Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance upgrade on Thursday 4th of May 2017 from 8.00am to 9.00am (BST).

During this time our websites will be offline temporarily. If you have any questions please use the feedback button on this page. We apologise for any inconvenience this might cause and thank you for your patience.



A light harvesting perylene derivative – zinc phthalocyanine complex in water: spectroscopic and thermodynamic studies

Author affiliations

Abstract

A perylene derivative, namely N,N′-bis(2(trimethylammonium iodide)ethylene)perylene-3,4,9,10-tetracarboxyldiimide (TAIPDI) forms nanoscale columnar stacks in water that have been characterized by using optical absorption and emission measurements, dynamic light scattering (DLS), and transmission electron microscopy (TEM). This behaviour was compared with that of unstacked TAIPDI in methanol. Assembly formation between the one-dimensional TAIPDI stacks and zinc phthalocyanine tetrasulphonic groups (ZnPcS4) via strong π–π and ionic interactions has been described in an aqueous medium. The formation constant of the supramolecular dyad has been determined as 2.94 × 104 M−1 from both the absorption and fluorescence measurements. Upon addition of ZnPcS4, the fluorescence quenching of the singlet-excited state of TAIPDI was observed because of the electron transfer process from ZnPcS4 to TAIPDI via the singlet-excited states of ZnPcS4 and TAIPDI entities. The electrochemical studies supported the electron transfer pathways via the singlet states of ZnPcS4 and TAIPDI. The thermodynamic parameters of the supramolecular complex have been determined from stopped-flow measurements. The interaction between ZnPcS4 and TAIPDI occurs in two steps, where the rate constant of the second step with TAIPDI (207 ± 8 M−1 s−1) is much slower than the first one (3515 ± 101 M−1 s−1). Activation parameters for the complex formation (ΔH# = 76 ± 11 kJ mol−1 and ΔS# = 83 ± 37 J K−1 mol−1, and ΔH# = 221 ± 15 kJ mol−1 and ΔS# = 540 ± 50 J K−1 mol−1) were determined from variable temperature studies for the first and second steps, respectively. The significantly positive ΔS# values found for both steps of the interaction reactions are consistent with a dissociative mechanism.

Graphical abstract: A light harvesting perylene derivative – zinc phthalocyanine complex in water: spectroscopic and thermodynamic studies

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 11 Feb 2017, accepted on 21 Mar 2017 and first published on 22 Mar 2017


Article type: Paper
DOI: 10.1039/C7PP00055C
Citation: Photochem. Photobiol. Sci., 2017, Advance Article
  •   Request permissions

    A light harvesting perylene derivative – zinc phthalocyanine complex in water: spectroscopic and thermodynamic studies

    A. El-Refaey, S. Y. Shaban, M. El-Kemary and M. E. El-Khouly, Photochem. Photobiol. Sci., 2017, Advance Article , DOI: 10.1039/C7PP00055C

Search articles by author