A comparative study of proton conduction between two new Cd(II) and Co(II) complexes and in vitro antibacterial study of the Cd(II) complex

Abstract

Two new complexes based on 4,4′‐[1,3‐phenylenebis(oxy)]diphthalic acid (H4L) ligands were synthesized, namely, [Cd2(L)(1,10‐phen)2(H2O)]n(1) and [Co2(L)(1,10‐phen)2(H2O)]n(2), in which 2D structures transform into 3D supramolecular structures by CH···π interaction. The proton conductivity of complexes 1 and 2 at low temperature is close (σ1 = 3.12 × 10−8 S cm−1 and σ2 = 3.81 × 10−8 S cm−1 at 30°C), but these two complexes show different conduction mechanisms. The Vehicular mechanism in 1 is caused by the O···H/H···O contact in 1, which is stronger than 2, and the Grotthuss mechanism in 2 is caused by the N···H/H···N contact in 2, which is stronger than 1. At the same time, complex 1 showed excellent antibacterial properties in vitro, mainly reflected in that five kinds of bacteria (Escherichia coli, Bacillus amyloliquefaciens, Pantoea agglomerans, Pseudomonas putida, and Pectobacterium carotovora) could play an obvious inhibitory effect in the concentration range of 20 μg·ml−1.

In Situ Synthesis of 3D BiOCl–Graphene Aerogel and Synergistic Effect by Photo-Assisted Activation of Persulfate for Methyl Orange Degradation

“…The arc radius of the Nyquist circle reflected the charge transfer resistance. Smaller charge transfer resistance might be conducive to the separation and transfer efficiency of the optical carrier [ 32 , 33 ]. The ohmic resistance (R S ) and the charge transfer resistance (R CT ) of BGA-4 were 39.73 Ω and 54.15 Ω, substantially lower than those of GA (42.26 Ω and 111.74 Ω), which indicated that BiOCl could improve the conductivity and electron transfer capacity of BGA-4 composite.…”

Photochromic Ln-Phosphonates Assembled by an Imidazole Derivative: Construction, Crystal Structures, and Light-Enhanced Proton Conductivity

“…Coordination polymers (CPs) assembled with metal ions/clusters and organic ligands are a class of crystalline complexes and have attracted great attention in sensing detection, separation, and adsorption due to their designable and tunable structures and functional porosity. − Recently, CPs have become a new candidate material for proton conduction as the hydrogen-bond networks could be formed through introducing typical ligands with hydrophilic units or proton carriers. − In this way, high-conductivity CPs are constructed with good proton transport paths. Most importantly, the visualization of the structure of CPs provides an opportunity to explore the proton conduction mechanism and pathway, which makes it possible to analyze the structure–property relationship in depth.…”

Ligand Modulation on the Various Structures of Three Zinc(II)-Based Coordination Polymers for Antibiotics Degradation

“…These materials have demonstrated excellent potential employment in multiple aspects, for example, sensing [ 18 , 19 , 20 , 21 , 22 ], photocatalysis [ 23 , 24 , 25 ], heterogeneous catalysis [ 26 , 27 , 28 , 29 ], gas storage [ 30 , 31 , 32 , 33 ], and drug delivery [ 34 , 35 , 36 ]. They are well known for their extensive structural tunability, high porosity, unique physicochemical properties, and light reactivity.…”