Designing of Interdigitated Coordination Polymer for Fluorogenic Sensing of Pd(II) in Water with Reversible Nonphase Mechanochromism

Abstract

In the present study, a novel interdigitated coordination polymer (CP) [Zn(cit)(4‐nvp)]n (1) is synthesized using citraconic acid (H2cit) and 4‐(1‐naphthylvinyl)pyridine (4‐nvp) mixed ligands. The efficient dipolar interactions between CP and polar solvents cause the observed redshift in emission spectra and rationalize the positive solvatochromism effect with increased Stokes shift (Δδ) from 5643 to 8547 cm−1 on going from less‐polar to more‐polar solvents. Supramolecular assembly of CP acts as a selective optical sensor toward Pd(II) even in the presence of other relevant contending metal ions in water. Inspired from the solution‐phase sensor activity, the CP is further employed for an on‐site and ecologically green contact mode detection of Pd(II) from water upon readily fabricating cost‐effective and portable thin film via simply drop‐casting aqueous suspension of material (1 mm) on filter paper. Interestingly, the compound exhibits the rare mechanochromic behavior upon external pressure. Hence, the synthesized CP reveals sensing activity in diverse way; in one hand, it demonstrates solvatochromism and, in other hand, it unveils mechanochromism accompanied by the detection of Pd(II) in aqueous medium.

A Gelation-Induced Enhanced Emission Active Stimuli Responsive and Superhydrophobic Organogelator: “Turn-On” Fluorogenic Detection of Cyanide and Dual-Channel Sensing of Nitroexplosives on Multiple Platforms

“…The outcome indicates the ICT feature for F1, where the higher dipole moment of fluorophores at excited state due to pulling of electron density from pyrene by fluorophenyl and cyanovinyl units caused better interaction with the dipoles of polar solvent molecules and led to positive solvatochromism due to stabilization of the charge transfer state. 39,53,54 Moreover, the charge distribution on different molecular segments of energy optimized F1 simulated from the b3lyp/6-311g theory indicated that HOMO was mostly composed of a pyrene character (88%) with minimum contributions from fluorophenyl (8%) and cyanovinyl (4%) units (Table S7). Accordingly, the percentage of acceptor characters was significantly enhanced at LUMO, where 37 and 12% contributions were noticed from fluorophenyl and cyanovinyl cores, respectively, on going from HOMO to LUMO, which supported the ICT characteristics.…”

Phenylalanine-Based Co2+ and Cd2+ 1D Coordination Polymers: Structural Properties and Catalytic Application for Solvent-Free Aerobic Oxidation of Cycloalkene

“…For instance, compared to 3D and 2D coordination networks, 1D polymeric architectures tend to exhibit greater flexibility and dynamic deformation. Thus, they may exhibit augmented stimuli-induced structural deformations, showing a great potential for the design of stimuli-responsive smart polymeric materials. , Moreover, due to the development of noncovalent interactions between 1D infinite chains, they are able to lead to the formation of interesting supramolecular architectures with a wide variety of topologies and properties − and also they can act as suitable templates for the obtaining of postsynthetic higher dimension CPs . Based on the most common structural features, 1D CPs can be classified as linear, ladder, zigzag, ribbon, and helical.…”