene and porphyrin macrocycle. Quenched emission was observed in both the dyads when excited at 290 nm. The quenched emission explained in terms of intramolecular excitation energy transfer competes with the photo-induced electron transfer reaction in these D-A system. Indian Academy of Sciences, 2013 Porphyrin nationallicence pyrene nationallicence hydrocarbon nationallicence π - π interactions nationallicence energy nationallicence REETA P. Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500 607, Tarnaka, India aut KANAPARTHI RAVI Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500 607, Tarnaka, India aut GIRIBABU L. Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500 607, Tarnaka, India aut Journal of Chemical Sciences Springer-Verlag 125/2(2013-03-01), 259-266 0974-3626 125:2<259 2013 125 12039 https://doi.org/10.1007/s12039-013-0390-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12039-013-0390-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- REETA P. Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500 607, Tarnaka, India aut NATIONALLICENCE 700 1- KANAPARTHI RAVI Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500 607, Tarnaka, India aut NATIONALLICENCE 700 1- GIRIBABU L. Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500 607, Tarnaka, India aut NATIONALLICENCE 773 0- Journal of Chemical Sciences Springer-Verlag 125/2(2013-03-01), 259-266 0974-3626 125:2<259 2013 125 12039 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer