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1. Oxoiron(IV) Tetramethylcyclam Complexes with Axial Carboxylate Ligands: Effect of Tethering the Carboxylate on Reactivity

   https://doi.org/10.1021/acs.inorgchem.6b02659  

   Bigelow, Jennifer O.; England, Jason; Klein, Johannes E.; Farquhar, Erik R.; Frisch, Jonathan R.; Martinho, Marlène; Mandal, Debasish; Münck, Eckard; Shaik, Sason; Que, Lawrence (March 2017, Inorganic Chemistry)
2. Disposable paper strips for carboxylate discrimination

   https://doi.org/10.1039/d0an00137f  

   Xu, Yifei; Bonizzoni, Marco (January 2020, The Analyst)

   We describe a method for the differentiation of carboxylate anions on disposable paper supports (common printer paper, filter paper, chromatography paper), based on differential patterns of interactions between carboxylates and a fluorescent sensing system. The sensor was built from commercially available components, namely a polycationic fifth generation amine-terminated poly(amidoamine) dendrimer (PAMAM G5) and a small organic fluorophore (calcein) through non-covalent interactions. The assay's physical dimensions were chosen to conform to the microwell plate standard so detection could be carried out on widely available plate reader instrumentation. The sensing complex was first deposited in spots on a paper support to prepare the sensor strip; a carboxylate solution was then loaded on each spot. Nuanced changes in fluorescence were associated with carboxylate binding to the PAMAM dendrimer, characteristic of the structure and affinity of each carboxylate. Such signal changes, interpreted through Linear Discriminant Analysis (LDA), contained enough information to recognize and successfully discriminate most anions in the panel. Among the substrates we tested, chromatography paper was the most promising. The relationship between the structure of the carboxylates and the patterns giving rise to their differentiation was also discussed. Finally, the long-term stability (“shelf life”) of the pre-assembled [calcein·dendrimer] sensing system was found to be excellent when deposited on paper support. 

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3. Clickable Norbornene-Based Zirconium Carboxylate Polyhedra

   https://doi.org/10.1021/acs.chemmater.2c03252  

   Pastore, Vincent J.; Sullivan, Meghan G.; Welgama, Heshali K.; Crawley, Matthew R.; Friedman, Alan E.; Rumsey, Clayton; Trebbin, Martin; Rzayev, Javid; Cook, Timothy R. (February 2023, Chemistry of Materials)
4. Pyrazine-2-carboxylate copper(II) complexes

   https://doi.org/10.1080/00958972.2022.2142576  

   Araujo Martinez, Alma; Landee, Christopher P.; Dickie, Diane A.; Turnbull, Mark M. (December 2022, Journal of Coordination Chemistry)
5. Carboxylate ester-based electrolytes for Na-ion batteries

   https://doi.org/10.1039/D4SC02266A  

   Qin, Yunan; Choi, Seong-Gyu; Mason, Lucia; Liu, Jing; Li, Zongjian; Gao, Tao (May 2024, Chemical Science)

   Sodium-ion batteries (SIBs) is a promising technology for next-generation energy storage. However, their performance is limited at low temperatures due to the inferior bulk and interfacial resistance of current electrolytes. Here we present a systematic study to evaluate carboxylate ester-based electrolytes for SIB applications, due to their favorable properties (i.e., low melting point, low viscosity and high dielectric constant). The effects of salt, concentration and solvent molecular structure were systematically examined and compared with those of carbonate-based electrolytes. By combining electrochemical tests with spectroscopic characterization, the performance of selective carboxylate ester-based electrolytes in hard carbon/Na and Na3V2(PO4)3/Na half-cells was evaluated. We found carboxylates enable high electrolyte conductivities, especially at low temperatures. However, carboxylates alone are inadequate to form a stable interphase due to their high reactivity, which can be addressed by choosing a suitable anion and facilitating anion-rich Na+ solvation by increasing salt concentration. Fundamental knowledge on the chemistry–property–performance correlation of this new family of electrolytes was obtained, and their benefits and pitfalls were thoroughly discussed. These discoveries and knowledge will shed light on the potential of carboxylate ester-based electrolytes and provide the foundation for further electrolyte engineering. 

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