Jump to main content
Jump to site search

Issue 16, 2018
Previous Article Next Article

Photoluminescence properties of tetrahedral zinc(II) complexes supported by calix[4]arene-based salicylaldiminato ligands

Author affiliations

Abstract

The synthesis and photophysical properties of four new hybrid salicylaldiminato-calix[4]arene ligands and their corresponding zinc(II) complexes are described. The Schiff bases were obtained from condensation reactions between cone-25,27-di(aminoethoxy)-26,28-dihydroxy-calix[4]arene and salicylaldehyde (H2L1) or o-vanillin (H2L2) and 1,3-alt-25,27-di(aminoethoxy)-26,28-di(n-propyloxy)-calix[4]arene and 3,5-di-tert-butyl-salicylaldehyde (H2L3) or o-vanillin (H2L4). Complexation reactions were investigated by ESI-MS, IR, NMR, UV-vis absorption and steady-state and time resolved fluorescence spectroscopy, and X-ray crystallography. All ligands support 1 : 1 complexes (ZnL1–ZnL4), with equilibrium constants derived from absorption spectrophotometry in the range log K11 = 5.5–8.2 (MeCN or MeOH/CH2Cl2, I = 0.01 M). The zinc complexes show blue fluorescence, both in solution as well as in the solid state, with λem, Φf, and τ ranging from 472–504 nm, 0.11–0.60, and 2–9 ns, respectively. The nature of the substituents on the salicylaldiminato fragments was found to be the main parameter that influences the photophysical properties of the zinc complexes. Insights into the electronic nature of the UV-vis transitions were obtained with time dependent density functional theory (TD-DFT) calculations.

Graphical abstract: Photoluminescence properties of tetrahedral zinc(ii) complexes supported by calix[4]arene-based salicylaldiminato ligands

Back to tab navigation

Supplementary files

Publication details

The article was received on 26 Feb 2018, accepted on 03 Apr 2018 and first published on 04 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00757H
Citation: Dalton Trans., 2018,47, 5801-5811
  •   Request permissions

    Photoluminescence properties of tetrahedral zinc(II) complexes supported by calix[4]arene-based salicylaldiminato ligands

    S. Ullmann, R. Schnorr, C. Laube, B. Abel and B. Kersting, Dalton Trans., 2018, 47, 5801
    DOI: 10.1039/C8DT00757H

Search articles by author

Spotlight

Advertisements