Cd(II) Based Coordination Polymer Series: Fascinating Structures, Efficient Semiconductors, and Promising Nitro Aromatic Sensing

Abstract

Three Cd­(II) based coordination polymers (CPs) (1–3) are designed using 3-aminoquinoline and 5-aminoquinoline based Schiff base ligands and thiocyanate and dicyanamide as bridging ligands. Pseudohalide linkers play a crucial role in the architecture of the CPs. These compounds are prepared under an ambient condition with high yield. The I–V characteristics of the 1–3 based thin film devices (Al/complex interface) under dark and illumination conditions are nonlinear rectifying nature, which is the signature of a Schottky barrier diode (SBD). The rectification ratio (I on/I off) of the SBDs under dark condition at ±2 V has been obtained as 16.41, 15.48, and 14.73 and under illumination conditions; the same has been evaluated as 67.18, 46.23, and 37.69 for 1, 2, and 3, respectively. The photoresponsivity of the device is found to be 5.52, 2.89, and 2.54 for 1, 2, and 3 based SBDs, respectively. The enhancement of conductivity under photoilluminated conditions depends on π-electron donor capacity of Schiff base ligands and the length of pseudohalide linkers of 1–3. Again, depending on the binding fashion of the coordinating ligands, three CPs (1–3) exhibit different selectivity toward nitroaromatic sensing. In 2,4,6-trinitrophenol (TNP) sensing, CPs follow the order 3 > 2 > 1. CP 3 has the highest quenching constant among the other two CPs along with a prominent selectivity and lowest detection limit in response to TNP.

N-alkylation briefly constructs tunable multifunctional sensor materials: Multianalyte detection and reversible adsorption

“…In the low concentration range, the S-V plot is linear, and the K sv values for SPBI-c toward PA, DNP, and NP were 6.5631 3 10 4 , 4.5122 3 10 4 , and 3.8651 3 10 4 M À1 , respectively. These K sv values are higher than those of the most reported fluorescent polymer sensors for NACs detection (Ghorai et al, 2019;Dutta et al, 2020).…”

“…Using a reported method (Jiao et al, 2019;Zhang et al, 2019a), the fluorescence quenching efficiencies of three typical NACs (PA, DNP, and NP) for SPBI-c were studied (Figure 6 and S43). With 160 mM PA, a maximum quenching efficiency of 96.8% was obtained, whereas higher concentrations of DNP and NP were required to achieve similar quenching efficiencies, demonstrating the high sensitivity of SPBI-c to PA. Further-more, using a reported approach (Gao et al, 2019;Nandi et al, 2020), the LODs of SPBI-c for PA, DNP, and NP were calculated to be 1.81 3 10 À7 , 2.29 3 10 À7 and 2.62 3 10 À7 M, respectively, which are equivalent to the LODs of some reported NAC sensors (Gao et al, 2019;Nandi et al, 2020;Ghorai et al, 2019;Dutta et al, 2020).…”

Discerning Detection of Mutagenic Biopollutant TNP from Water and Soil Samples with Transition Metal-Containing Luminescence Metal–Organic Frameworks

“…According to the Bailer twist, the side of the triangle (s), the inter-triangular distance (h), and the twist angle (ϕ), have a specific order, like regular octahedron having s/h = 1.22, ϕ = 60°(Figure S1). 40,41 Herein, Mn@MOF, for Mn1, the s/h value and the average twist angle are 1.24 and 89.25°, respectively, representing a regular octahedron geometry, whereas for Mn2, these values are s/h = 1.13 and ϕ = 83.87°, respectively, which is signifying a highly distorted trigonal (Figure S2) octahedron geometry (Figure 3a). Interestingly, for Cd@MOF, Cd1 has also espoused an octahedral (O h ) geometry.…”

A Multifunctional 3D Supermolecular Co Coordination Polymer With Potential for CO2 Adsorption, Antibacterial Activity, and Selective Sensing of Fe3+/Cr3+ Ions and TNP

“…The S-V plot shows that the concentration of TNP and I 0 /I possess a direct relationship over the added TNP volume range (100-1000 μL), with a linear fit coefficient value of 0.982. It is commendable that the K sv value of sensing TNP reaches 3.99 × 10 5 M −1 (Supplementary Figure S6), which is one of the highest reported values for TNP sensing, and the limit detection of TNP is 0.0376 mM (Hong et al, 2017;Hua et al, 2018;Gogia and Mandal, 2019;Ghorai et al, 2019;Wang et al, 2019).…”