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1. Improved synthesis of N -ethyl-3,7-bis(trifluoromethyl)phenothiazine

   https://doi.org/10.1039/D0NJ00184H  

   Ergun, Selin; Casselman, Matthew D.; Kaur, Aman Preet; Attanayake, N. Harsha; Parkin, Sean R.; Odom, Susan A. (July 2020, New Journal of Chemistry)

   N -Ethyl-3,7-bis(trifluoromethyl)phenothiazine is a highly soluble redox shuttle for overcharge protection in lithium-ion batteries with an oxidation potential of ca. 3.8 V vs. Li +/0 in carbonate solvents. This compound has enabled extensive overcharge protection of LiFePO 4 /graphite cells and does so at high charging rates at high concentrations. Our initial synthesis of this compound suffered from low yields and difficult purifications. Here we report a cleaner, higher-yielding synthesis and additional characterization of the product and its stable radical cation salt. 

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2. Decoding the Effect of Anion Identity on the Solubility of N -(2-(2-Methoxyethoxy)ethyl)phenothiazine (MEEPT)

   https://doi.org/10.1021/acs.energyfuels.5c00472  

   Perera, Anton S; Wang, Yilin; Ruhunage, Sashen; Robertson, Lily A; Suduwella, T Malsha; Parkin, Sean R; Ewoldt, Randy H; Risko, Chad; Kaur, Aman Preet (June 2025, Energy & Fuels)
3. Ethyl cellulose- block -poly(benzyl glutamate) block copolymer compatibilizers for ethyl cellulose/poly(ethylene terephthalate) blends

   https://doi.org/10.1039/D4PY00688G  

   Chinn, Abigail F; Trindade_Coutinho, Isabela; Kethireddy, Saipranavi Reddy; Williams, Noah R; Knott, Kenneth M; Moore, Robert B; Matson, John B (August 2024, Polymer Chemistry)

   Luscombe, Christine; Anastasaki, Athina; Du_Prez, Filip; Frey, Holger; Hu, Rongrong; Klausen, Rebekka; Konkolewicz; Li, Zhibo; Li, Zi_Chen; Sardon, Haritz (Ed.)

   A block copolymer with the structure ethylcellulose-block-poly(benzy glutamate) was synthesizedviaring-opening polymerization and used as a compatibilizer to produce blends of ethylcellulose and poly(ethylene terephthalate). 

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4. Synthesis and crystal structure of catena -poly[[tetra-μ-acetato-copper(II)]-μ-6-ethoxy- N ² , N ⁴ -bis[2-(pyridin-2-yl)ethyl]-1,3,5-triazine-2,4-diamine]

   https://doi.org/10.1107/S2056989021002164  

   Ayodele, Mayokun J.; Green, Travis C.; Warsapperuma, W. A.; Forbes, Malcolm D.; Ostrowski, Alexis D. (March 2021, Acta Crystallographica Section E Crystallographic Communications)

   null (Ed.)

   The title compound, [Cu 2 (C 19 H 23 N 7 O)(C 2 H 3 O 2 ) 4 ] n , was obtained via reaction of copper(II) acetate with the coordinating ligand, 6-ethoxy- N 2 , N 4 -bis[2-(pyridin-2-yl)ethyl]-1,3,5-triazine-2,4-diamine. The crystallized product adopts the monoclinic P 2 1 / c space group. The metal core exhibits a paddle-wheel structure typical for dicopper tetraacetate units, with triazine and pyridyl nitrogen atoms from different ligands coordinating to the two axial positions of the paddle wheel in an asymmetric manner. This forms a coordination polymer with the segments of the polymer created by the c -glide of the P 2 1 / c setting of the space group. The resulting chains running along the c -axis direction are held together by intramolecular N—H...O hydrogen bonding. These chains are further packed by dispersion forces, producing an extended three-dimensional structure. 

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5. Syntheses and structures of dinuclear zinc(II) acetate-bridged coordination compounds with the aromatic Schiff base chelators N,N-dimethyl-2-[phenyl(pyridin-2-yl)methylidene]hydrazine-1-carbothioamide and N-ethyl-2-[phenyl(pyridin-2-yl)methylidene]hydrazine-1-carbothioamide

   https://doi.org/10.1107/S2056989025005407  

   Parry, Christian S; Abraham, Alex R; Kwofie, Samuel K; Wilson, Michael D; Ramadhar, Timothy R; Butcher, Raymond J (July 2025, Acta Crystallographica Section E Crystallographic Communications)

   In the centrosymmetric title complexes, di-μ-acetato-bis({N,N-dimethyl-2-[phenyl(pyridin-2-yl)methylidene]hydrazine-1-carbothioamidato}zinc(II)), [Zn₂(C₁₅H₁₅N₄S)₂(C₂H₃O₂)₂] (I), and di-μ-acetato-bis({N-ethyl-2-[phenyl(pyridin-2-yl)methylidene]hydrazine-1-carbothioamidato}zinc(II)), [Zn₂(C₁₆H₁₇N₄S)₂(C₂H₃O₂)₂] (II), the zinc ions are chelated by theN,N,S-tridentate ligands and bridged by pairs of acetate ions. The acetate ion in (I) is disordered over two orientations in a 0.756 (6):0.244 (6) ratio, leading to different zinc coordination modes for the major (5-coordinate) and minor (6-coordinate) disorder components. Geometrical indices [τ₅= 0.32 and 0.30 for (I) (major component) and (II), respectively] suggest the zinc coordination in these phases to be distorted square pyramidal. This study forms part of our aim to discern the mechanism of metal binding in these chelators, their specificity and selectivity, and to gain insight into the role of cellular zinc in physiological processes such as infection, immunity and cancer. 

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