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Oxidative stress from reactive oxygen species (ROS) is a reperfusion injury factor that can lead to cell damage and death. Here, ultrasmall iron‐gallic acid coordination polymer nanodots (Fe‐GA CPNs) were developed as antioxidative neuroprotectors for ischemia stroke therapy guided by PET/MR imaging. As proven by the electron spin resonance spectrum, the ultrasmall Fe‐GA CPNs with ultrasmall size, scavenged ROS efficiently. In vitro experiments revealed that Fe‐GA CPNs could protect cell viability after being treated with hydrogen peroxide (H2O2) and displayed the effective elimination of ROS by Fe‐GA CPNs, which subsequently restores oxidation balance. When analyzing the middle cerebral artery occlusion model, the neurologic damage displayed by PET/MR imaging revealed a distinct recovery after treatment with Fe‐GA CPNs, which was proved by 2,3,5‐triphenyl tetrazolium chloride staining. Furthermore, immunohistochemistry staining indicated that Fe‐GA CPNs inhibited apoptosis through protein kinase B (Akt) restoration, whereas western blot and immunofluorescence indicated the activation of the nuclear factor erythroid 2‐related factor 2 (Nrf2) and heme oxygenase‐1 (HO‐1) pathway following Fe‐GA CPNs application. Therefore, Fe‐GA CPNs exhibit an impressive antioxidative and neuroprotective role via redox homeostasis recovery by Akt and Nrf2/HO‐1 pathway activation, revealing its potential for clinical ischemia stroke treatment. Oxidative stress from reactive oxygen species (ROS) is a reperfusion injury factor that can lead to cell damage and death. Ultrasmall Fe‐GA CPNs were synthesized to exert a protective role in ischemic brain neurons via removal of ROS, rescuing of glucose metabolism, and suppressing apoptosis through the upregulation of protein kinase B (Akt), antioxidant nuclear factor erythroid 2‐related factor 2/heme oxygenase‐1 (Nrf2/HO‐1) pathway.

The book serves as both an introduction and a practical guide on the synthesis and use of polyphosphazenes, a new and very versatile polymer family which has recently demonstrated bioactivity, biocompatibility, and biodegradability.

Mixed protonic‐electronic conductors (MPECs) have been developed to maximize static conductivity for electrochemical applications, but emerging applications that leverage proton‐electron coupling (PEC) require dynamic conductivity control. To achieve this, we propose a “de‐doping” strategy in a hydrogen‐bonded coordination polymer [Co(DMF)2(H2O)2(bipy)](NO3)2·2(DMF)n (bipy = 4,4’‐bipyridine, DMF = N,N‐dimethylformamide) named Co‐BAND. By isostructural substitution of Ni(II) (d8) in the established Ni‐BAND with Co(II) (d7), we designed Co‐BAND to suppress the intrinsic conductivity while preserving proton transport and PEC. As a result, Co‐BAND exhibits a giant conductivity modulation (1.15 × 106) in response to humidity changes and implements complex brain‐like learning rules. We also demonstrate chemical control of synaptic plasticity via solvent vapor exposure. This biomimetic neuromodulation tunes transport and learning rules based on vapor polarity, proticity, and steric effects. This work establishes conductivity modulation as an important design metric for MPECs and highlights their potential as designable platforms for stimuli‐responsive applications. A “de‐doping” strategy positions mixed protonic–electronic conductors (MPECs) as adaptive neuromorphic platforms with dynamically tunable transport. Co‐BAND achieves giant conductivity modulation (>106) and chemically tunable synaptic plasticity. Analogous to biological neuromodulation, solvent vapors dynamically reprogram the device's learning rules based on molecular polarity and proticity, enabling environment‐adaptiveness.

