Dicarboxylate Ligands Modulated Structural Diversity in the Construction of Cd(II) Coordination Polymers Built from N-Heterocyclic Ligand: Synthesis, Structures, and Luminescent Sensing

Abstract

Structural analyses indicate that CP 1 manifests a three-dimensional (3D) 6 6 -dia framework. CP 2 displays a 3D 4 12 •6 3 network based on dinuclear units Cd 2 (COO) 2 . CP 3 shows a one-dimensional (1D) zigzag chain structure. CP 4 presents a 6 5 •8 framework with paddle-wheel-like Cd 2 (COO) 4 secondary building units. CPs 5 and 6 show a 1D double-chain structure and a 1D linear chain structure, respectively. The structural discrepancy of CPs 1−6 demonstrates that dicarboxylate ligands have a major impact on the structures of CPs. Furthermore, CP 4 shows remarkable sensing performance for Fe 3+ ions and pesticides with luminescent quenching, which can function as a luminescent sensor for Fe 3+ ions and pesticides.

Metal–Organic Framework-Based Selective Molecular Recognition of Organic Amines and Fixation of CO2 into Cyclic Carbonates

“…The excited-state fluorescence intensity decay data were assimilated in the time domain using a Horiba Jobin Yvon Fluorocube time-correlated single-photon counting (TCSPC) fluorimeter. The (%) fluorescence quenching efficiency was calculated using the literature formula ( I 0 – I )/ I 0 × 100%, where I 0 and I are the maximum fluorescence intensities of concerned MOF in the absence and presence of the analyte, respectively. − …”

Correlation in Structural Architecture toward Fabrication of Schottky Device with a Series of Pyrazine Appended Coordination Polymers

“…The coordination polymers (CPs) − are attractive much for their multifunctional property and have potential for sustainable applications. These materials have been exploited in the field of gas storage and mixture separation, , electrical conductivity, − sensing, − water splitting, variable temperature magnetism, catalysis, ion exchange, etc. Many of the CP frameworks are showing high conductivity , and have been activated by light irradiation.…”

A luminescent Cd(ii) coordination polymer as a multi-responsive fluorescent sensor for Zn2+, Fe3+ and Cr2O72− in water with fluorescence enhancement or quenching

“…[42][43][44] Moreover, the Lewis basic sites in uorescent CPs can interact with certain metal cations, which can enhance the selective sensing capacity towards metal cations. 45 Based on the above considerations, we adopted a multidentate ligand 5-(2-benzothiazolyl)isophthalic acid (H 2 btic) as a main ligand, which contains two aromatic rings. Such ligand was accompanied by an auxiliary ligand with excellent optical properties 1,10-phenanthroline (phen) to fabricate a luminescent CP, namely {[Cd(btic)(phen)]$ 0.5H 2 O} n (CP-1).…”