A half-conjugate polydentate Salamo–Salen
hybrid ligand, H
5
L, containing two unique
N2O2 pockets was first designed so that these
metal ions in the complexes appear in different coordination modes.
Two heterohexanuclear 3d–s double-helical cluster complexes,
[Zn4Ca2
L
2(μ1-OAc)2(EtOH)2]·2EtOH (1; EtOH = ethanol) and [Zn4Sr2
L
2(μ2-OAc)2(MeOH)2]·2CH2Cl2 (2; MeOH = methanol),
are reported that are formed through the reaction of H
5
L with zinc(II) and calcium(II)
acetate or strontium(II) acetate, respectively. IR spectral analysis
of the two complexes showed the existence of monodentate- and bidentate-coordinated
acetate ions. The fluorescence properties of the ligand and its two
heterohexanuclear complexes were explored in MeOH and water solutions,
separately. In addition, theoretical calculations (density functional
theory, interaction region indicator, and bond order) were performed
to further understand the formation of a single-molecular double helix
and the electron distribution characteristics of the two complexes.
Due to its high reactivity and oxidative strength, singlet oxygen (1O2) is used in a variety of fields including organic synthesis, biomedicine, photodynamic therapy and materials science. Despite its importance, the controlled trapping and release of 1O2 is extremely challenging. Herein, we describe a one‐dimensional coordination polymer, CP1, which upon irradiation with visible light, transforms 3O2 (triplet oxygen) to 1O2. CP1 consists of CdII centers bridged by 9,10‐bis((E)‐2‐(pyridin‐4‐yl)vinyl)anthracene ligands which undergo a [4+2] cycloaddition reaction with 1O2, resulting in the generation of CP1−1O2. Using microwave irradiation, CP1−1O2 displays efficient release of 1O2, over a period of 30 s. In addition, CP1 exhibits enhanced fluorescence and has an oxygen detection limit of 97.4 ppm. Theoretical calculations reveal that the fluorescence behaviour is dominated by unique through‐space conjugation. In addition to describing a highly efficient approach for the trapping and controlled release of 1O2, using coordination polymers, this work also provides encouragement for the development of efficient fluorescent oxygen sensors.
A novel turn-on fluorogenic aldehyde-appended salamo-like copper(II) complex probe (ASC), was rationally designed and exploited for the two-pronged sensing of thiosulfate (S2O32-) ion and glutathione (GSH) based on intramolecular charge...
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