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Elsevier, Inorganic Chemistry Communications, (36), p. 22-26

DOI: 10.1016/j.inoche.2013.07.019

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The first substituted macrocyclic ligand Py2N4S2 containing four naphthylmethylene pendant-armed groups: synthesis and photophysical properties

Journal article published in 2013 by Sergio Seixas de Melo, Verónica García, J. Sérgio Seixas de Melo ORCID, Anxela Aldrey, Catherine S. De Castro ORCID, Rufina Bastida, Alejandro Macías, Carlos Lodeiro ORCID, catherdine D. Castro, J. Sérgio Seixas de Melo, Cristina Núñez
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This paper is available in a repository.

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Abstract

The synthesis of a pendant donor emissive macrocyclic ligand Py2N4S2 with up to four naphthylmethylene arms (L) has been achieved. Their derivative solid metal complexes (Co2 +, Ni2 +, Cu2 +, Zn2 +, Cd2 +, Hg2 + and Ag+) have been isolated and characterized. The photophysical properties of the free ligand L and their complexation behaviour have been investigated in solution. In dichloromethane, the free ligand presents two emission bands which are related to the monomer naphthalene emission and a red-shifted band attributable to ground state dimers (interaction between two naphthalene chromophores), which was further validated from time-resolved data, with bi-exponential decay with absence of dynamic components. UV–Vis spectroscopy has revealed a 2:1 binding stoichiometry for Co2 +, Cu2 +, Zn2 +, Hg2 + and Ag+.