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Stimuli-Responsive Luminescent Bis-Tridentate Ru(II) Complexes toward the Design of Functional Materials
journal contribution
posted on 2018-09-20, 21:46 authored by Manoranjan Bar, Sourav Deb, Animesh Paul, Sujoy BaitalikWe report here the
synthesis, characterization, and photophysics of two bis-tridentate
Ru(II) complexes based on a heteroditopic ligand and thoroughly studied
their stimuli-responsive behaviors toward the design of functional
materials. Both complexes display emission at room temperature having
lifetimes in the range of 0.5–70.0 ns, depending on coligand
and solvent. Substantial modulations of absorption and emission spectral
behaviors of the complexes were done upon interaction with anions,
and anion-induced changes in the properties lead to recognition of
selected anions in both organic and aqueous media. Photophysical properties
of the complexes were also tuned by changing the pH of the medium,
and pKa values in both ground and excited
states were determined. The presence of free pyridine-imidazole motifs
in the complexes leads to substantial modulation of the optical properties
and switching of the emission properties upon interaction with selected
cations as well as with protons. Fe2+, Co2+,
Ni2+, and Cu2+ trigger emission quenching, while
Zn2+ induces finite enhancement of the emission intensity
in the complexes. In essence, modulation of the optical properties
and switching of luminescence properties of the complexes were accomplished
by a variety of the external stimuli such as anions, cations, protons,
and pH, as well as solvent polarity. Importantly, the optical outputs
in response to an appropriate set of stimuli were utilized to mimic
the functions of two-input IMPLICATION, NOR, and XNOR logic gates.
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XNOR logic gatesp Ktwo-input IMPLICATIONemission intensitystimuli-responsive behaviorspyridine-imidazole motifsemission quenchingSubstantial modulationsheteroditopic ligandFunctional Materialsanion-induced changesluminescence propertiesPhotophysical propertiescomplexes display emissionemission propertiesroom temperature
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