This research investigates cobalt-based and iron-based coordination polymers as advanced adsorbents for removing nitrate from water, addressing the increasing demand for effective and customizable treatment materials. Both coordination polymers were synthesized through solvothermal methods using terephthalic acid as the organic linker and were characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), which verified their crystalline, porous structures and uniform metal dispersion; Fourier-transform infrared spectroscopy (FTIR) was used to analyze surface characteristic functional groups of the samples before and after adsorption. Batch adsorption tests combined with response surface methodology (RSM), based on a Box–Behnken (BBD), were employed to optimize key operating conditions, including adsorbent dose (0.1–0.5 g/L), pH (3–7), and temperature (25–45 °C). Under optimal conditions (pH 3–5, 0.3 g/L, 30–35 °C), the Co-coordination polymer achieved a maximum nitrate removal of 54.1% and an adsorption capacity of 212.8 mg/g, while the Fe-coordination polymer reached 30.5% removal with a capacity of 35.0 mg/g. Kinetic studies were well fitted by the pseudo-second-order (PSO) model for the Co-coordination polymer (R2 = 0.992–0.997), indicating chemisorption control, whereas the Fe-coordination polymer exhibited diffusion-driven behavior. The equilibrium data fit the Langmuir model well for both, confirming monolayer adsorption. The findings suggest that the Co-coordination polymer provides superior nitrate removal owing to stronger metal–anion interactions, whereas the Fe-coordination polymer offers more stable but lower adsorption capacity.

The design of suitable chemosensors for environmental pollutants and toxins detection at trace levels remains a critical area of research. Among various chemosensors, Zn(II) coordination polymers have garnered special interest as fluorescent probes for environmental applications. In this article, we report the synthesis of a nitrogen-rich luminescent Zn(II) coordination polymer, TDPAT-Zn-CP, designed for differential fluorescent sensing of antibiotics in an aqueous medium. TDPAT-Zn-CP was synthesized using a star-shaped 2,4,6-tris(di-2-pyridylamino)-1,3,5-triazine (TDPAT) fluorophore, a promising blue-emitting compound. The morphological and structural properties of TDPAT-Zn-CP were thoroughly analyzed using conventional spectroscopic and analytical techniques. The fluorescence titration studies in aqueous medium demonstrated that TDPAT-Zn-CP exhibits remarkable selectivity, sensitivity, and differential fluorescence sensing responses towards various antibiotics. Among the antibiotics tested, TDPAT-Zn-CP displayed a significant fluorescence quenching and high selectivity for sulfamethazine (SMZ), with a Stern–Volmer quenching constant of KSV = 1.68 × 104 M−1 and an impressive sensitivity of 4.95 ppb. These results highlight the potential of TDPAT-Zn-CP as a practically useful, highly effective polymeric sensor for the differential fluorescence-based detection of antibiotics in water, offering a promising approach for environmental monitoring and contamination control.

The design and development of useful chemosensors for the ultra-trace detection of environmental pollutants and contaminants is a topical area of research. Herein, we report a new nanoscale emissive Zn(II) coordination polymer (TB-Zn-CP) for differential fluorescence sensing of various antibiotics in water. TB-Zn-CP was synthesized using a unique V-shaped green emitting 4-amino-1,8-naphthalimide Tröger’s base (TBNap) fluorophore. The structural and morphological features of TB-Zn-CP were characterized by various standard spectroscopic and microscopy techniques. The fluorescence titration studies in water demonstrated a remarkable sensitivity and differential fluorescence sensing properties of TB-Zn-CP for the fast detection of different antibiotics. Among different antibiotics, chloramphenicol (CRP), 1,2-dimethyl-5-nitroimidazole (DMZ), and sulfamethazine (SMZ) displayed the highest fluorescence-quenching efficiency and superior sensitivity in their detection. The differential sensing capability of TB-Zn-CP was also indicated by visualizable color changes. The Stern–Volmer quenching constant KSV was determined to be in the order of 103–104 M−1, and the sensitivity was shown to be at a nanomolar (10−9 M) level. All these results confirm that TB-Zn-CP can be a potential and practically useful polymeric sensor for differential fluorescence and visual detection of different antibiotics in water.

To solve the energy crisis and environmental issues, it is essential to create effective and sustainable energy conversion and storage technologies. Traditional materials for energy conversion and storage however have several drawbacks, such as poor energy density and inadequate efficiency. The advantages of MOF-based materials, such as pristine MOFs, also known as porous coordination polymers, MOF composites, and their derivatives, over traditional materials, have been thoroughly investigated. These advantages stem from their high specific surface area, highly adjustable structure, and multifunctional nature. MOFs are promising porous materials for energy storage and conversion technologies, according to research on their many applications. Moreover, MOFs have served as sacrificial materials for the synthesis of different nanostructures for energy applications and as support substrates for metals, metal oxides, semiconductors, and complexes. One of the most intriguing characteristics of MOFs is their porosity, which permits space on the micro- and meso-scales, revealing and limiting their functions. The main goals of MOF research are to create high-porosity MOFs and develop more efficient activation techniques to preserve and access their pore space. This paper examines the porosity tunable mixed and hybrid MOF, pore architecture, physical and chemical properties of tunable MOF, pore conditions, market size of MOF, and the latest development of MOFs as precursors for the synthesis of different nanostructures and their potential uses.

