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1. Comparison of Ce( iv )/Th( iv )-alkynyl complexes and observation of a trans -influence ligand series for Ce( iv )

   https://doi.org/10.1039/D5SC03222A  

   Yang, Qiaomu; Yu, Xiaojuan; Lapsheva, Ekaterina; Pandey, Pragati; Smith, Patrick W; Gupta, Himanshu; Gau, Michael R; Carroll, Patrick J; Minasian, Stefan G; Autschbach, Jochen; et al (August 2025, Chemical Science)

   Organometallic cerium(iv) and thorium(iv) alkynyl complexes were synthesized, and compared experimentally and theoretically. A cerium(iv)trans-influence ligand series was observed and analyzed. 

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2. Joint Analysis of H I Absorption Zeeman Measurements and the Morphology of Filamentary H I Emission

   https://doi.org/10.3847/1538-4357/adff52  

   Nowotka, Marta; Clark, Susan E; Burkhart, Blakesley; Fissel, Laura; Ching, Tao-Chung; Robishaw, Timothy; Heiles, Carl (October 2025, The Astrophysical Journal)

   Abstract We present a joint analysis of HIabsorption Zeeman measurements and the morphology of filamentary HIemission to investigate the 3D structure of the magnetic field in the diffuse neutral interstellar medium. Our analysis is based on the Arecibo Millennium Survey and new data from the Five-hundred-meter Aperture Spherical radio Telescope toward radio sources 3C 75, 3C 207, and 3C 409. Toward 3C 409, we make a 4σZeeman detection and inferB_LOS = 9.1 ± 1.9μG, in agreement with Arecibo results. We quantify the dispersion of HIfilaments at the locations and velocities of Zeeman components using GALFA-HInarrow-channel emission maps. Focusing on a subsample of 42 spectrally distinct components, we find a weak but statistically significant positive correlation (Spearmanρ= 0.3,p= 0.01) between ∣B_LOS∣ and the circular variance of HIfilament orientation angles. To examine its origin, we characterize the environments probed by HIabsorption using dust emission, 3D dust maps, OH absorption, and CO emission. We find evidence that existing HIabsorption Zeeman measurements trace magnetic fields that are coherent on parsec scales, probe primarily local gas (100–500 pc, often at distances consistent with the Local Bubble wall), and exhibit systematic differences in the magnitude ofB_LOS. We attribute the correlation between Zeeman measurements and filamentary HImorphology to large-scale variations in magnetic field strength and/or inclination angle across different Galactic environments, which could arise due to the Local Bubble geometry or enhanced total field strength in denser regions. 

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3. Generalized T _e ([O iii ])– T _e (He i ) Discrepancies in Ionized Nebulae: Possible Evidence of Case B Deviations and Temperature Inhomogeneities

   https://doi.org/10.3847/1538-4357/adc67a  

   Méndez-Delgado, J E; Skillman, E D; Aver, E; Morisset, C; Esteban, C; García-Rojas, J; Kreckel, K; Rogers, N_S J; Rosales-Ortega, F F; Arellano-Córdova, K Z; et al (June 2025, The Astrophysical Journal)

   Abstract The physics of recombination lines in the Heisinglet system is expected to be relatively simple, supported by accurate atomic models. We examine the intensities of Heisingletsλ3614, λ3965, λ5016, λ6678, and λ7281 and the triplet Heiλ5876 in various types of ionized nebulae and compare them with theoretical predictions to test the validity of the “Case B” recombination scenario and the assumption of thermal homogeneity. Our analysis includes 85 spectra from Galactic and extragalactic Hiiregions, 90 from star-forming galaxies, and 218 from planetary nebulae, all compiled by the Deep Spectra of Ionized Regions Database Extended (DESIRED-E) project. By evaluating the ratios Heiλ7281/λ6678 and Heiλ7281/λ5876, we determineT_e(Hei) and compare it with direct measurements ofT_e([Oiii]λ4363/λ5007). We find thatT_e(Hei) is systematically lower thanT_e([Oiii]) across most objects and nebula types. Additionally, we identify a correlation between the abundance discrepancy factor (ADF(O²⁺)) and the differenceT_e([Oiii]) –T_e(Hei) for planetary nebulae. We explore two potential explanations: photon loss fromn¹P → 1¹Stransitions and temperature inhomogeneities. Deviations from “Case B” may indicate photon absorption by Hirather than Heiand/or generalized ionizing photon escape, highlighting the need for detailed consideration of radiative transfer effects. If temperature inhomogeneities are widespread, identifying a common physical phenomenon affecting all ionized nebulae is crucial. Our results suggest that both scenarios can contribute to the observed discrepancies. 

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4. In silico screening of P , N -ligands facilitates optimization of Au( iii )-mediated S -arylation

   https://doi.org/10.1039/D4SC05920D  

   Treacy, Joseph W; Tilden, James_A R; Chao, Elaine Y; Fu, Zihuan; Spokoyny, Alexander M; Houk, K N; Maynard, Heather D (February 2025, Chemical Science)

   In silicoexamination of 13P,N-ligated Au(iii) OACs determined the key mechanistic factors governing Au(iii)-mediatedS-arylation. Three complexes were synthesized which exhibited bimolecular coordination rate constants as high as 20 200 M⁻¹s⁻¹. 

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5. Synthesis and cytotoxicity studies of Cu( i ) and Ag( i ) complexes based on sterically hindered β-diketonates with different degrees of fluorination

   https://doi.org/10.1039/d3dt02179c  

   Pellei, Maura; Del_Gobbo, Jo’; Caviglia, Miriam; Karade, Deepika V; Gandin, Valentina; Marzano, Cristina; Noonikara_Poyil, Anurag; Dias, H_V Rasika; Santini, Carlo (August 2023, Dalton Transactions)

   New Cu(i) and Ag(i) phosphane complexes supported by β-diketonate ligands were synthesized and evaluated for their antitumor activity by 2D and 3D cell viability studies. 

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