Influence of a series of pyridine ligands on the structure and photophysical properties of Cd(ii) complexes

Daniel Ejarque, Teresa Calvet, Mercè Font-Bardia, Josefina Pons*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

4 Citations (Scopus)

Abstract

Among the group 12 metal ions, the Cd(ii) ion presents an ionic radius comparable to that of Hg(ii), while its electronegativity resembles that of Zn(ii). Thus, these characteristics make it a suitable candidate for the synthesis of fluorescent coordination complexes given that it tends to maximize the chelation enhanced effect (CHEF), while its electronegativity helps to prevent the quenching of fluorescence generated by the heavy atom effect. Accordingly, herein, we performed a systematic study using Cd(ii) compounds bearing α-acetamidocinnamic acid (HACA) and different N-, N^N- and N^N^N-pyridine ligands (dPy), namely pyridine (py) (1), 3-phenylpyridine (3-phpy) (2), 2,2′-bipyridine (2,2′-bipy) (3), 1,10-phenantroline (1,10-phen) (4) and 2,2′:6′,2′′-terpyridine (terpy) (5). The elucidation of their crystal structures revealed the formation of one coordination polymer (1), one dimer (3) and three monomers (2, 4, and 5). All the synthesized compounds were characterized via analytical and spectroscopic techniques, and their molecular and supramolecular structures were discussed. The photophysical properties of 1-5 in MeOH were studied and their quantum yields (Φ) were calculated, revealing an enhancement in the Φ value of the complexes generated by the CHEF of dPy.

Original languageEnglish
Pages (from-to)2808-2824
Number of pages17
JournalCrystEngComm
Volume24
Issue number15
DOIs
Publication statusPublished - 16 Mar 2022

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