title: Spectroscopic and structural insights on molecular assembly consisting high potential zinc phthalocyanine photosensitizer attached to PyC60 through non-covalent interaction.
abstract: Efforts to improve the ease of self-assembly formation through non-covalent interaction has led to the development of zinc phthalocyanine (zinc-2,9,16,23-tetra-tert-butyl phthalocyanine, i.e., ZnPc) as a high potential photosensitizer molecule towards C60 pyrrolidine tris-acid ethyl ester (PyC60) in toluene and 1,2-dichlorobenzene (DCB). Steady state fluorescence experiment elicits efficient quenching of the fluorescence intensity of both H2- and ZnPc in presence of PyC60. The average value of binding constant for PyC60/H2-Pc and PyC60/ZnPc systems in toluene (DCB) are determined to be 9910 (13,460) and 12,710 (24,060) dm(3) mol(-1), respectively. Lifetime experiment yields ∼3 times larger magnitude of charge separated rate constant for the PyC60/ZnPc system compared to PyC60/H2-Pc in toluene. Photoinduced energy transfer between PyC60 and H2- (/ZnPc) has been evidenced with nanosecond laser photolysis method; transient absorption studies establish that energy transfer from (T)PyC60(∗) to H2- and ZnPc occurs predominantly, as confirmed by the consecutive appearance of the triplet states of PyC60.
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: School of Chemistry, University of Hyderabad, Hyderabad, AP 500 046, India.
authors.forename: Kotni
authors.initials: K
authors.lastname: Santhosh
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
mesh_terms: D065966:Absorption, Physicochemical; D037741:Fullerenes / Q000737:chemistry*; D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D007700:Kinetics; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry*; D017319:Photosensitizing Agents / Q000737:chemistry*; D066244:Proton Magnetic Resonance Spectroscopy; D011522:Protons; D011789:Quantum Theory; D012997:Solvents; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D055672:Static Electricity; D013997:Time Factors; D017967:Zinc Compounds
chemical_list: D037741:Fullerenes; D007211:Indoles; D054833:Isoindoles; D009942:Organometallic Compounds; D017319:Photosensitizing Agents; D011522:Protons; D012997:Solvents; D017967:Zinc Compounds; C052159:Zn(II)-phthalocyanine
keywords: Binding constant; DFT calculations; Energy transfer; H(2)- and ZnPc; PyC(60)