title: Chemical physics behind formation of efficient charge-separated state for complexation between PC70BM and designed diporphyrin in solution.
abstract: The present work reports supramolecular interaction of [6,6]-phenyl C71 butyric acid methyl ester (PC70BM) with two designed diporphyrin molecules having dithiophene (1) and carbazole (2) spacer in solvent having varying polarity. Studies on complex formation reveal relatively higher binding constant for PC70BM/2 complex in all the solvent studied. Solvent dependence of charge separation and charge recombination processes in PC70BM/diporphyrin non-covalent complexes has been well established in present work. Donor-acceptor geometry and stabilization of the singlet excited state of the diporphyrin during charge recombination are considered to be the possible reasons for this behavior.
authors.affiliation: Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713 104, India.
authors.forename: Anamika
authors.initials: A
authors.lastname: Ray
authors.affiliation: Department of Chemistry, Raja Rammohan Roy Mahavidyalaya, Radhanagore, Hooghly 712 406, India.
authors.forename: Shrabanti
authors.initials: S
authors.lastname: Banerjee
authors.affiliation: School of Chemistry, University of Hyderabad, AP 500 046, India.
authors.forename: Shalini
authors.initials: S
authors.lastname: Ghosh
authors.affiliation: Bio-organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
authors.forename: Ajoy K
authors.initials: AK
authors.lastname: Bauri
authors.affiliation: Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713 104, India. Electronic address: sum_9974@rediffmail.com.
authors.forename: Sumanta
authors.initials: S
authors.lastname: Bhattacharya
keywords: Diporphyrin; Electron transfer; Fluorescence studies; PC(70)BM; Self-assembly