A one-dimensional (1D) coordination polymer [Cu[sub.2] (bpba)(CH[sub.3] COO)[sub.4] ] (1) and a two-dimensional (2D) coordination polymer [Cu(bpba)[sub.2] (H[sub.2] O)(NO[sub.3] )](NO[sub.3] )∙2H[sub.2] O∙MeOH (2) were synthesized by the reaction between Cu(CH[sub.3] COO)[sub.2] ∙H[sub.2] O/Cu(NO[sub.3] )[sub.2] ∙3H[sub.2] O and bis(4-pyridyl)benzylamine (bpba). The Cu(II) ions of 1 and 2 have distorted-square pyramidal coordination with a paddle-wheel structure and an octahedral geometry, respectively. By coordinating the Cu(II) ions and bpba ligands, 1 and 2 formed zigzag 1D and puckered 2D coordination polymers, respectively. Polymer 1 exhibits strong emissions at 355 and 466 nm, whereas polymer 2 exhibits strong emissions only at 464 nm. The emissions are strongly dependent on the geometry of the Cu(II) ions linked by the bpba and anionic ligands. Polymer 1 exhibits a very strong antiferromagnetic interaction within the paddle-wheel dimer, whereas polymer 2 exhibits a very weak antiferromagnetic interaction through the bpba linkers and/or space.

Three new cadmium coordination polymers, namely [Cd(NO3)2(DPNDI)(CH3OH)]·CH3OH (1), [Cd(SCN)2(DPNDI)] (2), and [Cd(DPNDI)2(DMF)2]·2ClO4 (3) (DPNDI = N,N-di(4-pyridyl)-1,4,5,8-naphthalene diimide, DMF = N,N-dimethylformamide) have been synthesized by reactions of DPNDI with Cd(NO3)2, Cd(SCN)2, and Cd(ClO4)2, respectively. Compound 1 is a one-dimensional coordination polymer with strong lone pair-π interactions between the coordinated NO3− anions and the imide ring of DPNDI; while 2 is a two-dimensional network with a (4, 4) net topology. In the case of 3, due to the presence of uncoordinated perchlorate counter ions, it exhibits a non-interpenetrated square-grid coordination polymer containing one-dimensional rhomboid channels. The structural diversity in these compounds is attributed to different coordination abilities and geometries of counter anions. Due to the presence of electron-deficient NDI moiety, the photochromic behavior of these compounds was studied. Interestingly, only compounds 1 and 3 exhibit color changes under light irradiation. The influence of the anions on the photochromism process of the NDI-based materials has been discussed.

Today’s world requires high-performance energy storage devices such as hybrid supercapacitors (HSc), which play an important role in the modern electronic market because supercapacitors (Sc) show better electrical properties for electronics devices. In the last few years, the scientific community has focused on the coupling of Sc and battery-type materials to improve energy and power density. Recently, various hybrid electrode materials have been reported in the literature; out of these, coordination polymers such as metal-organic frameworks (MOFs) are highly porous, stable, and widely explored for various applications. The poor conductivity of classical MOFs restricts their applications. The composite of MOFs with highly porous graphene (G), graphene oxide (GO), or reduced graphene oxide (rGO) nanomaterials is a promising strategy in the field of electrochemical applications. In this review, we have discussed the strategy, device structure, and function of the MOFs/G, MOFs/GO, and MOFs/rGO nanocomposites on Sc. The structural, morphological, and electrochemical performance of coordination polymers composites towards Sc application has been discussed. The reported results indicate the considerable improvement in the structural, surface morphological, and electrochemical performance of the Sc due to their positive synergistic effect. Finally, we focused on the recent development in preparation methods optimization, and the opportunities for MOFs/G based nanomaterials as electrode materials for energy storage applications have been discussed in detail.